32 HOLOTHURIOIDEA. 



II. SPECIAL PART. 



Descriptions of the Genera and Species of British Echino- 

 derma, with an account of their synonymy and geo- 

 graphical distribution, together with some notes on their 

 habits. 



HOLOTHUKIOIDEA (see p. 14). 



Key to the Genera of Holothurioidea. 



A. Without podia 1- Synapta, p. 32. 



B. With podia. 



I. Tentacles arborescent. 



A. Tentacles ten. 



1. The podia in rows along the ambu- 



lacra, even if scattered on the inter- 

 ambulacra also 2. Cucumakia, p. 35. 



2. The podia scattered 3. Thyone, p. 41. 



3. The podia confined to the trivium, 



which forms a flat sole 4. Psoltjs, p. 44. 



B. Tentacles more than ten. [p. 46. 



Tentacles fifteen 5. Phyllophorus, 



II. Tentacles shield-shaped. 



1. No C-shaped spicules 6. Holothuria, p. 48. 



2. With C-shaped spicules 7. Stichopus, p. 51. 



1. SYNAPTA. 



Svnapta, Eschscholtz, Zool. Atlas, (1829) ii. p. 12 ; Dub. $ Kor. Vet. 



Akad. lldlg. 1844 (1846) p. 322 ; Duj. 8f Hup. Ech. (1862) p. 614 ; 



Selenka, Zeit. f. iviss. Zool. xvii. (1867) p. 360 ; Semper, Phil. Hoi. 



(1868) p. 9; Lampert, Seetcalzen, (1885) p. 22; Theel, Chall. Rep. 



Hoi (1886) p. 18; Ludivi(/,Kl«ss. u. Ordn. (1891) p. 357. 

 Fistularia, Forskal, Descr. Anim. (1775) p. 121 (pars). 

 Mulleria, Fleming, Brit. An. (1S28) p. 484. 

 Tiedemannia, Leuckart, Ms, xxiii. (1830) col. 685 f.n. 

 Oncinolabes, Brandt, Prodr. descr. (1835) p. 48; Ludwiff, Zeits. f. wiss. 



Zool. xxxv. (1881) p. 576. 

 Dactylota, Brandt, op. cit. p. 45. 

 Chirodota, Forbes, Brit. Star/. (1841) p. 239. 



Leptosynapta, Verrill, Trans. Connect. Acad. i. (1867[71J) p. 325 f.n. 

 Heterosynapta, id. op. cit. p. 346 f.n. 



Tentacles ten to twenty-five ; deposits anchors, anchor-plates, and 

 fine granules ; hermaphrodite. 



