CLASSIFICATION. 41 



2. AsTKOPECTEN, Liiick. — Ambulacral spines siin[)le, linear, without any tesserae between 



the marginal tubercles near the mouth and angles of the arms. A. corniculatus, 

 Linck., Stcl. Mar., t. 27 and 36. 



3. LuiDiA, Forb. — Margin of the flat rays erect; dorsal surface crowded with regular 



paxilla). L. fragillissima, Forbes, Brit. Star-fishes, p. 135. 



4. Petalaster, Gr. — ]\Iargin of the rays shelving ; dorsal surface with equal paxillac 



placed in longitudinal and transverse series. Asiatic, P. Ilardwickii, Gr.,Brit. Mus. 



5. Solaster, Forb. — Rays many, with two series of broad spines bearing tubercles near 



the ambidacra. S.jjopposa, Forb., Brit. Star-fishes, p. 112. 



6. Henricia, Gr. — Rays five , rounded, tapering, with rounded tubercles near the ambu- 



lacra ; the dorsal wart obscure, concealed by spines. H. oculata, Penn. 



Family 3. — Pentaceuotid/E. 



The body supported by roundish or elongated pieces, covered with a smooth or 

 granular skin, pierced with minute pores between the tubercles. 



1. CuLCiTA, Ag. — Type, Asterias Schmideliana, Retz., Naturforscher., xvi, t. 1. 



2. Pentaceros, Linck. — Body convex above, margin with two rows of large spine- 



bearing tesserae. P. gihhiis, Linck., Stel. Mar., t. 23, fig. 36. 



3. Stellaster, Gr. — Body depressed, covered with large, flat, regular six-sided plates ; 



margin with two rows of large tesserae ; the lower rows with a series of compressed 

 mobile spines. S. Childreni, Gr., fig. 10. 



4. CoMPTONiA, Gr. — Body depressed, spinose? dorsal and oral disc covered with very 



small, flat plates ; marginal ossicula large, without any mobile spines. 

 C. elegans, Dixons, Fossils of Sussex, t. 22, fig. 9. 



5. Gymnasteria, Gr. — Type, G. spinosa, Gr., Brit. Mus. 



6. Paulia, Gr.— Body five-rayed, formed of flat, granulated, spine-bearing, irregular 



ossicula on the disc aud margin, without any two-lipped i)ores. P. horrida, Gr,, 

 Brit. Mus. 



7. Randasia, Gr.— Body pentagonal, with a tubercular skin above, and large granular 



plates beneath and on the margin, without any two-lipped slits, but with one or 



6 



