67 



color. Abundant in Muskeget Channel at a depth of from three 

 to five fathoms. 



ECHINODERMS. 



11. AsTERACANTHioN FoRBEsi, Desor. Rays about two and a 

 half times as long as the disk is broad. Differs from A. rubens 

 in its more cylindrical rays, and in its spines, which are not 

 pointed, but obtuse and canaliculate along the avenues. Color 

 reddish brown. Dredged from a depth of eight fathoms in the 

 Vineyard Sound. 



12. AsTERACANTHiON KUBENS, Mull. Found at all depths, 

 from low water mark to twenty-five fathoms. 



13. AsTERiAs spoNGiosA, Fabr. Frequent among barnacles, 

 at depths of from five to fifteen fathoms. 



14. Ofhiocoma aculeata, MiJlI. Frequent amonoj barnacles, 

 at the same depth as the preceding species, and commonly asso- 

 ciated with it. 



15. EcHiNARACHNius PARMA, Rumph. Found in great 

 quantity among the Shoals of Nantucket, at an average depth of 

 from six to twenty fathoms. Of a bright red color, but turns 

 green after death. E. atlanticus^ Gray, is nothing but a young 

 individual of this species. 



16. Echinus granulatus. Say. Found scattered at all depths 

 from low water mark to twenty-five fathoms. Of a beautiful 

 green color at the greatest depths. 



17. SiPUNCULUs bernhardus, Forbes. Frequent in the Vine- 

 yard Sound, at the depth of from six to twelve fathoms. Found 

 generally in the shells of Buccinum triviitatum, Say, which are 

 very common in this locality, at that depth. 



18. CucuMARiA FusiFORMis, Forbes. But one specimen was 

 found, white, tinted with pink on the back. It was dredged near 

 South Shoal, from a depth of twenty-two fathoms. 



Mr. Desor described also two new species of Sponges. 



19. Spongia urceolhta, Desor. Cup-shaped, with a lobated 

 margin ; perforations very minute. Diameter 1 inch. It is of a 



