182 



Mr. J. E. Gray's Synopsis of 



**** The upper series of marginal tubercles with 2 series of spines 

 at the base and 1 along the edge of the arms. 



11. Astropecten erinaceus, Gray. Arms gradually tapering, twice 

 as long as the width of the body ; upper marginal tubercles rather 

 narrow, with a series of small short spines, and a series of 6 or 8 

 larger ones. 



" St. Elena, sandy mud, 6 fathoms." H. Cuming, Esq. 

 ft The under or oral series of marginal tubercles rounded and not 

 produced beyond the dorsal ones. 



* The upper series with a series of short spines. 



12. Astropecten Mauritianus, Gray. Rays broad; lower spines 

 broad, strap-shaped. 



Inhab. Isle of France. 

 ** Upper series spineless. 



13. Astropecten mesodiscus, Linck, 29. t. 4. f. 16. Rays elongate, 

 slender, tapering ; upper marginal tubercles narrow, with 2 series of 

 short small tubercles like granules, one on each of the margins ; 

 lower spines broad, elongate. 



Inhab. . 



14. Astropecten gracilis, Gray. Rays elongate, slender, gradually 

 tapering ; upper marginal plates rather broad, granular with fine 

 spines on the suture between them ; lower spines small, blunt, de- 

 pressed. 



Inhab. . Like the former, but arms narrower. 



15. Astropecten irregularis, Linck, 27. t. 6. f. 13. A. aurantiaca, 

 Muller, Z. D. t. 83. A. Johnstoni, Chiaje ? Rays rather broad, 

 tapering ; the upper tubercles rather broad, with a series of 1 or 2 

 scattered tubercular spines near the tip ; lower spines depressed, 

 acute. 



Inhab. Pembrokeshire, Linck. 



16. Astropecten dubius. Rays broad, tapering; upper marginal 

 tubercles rather broad, granular, spineless ? lower spines broad, de- 

 pressed. 



Inhab. West Indies. 



*** Upper and lower margin spineless, serrated ? 



17. Astropecten regularis, Linck, 26. t. 8. f. 11. Asterias petalo- 

 dea, Retz, Aster. 16. n. 14 ? 



Inhab. . I have never seen this species. 



3. Body brayed, the arms high, narrow ; upper marginal tubercles 

 very narrow and erect ; the line of dorsal tubercles down the centre of 

 the arms the largest. Astropus, Gray. 



18. Astropecten longipes, Gray. Rays long and narrow; the up- 

 per marginal tubercles minutely granular, and 1 or 2 of them often 

 furnished with a short broad conical spine ; lower with a broad de- 

 pressed blunt erect adpressed spine ; monstrosity 4-rayed. 



Inhab. "Isle of France," Leach. 



