22 ECHINODEltMA. 



Family 6. ASTERINID^. 



Asterinidse, Gray, Syn. B. M. 42nd ed. (1840) p. 62 ; id. Ann. $ Mag. 

 vi. (1840) p. 2*88 ; id. Brit. Bad. (1848) p. 21 ; Perrier (sens. emend.). 

 Arch. Zool. exper. iv. (1875) p. 301 ; Viguier (sens, emend.), Arch. 

 Zool. exper. vii. (1878) p. 205; Perrier, Nouv. Arch. vi. (1884) 

 p. 219 ; Sladen, ChctU. Bep. Ast. (1889) p. xxxiii. 



The Asterinidse are phanerozonate Asteroidea with small marginal 

 plates in which the abactiiial skeletal plates are imbricated and 

 carry spines on their free edge, or are irregularly rounded and bear 

 tufts of spinelets. 



Two genera : Asterhia and Palmipes. 



Order 2. CRYPTOZONIA. 



Cryptozonia, Sladen, ChaU. Bep. Ast. (1889) p. xxxiv. 



Asteroidea with reduced or obsolete marginal plates ; when 

 present the upper and lower rows do not touch, and their axes are 

 not in parallel planes. Papulae not confined to the area bounded 

 by the superomarginals. Ambulacral plates more or less crowded 

 and narrow. Adambulacral plates may or may not take a pro- 

 minent share in the formation of the mouth-plates. Pedicellariao 

 foraminate in Linckiidee only. 



Family 1. STICHASTERID^E. 



Stichasteridre, Perr. Ann. Sci. Nat. xix. (1885) art. 8, p. 15. 



Cryptozonate Asteroids with major or minor pedicellarise or both ; 

 ambulacral tubes quadriserial at base of arms at least ; skeleton of 

 arms well developed, the ossicles arranged in regular longitudinal 

 rows and imbricating. 



Three genera : Stiehaster, Neomorphaster, and Zoroaster. 



Family 2. SOLASTERID^E. 



Solasteridse, Perrier, Nouv. Arch. Mus. (2) vi. (1884) p. 210; Sladen, 

 ChaU. Bep. Ast. (1889) p. xxxvi. 



The marginal plates more or less obscured, the abactinal skeleton 

 more or less loosely reticulate, with the spines on its plates arranged 

 in paxilliform groups. 



One genus : Solaster. 



