14 ECHINODERMA. 



Stage j3. Actinogonidiata. 



1st Subbranch. STATOZOA. 

 Substage i. Apelmatozoic. 



Class 3. PSome Cystidea. 

 Class 4. PSorne Blastoidea. 

 Class 5. PSome Crinoidea. 



Sabotage ii. Pelmatozoic. 



Class 6. Some Cystidea. 

 Class 7. Blastoide v (s. ».)• 

 Class 8. Crixoidea (s. s.). 





2nd Subbranch. ELEUTHEROZOA. 

 Division i. Azyyopod (Lissactinic). 



a. With open ambulacra. 



Class 9. Asteroidea. 

 (i. With (in most) a ventral arm-ossicle 



Class 10. Ophiuroidea. 

 Division ii. Zyyopud (Desmactinic). 



Class 11. Echinoidea. 



Branch A. INC ALICU L AT A. 



Incaliculata, Bell, Ann. $ May. viii. (1891) p. 212. 



Echinoderma in which no system of plates set alternately along 

 and between the rays is developed in the aboral region. 



Stage a. Anactinogonidiata. 



Anactinogonidiata, Bell, Ann, ty May. viii. (1891) p. 212. 



Echinoderma in which the vascular and nervous, but not the 

 digestive or reproductive, systems exhibit quinqueradiate symmetry. 



Class 1. HOLOTHURIOIDEA. 



Holothuria, Linn. Syst. Nat. xii. (1767) p. 1089 (pars) ; de Bl. Diet, 



Sci. Nat. xxi. (1821) p. 310. 

 Les Fistulides, Lamk. Syst. An. s. Vert. (1801) p. 351 (pai's). 

 Les Holothuries, Cue. lik/ne An. iv. (1817) p. 20. 

 Fistulida, Macleay, Hor. Entom. (1819) p. 316: Gray, Ann. Phil. x. 



(1825) p. 423. " 

 Fistulata, Eiehwald, Zuol. Siwc. i. (1829) p. 232. 

 Holothurides, de Bl. Actin. (1834) p. 188; Duj.fyHup. Echin. (1862) 



p. 609. 

 Holotburina, Brandt, Prod, descr. (1835) p. 42. 

 Fistulides on Holothuries, Ay. Mem. Soc. Neuch. i. (1836) p. 180. 



