[643] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 349 
Casco Bay, 20 to 40 fathoms; Bay of Fundy, 15 to 60 fathoms. Halifax 
(Willis) ; Gaspé (Whiteaves); Murray Bay (Dawson); Mingan (Foote). 
This shell occurs sparingly at all these localities. It has not been 
recorded from south of Cape Cod by any one except Linsley, and it 
must be regarded as a very doubtful member of the fauna of Southern 
New England until rediscovered. 
Dr. Dawson records one broken specimen from the Post-Pliocene of 
Montreal. 
ANACHIS AVARA Perkins. (p. 306.) 
Proceedings, Boston Soc. Nat. History, vol. xiii, p. 113, 1869 (in part). Colum- 
bella avara Say, Journal Acad. Nat. Sciences, Philadelphia, vol. ii, p. 230, 1822 ; 
(in part) Gould, Invert. of Mass., ed. i, p. 313; ed. ii, p. 356 (in part). 
Cape Cod to Northern Florida; Western Florida and the northern 
shores of the Gulf of Mexico. Vineyard Sound, from 0 to 10 fathoms; 
Long Island Sound; Great Egg Harbor, New Jersey ; Nantucket (Ad- 
ams); Fort Macon (Coues); South Carolina (Gibbes); Georgia (Couper) ; 
Western Florida (Jewett). North of Cape Cod, it is local and rare ; 
Massachusetts Bay (Stimpson). 
Fossil in the Post-Pliocene of North and South Carolina, and in 
the Pliocene of South Carolina. 
Among the shells usually referred to this species there are great va- 
riations in form and sculpture, and the color is quite inconstant. The 
numerous specimens that I have examined from various localities can, 
however, be arranged in two groups, between which [ have found no 
specimens that can be regarded as truly intermediate, although most of 
their distinctive characters are variable in each series. For the pres- 
ent, therefore, I have with some hesitation followed Mr. Ravenel in re- 
garding these two principal forms as distinct species. As these species 
(or varieties) have not been distinguished by most writers, it is probable 
that some of the northern localities given above should properly go 
under the next species, which is far more abundant in Vineyard Sound 
and Long Island Sound than the typical avara, while the latter predom- 
inates in the collections from Fort Macon, North Carolina, and south- 
ward. The figures given by Dr. Gould represent the ordinary northern 
form of the following species. In the first part of this report both forms 
are included under avara. 
From Fort Macon I have specimens that agree perfectly with Say’s 
original description of avara. These are less elongated than the next 
species, and rather fusiform, the thickest part being but little below the 
middle, with the spire acute. The mature shells have ten flattened 
whorls; the first three or nuclear whorls are smooth; some of the sue- 
ceeding ones usually have numerous vertical cost ; the last whorl has 
10 to 13 more or less prominent, smooth obtusely rounded, somewhat 
curved cost, separated by wider concave intervals, and gradually dis- 
appearing below the middle; below the cost are numerous, well im- 
