[425] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 131 



Page. 



O. dichotoma 407 



O. cominissuralis 327 



Lafoea calcarata 408 



Sertularia argentea , , . 408 



S. cupressina 408 



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Halecium gracile 328 



Eudendrium dispar 408 



Pennaria tiarella 327 



Thamnocnida tenella 407 



Hydractinia polyclina 328 



Hydrallmania falcata 408 



Polyps. 



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Sagartia inodesta 330 



Metridium marginatum . . . , 329 



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Edwardsia lineata 421 



Astrangia Dana3 . . 421 



PROTOZOA. 



Sponges. 



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Grantia ciliata 330 



Chalina, sp 409 



C. oculata . 409 



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Cliona sulphurea 421 



Halichondria, sp 330 



Tedania, sp 409 



Foraminifera. 



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 Numerous species 421 



II. 7. FAUNA OF TRE SANDY BOTTOMS OF THE BAYS AND SOUNDS. 



The sandy bottoms in Vineyard Sound are chiefly found in shallow 

 water, either along the shores or on the banks and shoals. In Buzzard s 

 Bay they were met with only in few places, near the shore, and have no 

 great extent. To the eastward of Vineyard Sound, throughout the 

 greater part of Nan tucket Sound, Muskeget Channel, and the waters 

 south and southeast of Nantucket and Cape Cod, the bottom is gener 

 ally sandy, sometimes passing into gravelly and shelly. 



The true sandy bottoms are not favorable to many kinds of animals, 

 and where the sands are constantly changing, as on most of the shoals 

 in this region, the bottom is sometimes almost barren of life, though 

 certain burrowing species may occur. 



The following are some of the special localities where dredgings were 

 made on sandy bottoms: In Buzzard s Bay, at line 11, d, e,f; 64, , &; 

 66, a, b ; 67, a, b ; 68, a, b ; 71, a, &, d ; 73, a, &, c, e, f. In Vineyard 

 Sound, at line 14, g, Ji ; 25, a, b ; 27, a, b ; 30, a, b ; 37, 7t, i ; 43, a, b ; 

 46, c, d ; 47, d, e ; 48, a, &. A large portion of the species occurring on 

 these bottoms have been mentioned before either as inhabitants of the 

 sandy shores at low water, or as living upon gravelly and shelly bot 

 toms. With the exception of a few species living attached to scattered 

 shells or stones, nearly all the species are such as are adapted to bur- 



