32 HOLOTHURIOIDEA. 
I]. 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. 
HOLOTHURIOIDEA (see p. 14). 
Key to the Genera of Holothurioidea. 
A Watoutpodian y.is secu oe cates iene sale 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- 
A ULACTH, WSO) etererercn efe suetpeverene eve 2. CUCUMARIA, p. 35. 
2; ‘The podia scattered, ...5.-..-...-. 5. THYONE, p. 41. 
3. The podia confined to the trivium, é 
which forms a flat sole .......... 4, Psouvs, p. 44. 
B. Tentacles more than ten. [p. 46. 
Mentaclesviiteens. clic. cea /esise etter: 5, PHYLLOPHORUS, 
Il. Tentacles shield-shaped. 
1.. No C-shaped spicules..............6. 6. HoLotHurRta, p. 48. 
9, With C-shaped spicules.............. 7. SricHopwus, p. 51. 
1. SYNAPTA. 
Synapta, Eschseholtz, Zool. Atlas, (1829) ii. p. 12; Diid. § Kor. Vet. 
Akad. Hdlg. 1844 (1846) p. 822; Duy. § Hup. Ech. (1862) p. 614; 
Selenka, Zeit. f. wiss. Zool. xvii. (1867) p. 860; Semper, Phil. Hol. 
(1868) p. 9; Lampert, Seewalzen, (1885) p. 22; Théel, Chall. Rep. 
Hol. (1886) p. 18; Ludwig, Klass. u. Ordn. (1891) p. 357. 
Fistularia, Morskal, Descr. Anim. (1775) p. 121 (pars). 
Mulleria, Fleming, Brit. An. (1828) p. 484. 
Tiedemannia, Leuckart, Isis, xxiii. (1830) col. 685 fn. 
Oncinolabes, Brandt, Prodr. descr. (1835) p. 48; Ludwig, Zeits. f. wiss. 
Zool. xxxv. (1881) p. 576. 
Dactylota, Brandt, op. cit. p. 45. 
Chirodota, Forbes, Brit. Starf. (1841) p. 259. 
Leptosynapta, Verrill, Trans. Connect. Acad. i. (1867[71]) p. 325 fn. 
Heterosynapta, zd. op. cit. p. 846 fn. 
Tentacles ten to twenty-five ; deposits anchors, anchor-plates, and 
fine granules; hermaphrodite. 
