the Genera and Species of Starfish. 181 



2. Body 5-rayed, arms depressed; the upper series of marginal 

 tubercles broad, rounded or shelving towards the edge. 



a. The dorsal tubercles between the angles of the arms on the centre 

 of the back and on the lines down the centre of the arms the largest. 



3. Astropecten stellaris. QsyI/v^' 



Inhab. . 



b. The dorsal tubercles subequal, with fasciculated spines. 



f The oral series of marginal tubercles produced beyond the dorsal 

 ones. 



* The upper marginal tubercles with a single series of spines at the 

 angle of the base of the rays, and with another series at the end of the 

 rays, which together make a double series near the base of the rays. 



4. Astropecten duplicatus, Gray. Rays three times as long as the i 

 diameter of the body, slender ; marginal spines elongated, depressed, ^V 

 linear. 



Inhab. St. Vincent's. Rev. L. Guilding. 



5. Astropecten aurantiacus. Asterias aurantiaca, Linn. Rays three 



times as long as the diameter of the body, slender ; marginal spines 

 subulate, elongated. 



Inhab. Mediterranean. 



6. Astropecten stellatus, Gray. Rays more than twice as long as the 

 width of the body. The central area of the arms is about as wide 

 as one series of the marginal tubercles. 



Inhab. Coast of South America ? 



** The upper series of marginal tubercles with a continued single 

 series of spines on the angle of the arms. 



7. Astropecten armatus, Gray. Rays elongate, regularly tapering ; — * 

 upper marginal tubercles narrow, with a continued series of erect, 

 elongated, subulate spines. Var. 2. Pule her, the under series of 

 marginal tubercles not produced, and the spines more slender. 



Inhab. Puerto Portrero, South America, on sandy bottoms, 9 fa- 

 thoms. H. Cuming, Esq. Var. 2. 



8. Astropecten echinatus, Linck, 29. t. 8. f. 12. 12. Rays rather 

 more than twice as long as the width of the body ; upper series of 

 spines large, lower series depressed, acute. . 



See also Astropecten bispinosa = Asterias bispinosa, Otto. — ,..» ^ . — [■ ( 

 *** The upper series of marginal tubercles spineless, the lower se- 

 ries much produced. 



9. Astropecten marginatus, Gray. Rays nearly three times as long 

 as the width of the body ; lower marginal tubercles linear, depressed. 



Astropecten fimbriatus, Linck, is probably this species with the 

 marginal spines lost. 



10. Astropecten regalis, Gray. Rays one-fourth longer than the 

 diameter of the body, broad, tapering ; spines broad, blunt, depressed. 



Inhab. St. Bias. H. Cuming, Esq. 



Like A. marginatus, but the arms are shorter and broader. 



