the Genera and Species of Starfish. 



277 



7. Pentaceros Franklinii. Rays elongate, as long as the width of 

 the body, with a dorsal series of broad blunt tubercles ; back high, 

 with very large spines at each angle, margin not armed. 



Var. 1. With one or two conical tubercles on each side of the tu- 

 bercles, near the one at the angle of the central dorsal disk. 



Inhab. Coast of New Holland. G. Bennett, Esq. 



See also Pentaceros turritus, Linck, t. 22. 23. f. 3. Like the 

 former, but the back is more spinose, and the spines are not so large. 



8. Pentaceros muricatus, Linck, t. 7. f. 8. Ast. Linckii, Blainv. A. 

 nodosa, Lam. Seba, iii. t. 7. f. 3. Arms elongated, nearly as long as 

 the width of the body, with a dorsal series of large, and with 2 or 

 3 large conical spines near the tips ; back rather high, spinose. 



Inhab. . Brit. Mus. 



b. Back formed of irregular flat-topped ossicula, placed in rows so 

 as to appear nearly tessellated ; arms elongated, rather narrow. 



9. Pentaceros nodosa. Asterias nodosa, Gmelin (part), Seba, iii. 

 t. 8. f. 11, 12. (t. 5. f. 11, 12. without spines on the margin ?) Arms 

 with a double series of hemispherical tubercles ; back rather depressed ; 

 marginal ossicula unequal, lower one with small blunt conical spines. 



Inhab. Isle of France. W. E. Leach, M.D. 



c. Back formed of regular rounded ossicula, placed in rows • back 

 rather low. 



10. Pentaceros aculeatus, Seba, iii. t. 5. f. 5. 6. With 3 ridges of 

 small spine-bearing tubercles ; back rather depressed, with three 

 small spines at the angles ; marginal ossicules rounded, with conical 

 tubercles. 



Var. ? or younger ? Spine-bearing ossicula further apart, with the 

 skin and granulations worn off and bleached, Seba, iii. t. 7. f. 1. 



Inhab. West Indies, St. Vincent's. Rev. L. Guilding. 



See also Pentaceros spinosa. Ast. nodosa (part), Gmel. Seba, iii. 

 t. 5. f. 7, 8., and var. Seba, iii. t. 7. f. 1, 2. Ossicula oblong, with 

 2 or 3 small conical tubercles. 



d. Back regularly convex, formed of flat granular ossicula with a 

 blunt mobile spine on the centre of each ossicule below ; arms short, 

 broad. Nidorellia. 



11. Pentaceros armatus, Gray. Arms short, broad, the lower mar- 

 ginal and the 3 last upper marginal plates at the top with short 

 blunt spines ; back convex, with central and lateral groups and a se- 

 ries of spines down each arm. Young more convex ; spines shorter, 

 blunter and fewer. Younger not so convex, without any marginal 

 spines, and only indications of them on the back. 



Inhab. Punta Santa Elena. Rock ground, 12 to 15 fathoms. 

 H. Cuming, Esq. 



3. Stell aster. Gray. 



Body depressed, covered with large flat regular six-sided plates, 

 margin with 2 rows of large tesserae ; the lower rows with a series 

 of compressed mobile spines. 



