A treatise on zoology . this group during the later part of the eighteenth century. In 181G Tiedcmann pu])lishcd an excellent account of theanatomy of Jlolotharia tubulosa, Gmel. (12), and since then thestudy of the structure, development, and classification of the classhas been greatly extended by a large numl)er of naturalists, amongstwhom one may mention A. Baur (1), Selenka (7), Semper (10), , MetschnikotV, and Kowalevsky. Within recent years thefiner anatomy and histology of Holothurians have been studied byO. Hamann (3), Ibrouard (4), Cutiiot, and many others, and theiroml)ryol
A treatise on zoology . this group during the later part of the eighteenth century. In 181G Tiedcmann pu])lishcd an excellent account of theanatomy of Jlolotharia tubulosa, Gmel. (12), and since then thestudy of the structure, development, and classification of the classhas been greatly extended by a large numl)er of naturalists, amongstwhom one may mention A. Baur (1), Selenka (7), Semper (10), , MetschnikotV, and Kowalevsky. Within recent years thefiner anatomy and histology of Holothurians have been studied byO. Hamann (3), Ibrouard (4), Cutiiot, and many others, and theiroml)ryology by Selenka (7), Semon (9), and Bury (2). Ourknowledge of that most interesting group, the l^lpiiliidae, datesalmost entirely from the publication by Th(cl of the Report onthe collections made duiiiig the Challenger Expedition (11). Thefamily Pelagotluuiidae has only lately l)een described by II.[judwig (6). An admirable and comprehensive treatise on the » By E. S. Goodricli, THE HOLOTHURIOIDEA 219 t br B§. Fig. I. 1.—Holothuria forskali, D. Ch., opened along the right side of the median dorsal line;the blood-vascular system is not represented ; 2.—Left side view ; and 3.—Anterior view. 4.—Calcareous ring of H. forslccli; the anterior ends are turned inwards. 5.—Diagram of the water-vascular system of H. forskaU, illustrating the Actinopod jdan. G.—Larva of a Holothurian. (After Balfour.) 7.—Axiricidarialaxx^; and 8.—Barrel-shaped larva of Synapta digitata. (Both after Senion ; cf. Chapter VIIL, Figs. IIL & XVII.) 9.—Portion of the intestine with the accompanying blood-vessels and rete mirabile ofHolothuria tuhulosa. (After Tiedemann.) 10.—Left side view of Ankyroderma affiiic, Dan. and Kor.; and 11.—Spicules of the same. (After Danielssen and Koren.) ft, anus; on, anchor ; a. i, anti-mesenterial blood-vessel; 6/-, brim ; ^, ciliated band; ,circular water-vascular canal; cl, rectal cloaca ; , Cuvierian organs ; , collateral blood-v
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
