Excerpt: ...is presented by the Hyperinae which usually live upon Acalephae. In these the young and adults often have a remarkably different appearance; but even in these there is no new formation of body-segments and limbs, but only a gradual transformation of these parts. ( In the young of Hyperia galba Spence Bate did not find any of the abdominal feet, or the last two pairs of thoracic feet, but this very remarkable statement required confirmation the more because he examined these minute animals only in the dried state ...
Read More
Excerpt: ...is presented by the Hyperinae which usually live upon Acalephae. In these the young and adults often have a remarkably different appearance; but even in these there is no new formation of body-segments and limbs, but only a gradual transformation of these parts. ( In the young of Hyperia galba Spence Bate did not find any of the abdominal feet, or the last two pairs of thoracic feet, but this very remarkable statement required confirmation the more because he examined these minute animals only in the dried state. Subsequently I had the wished-for opportunity of tracing the development of a Hyperia which is not uncommon upon Ctenophora, especially Beroe gilva, Eschsch. The youngest larva from the brood-pouch of the mother already possess THE WHOLE of the thoracic feet; on the other hand, like Spence Bate, I cannot find those of the abdomen. At first simple enough, all these feet soon become converted, like the anterior feet, into richly denticulated prehensile feet, and indeed of three different forms, the anterior feet (Figure 44) the two following pairs (Figure 45) and finally the three last pairs (Figure 46) being similarly constructed and different from the rest. In this form the feet remain for a very long time, whilst the abdominal appendages grow into powerful natatory organs, and the eyes, which at first seemed to me to be wanting, into large hemispheres. In the transition to the form of the adult animal the last three pairs of feet (Figure 49) especially undergo a considerable change. The difference between the two sexes is considerable; the females are distinguished by a very broad thorax, and the males (Lestrigonus) by very long antennae, of which the anterior bear an unusual abundance of olfactory filaments. Their youngest larvae of course cannot swim; they are helpless little animals which firmly cling especially to the swimming laminae of their host; the adult Hyperiae, which are not unfrequently met with free in the sea, are, as is...
Read Less
Add this copy of Facts and Arguments for Darwin to cart. $37.63, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2022 by Legare Street Press.
Add this copy of Facts and Arguments for Darwin to cart. $40.79, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2021 by Alpha Edition.
Add this copy of Facts and Arguments for Darwin to cart. $41.63, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2010 by Kessinger Publishing.
Add this copy of Facts and Arguments for Darwin to cart. $41.63, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2004 by Kessinger Publishing.
Add this copy of Facts and Arguments for Darwin to cart. $44.22, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2016 by hansebooks.
Add this copy of Facts and Arguments for Darwin to cart. $45.62, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2007 by BiblioBazaar.
Add this copy of Facts and Arguments for Darwin to cart. $46.96, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2007 by BiblioBazaar.
Add this copy of Facts and Arguments for Darwin to cart. $49.15, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2011 by Tredition Classics.
Add this copy of Facts and Arguments for Darwin to cart. $122.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2003 by IndyPublish.
Add this copy of Facts and Arguments for Darwin to cart. $450.00, very good condition, Sold by Avon Hill Books rated 4.0 out of 5 stars, ships from Cambridge, MA, UNITED STATES, published 1869 by John Murray.
Choose your shipping method in Checkout. Costs may vary based on destination.
Seller's Description:
Very Good-with No dust jacket as issued. Book has two dampstains. One is to back cover, which shows a stain and also results in some puckering along the inside edge of the back cover as well as the rear free endpaper. The other stain is to the inside of the front cover (endpaper), and a ghost of that on the front free endpaper. Neither stain affects the text of the book. Otherwise ther eis some soiling to the edges of the pages, and a small amount of rubbing along fold of spine. Light bumps to corner points. Some toning to paper.; In English. Clean and tight.; 8vo 8"-9" tall; 144 pp.
