16 ECHINODERMA. 
Order 2. PNEUMONOPHORA. 
Pedatx, Brandt, Prodr. descr. (1835) p. 42. Z 
Holothuridea, Van der Hoeven, Zool. 1. (1850) p. 147. 
Eupodia + Liodermatide, Bronn, Klass. u. Ordn. (1860) p. 403. 
2¢ Tribu, Holothuriens, Duy. § Hup. Ech. (1862) p. 616. 
Apneumona Pedata+Pneumonophora, Carus, Zool. ii. (1863) p. 494. 
Pedata+-Apoda pneumonophora, Claus, Zool. (1880) p. 373; Lampert, 
Seewalzen, (1885) pp. 16 & 21; Théel, Chall. Rep. (1886) pp. 48 & 57. 
Actinopoda, Ludwig, 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. 
Dendrochirote, Brandt, Prodr. descr, (1835) p. 57; Grube (sens. 
emend.), Act. etc. Mittelm. (1840) p. 33; Selenka, Zeit. wiss. Zool. xvii. 
(1867) p. 341; Semper, Hol. (1868) p. 47 ; Lampert, Seewalz. (1885) 
p- 17; Théel, Chall. Rep. (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 Dendrochirote. 
Bell, P. Z. 8. 1884, p. 254. 
Dendrochirotz in which there are five pairs of tentacles. 
Three genera: Cucumaria, Thyone, Psolus. 
(>) Polychirote Dendrochirote. 
Bell, P. Z, 8S. 1884, p. 254. 
Dendrochirot, in which there are more than five pairs of ten- 
tacles. | 
One genus: Phyllophorus. < 
Family 2. ASPIDOCHIROTA. 
Aspidochirote, 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. Hol. (1868) p. 40 ; Lampert, 
Seewalzen, (1885) p. 16; Théel, Chall. Rep. Hol. (1886) p. 188 
Ludwig, 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. 
