16 ECHTNODERMA. 



Order 2. PNETJMONOPHOBA. 



Pedataj, Brandt, Prodr. descr. (1835) p. 42. 

 Holothuridea, Van der Hoeven, Zool. i. (1850) p. 147. 

 Eupodia+Liodemiatidoe, Bronn, Klass. u. Ordn. (1860) p. 403. 

 2 e Tribu, Holothuriens, JDuj. $ Hup. Ech. (1862) p. 616. 

 Apneumona Pedata+Pneumonophora, Cams, Zool. ii. (1863) p. 494. 

 Pedata+Apoda pneumonophora, Claw, Zool. (1880) p. 373 ; Lamport, 

 See waken, (1885) pp. 16 & 21 ; Theel, Chall, Hep. (1886) pp. 48 & 57. 

 Actinopoda, Ludioig, Klass. u. Ordn. (1891) p. 327. 



Holothurioidea with respiratory trees, and with (Pedata) or with- 

 out podia ; the latter are not known as British. 

 Two families. 



Family 1. DENDROCHIROT./E. 



Dendrochirotse, Brandt, Prodr. descr. (1835) p. 57 ; Grube (sens, 

 emend.), Act. etc. Mittelm, (1840) p. 33; Selenka, Zeit. tviss. Zool. xvii. 

 (1867) p. 341 ; Semper, Hoi, (1868) p. 47 ; Lampert, Seewaiz. (1885) 

 p. 17; Theel, Chall. Pep. (1886) p. 99; Ludwig, Klass. u. Ordn. 

 (1891) p. 342. 



Pedate Holothurians in which the tentacles are dendritic and 

 the pharynx is provided with special retractor muscles. 



(a) Decachirote Dendrochirotse. 

 Bell, P. Z. S. 1884, p. 254. 



Dendrochirotae in which there are five pairs of tentacles. 

 Three genera : Cucumaria, Tliyone, Psoitis. 



(b) Polychirote Dendrochirotae. 

 Bell, P. Z. S. 1884, p. 254. 



Dendrochirotae, in which there are more than five pairs of ten- 

 tacles. 



One genus : Plujllophorus. 



Family 2. ASPIDOCHIROT.E. 



Aspidochirotre, Brandt, Prodr. descr. An. (1835) p. 53; Grube (sens, 

 emend.), Act. etc. Mittelm. (1840) p. 33 ; Selenka, Zeitschr. f. wiss. 

 Zool. xvii. (1867) p. 309; Semper, Phil. Hoi. (1868) p. 40 ; Lampert, 

 Sceivalzen, (1885) p. 16; Theel, Chall, Rep. Hoi. (1886) p. 188 

 Ludioig, Klass. u. Ordn. (1891) p. 327. 



Pedate Holothurians in which the tentacles are shield-shaped, 

 and no special retractors of the pharynx are developed. 

 One genus : Holothuria, 



