26 ECHINODERMA. ~ 
II. With dental papille. 
A. With oral papille. 
Family 3. OPHIOCOMID A. 
Ophiocomide, 7d. t. c. p. 328. 
Spines smooth or covered with skin, disk granulated. 
Two genera: Ophiocoma and Ophiopsila. 
B. Without oral papille. 
Family 4. OPHIOTHRICIDA. 
Ophiothricide, zd. ¢. c. p. 380. 
Spines roughened or serrated, disk generally with spines or 
spiniform rods. 
One genus: Ophiothria. 
Order 2. STREPTOPHIUR A. 
Streptophiure, Bell, P. Z. S. 1892, p. 179. 
Ophiuree (auct.), pars. 
Ophiuroids in which the faces of the arm-ossicles have no pits or 
processes sufficient to prevent the ossicles being so twisted on their 
neighbours that the arms may be coiled or rolled towards the mouth. 
Of the covering-plates, tentacle-scales, teeth, teeth-papille, mouth- 
papilla, several may be absent. A single madreporite. No pedicel- 
lari. Arms never branch. 
Three genera: Ophioscolew, Ophiobyrsa, and Ophiomyxa. 
Order 3. CLADOPHIURA. 
Euryalide, Gray, Syn. B. M. 42nd ed. (1840) p. 68. 
Euryale, M. Tr. Syst. Ast. (1842) p. 85. 
Asterophydées, Duy. §& Hup. Echin. (1862) p. 295. 
Astrophytonide, Norman, Ann. § Mag. xv. (1865) p. 104. 
Asterophydie, Wright, Brit. Foss. Echin. Oolit. ii. (1866) p. 188. 
Phytastra, Haeckel, Gen. Morph. ii. (1866) p. Ixvii. 
Astrophytide, Lyman *, Chall. Rep. (1882) p. 250. 
Cladophiure, Bell, P. Z. S. 1892, p. 180. 
Ophiuroidea with more or less saddle-shaped faces to the arm- 
* Astrophytids is to be found passim in the works of Mr. Lyman, but does 
not seem to have been defined by him till 1882. 
