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
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