[425] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 131 
Page. Page. 
O. dichotoma .......-..... 407 | Halecium gracile...... .. 328 
O. commissuralis .......... 327 | Eudendrium dispar........ 408 
Lafoéa calearata........... 408 | Pennaria tiarella.......... 327 
Sertularia argentea........ 408 | Thamnocnida tenella...... 407 
S. cupressina ............. 408 | Hydractinia polyclina ..... 328 
Hydrallmania faleata...... 408 
Polyps. 
Page. Page. 
Sagartia modesta.......... 330] Edwardsia lineata ........ 421 
Metridium marginatum.... 329] Astrangia Dane ...-...... 421 
PROTOZOA. 
Sponges. 
; ; Page. Page. 
Grantia ciliata ............ 330] Cliona sulphurea.......... 421 
Chalina, sp....--.-...-...- 409| Halichondria, sp.........-- 330 
C. oculata .....,. eee 409! Tedania, sp.-......-....-- 409 
Foraminifera. 
Page. 
NUMEROUS SPCCIOS 22% crnadetad ce at he ee ew see Sa wee ee Gee a 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 Nantucket 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, a, b; 
66, a,b; 67, a,b; 68, a,b; 71, a, b,d; 73, a, b,c, e, f. In Vineyard 
Sound, at line 14, 9, h; 25, a,b; 27, a,b; 30, a,b; 37, h, 7; 48, a, 0; 
46, ¢,d; 47, d,e; 48, a,b. A large portionof 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- 
