. A manual of zoology. Zoology. V. HOLOTIIUROIDEA. 319 The regenerative powers of these animals are of interest. In unfavor- able conditions (hence in preserving the animals in alcohol without nar- cotization with chloral) they void the whole viscera and yet may live and reproduce the lost parts. In certain species are found a few parasites. Oae or two harbor a small fish {Fierasfer) in their cloaca and branchial trees. A parasitic snail, Entoconcha mirdbiUs, lives in one species of Sijnapta, and a mussel, Entovalva mirabUis, in another. Order I. Actinopoda. Radial canals present, sending bran
. A manual of zoology. Zoology. V. HOLOTIIUROIDEA. 319 The regenerative powers of these animals are of interest. In unfavor- able conditions (hence in preserving the animals in alcohol without nar- cotization with chloral) they void the whole viscera and yet may live and reproduce the lost parts. In certain species are found a few parasites. Oae or two harbor a small fish {Fierasfer) in their cloaca and branchial trees. A parasitic snail, Entoconcha mirdbiUs, lives in one species of Sijnapta, and a mussel, Entovalva mirabUis, in another. Order I. Actinopoda. Radial canals present, sending branches to the tentacles and am- bulacra when present. Divided into Pedata, with ambulacra, and Apoda, without. The PEDATA include the Holothuridfe with peltate tentacles. ^3 X. Fio. 338.—Ci(cni7iai-ia frondosa, sea cucumber. (From Emerton.) Eolotlturia* in warmer waters, one species the trepang of Chinese markets. The Cucdmariid/e represented in our waters by Cucu- maria* {Pentacta) with regular rows of ambulacra, Thyone* with them scattered, and Psolus* scaly with a creeping disc. The deep-sea Ela- siPODA belong to the Pedata. The APODA are represented by Gaudina* (fig. 336) and Molpadia.* Order II. Paractinopoda. No radial canals nor ambulacra. Tentacular canals arising from ring canal. Mijriotrochus* Syrmpta* Oligoti-odais* (iig. 339).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
Size: 1317px × 1897px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
