30 JOURNAL OF SCIENCE. 
THE GENERA OF HOLOTHURIDEA. 
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(Translated from Dr. C. Semper’s ‘‘ Reisen im Archipelder Philippinen (Holo- 
thurien),”” by Professor F, W. Hutton.) 
ORDER I.—APEUMONA. 
No respiratory tree nor proper cloaca ; ambulacral system 
wanting. Tentacles lineal, feathered, or digitate. 
Family I.—Synaptide. 
Tentacles feathered, or digitate. No radiating vessels in the 
skin. Bands of peduncled, ciliated, cups on the mesentery. 
Calcareous dermal plates in the form of anchors or wheels, very 
different from other Holothurians. 
Genus Syzapta.—Vermiform, with anchors in the skin, and 
10 to 25 digitate or feathered tentacles. 
Genus Avxapta—Vermiform, thin. Tentacles small, finely 
feathered. Closely covered with fine papilla. Entirely without 
wheels or anchors. 
Genus Chirodota—Vermiform. Tentacles scutiform or digi- 
tate. Papille in the skin, with wheel-like plates. 
Genus Syzaptula—Like Synapta, but viviparous. 
Genus Myriotrochus—Skin smooth, with large, stalked, 
simple wheel-plates, which are not, as in chzrodota, in groups in 
a bladder. 
Genus Rhabdomolgus.—Ten ciliated tentacles. No calcareous 
plates. Pelagic? | 
Family [1 —Eupyrgide. 
No feet. Closely covered with calcareous scales. Fifteen 
simply digitate tentacles. 
Genus Lupyrgus.—Characters of the family. 
Family I1I1.—Oncinolabide. 
Like Synaptidz, but with small feet. 
Genus Oncinolabes—Characters of family. 
ORDER I].—PNEUMONOPHORA. 
A respiratory tree opening into the cloaca. 
Family [—Molpadide. 
No feet. With or without water-vessels in the skin. Ten- 
tacles cylindrical, digitate, or scutiform. 
Genus Haplodactyla—Tentacles 15 or 16, cylindrical; skin 
smooth. 
Genus Molpadia.—Tentacles 12 to 15, digitate at the end. 
