[643] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 349 



Casco Bay, 20 to 40 fathoms ; Bay of Fundy, 15 to 60 fathoms. Halifax 

 (Willis) 5 Gaspe (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 AY AHA Perkins, (p. 306.) 



Proceedings, Boston Soc. Nat. History, vol. xiii, p. 113, 18(i9 (iu 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 to 10 fathoms ; 

 Long Island Sound ; Great Egg Harbor, New Jersey ; Nantucket (Ad 

 ams) ; Fort Macon (Cones) ; 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 I 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 Macou, 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 suc 

 ceeding ones usually have numerous vertical costre ; the last whorl has 

 10 to 13 more or less prominent, smooth obtusely rounded, somewhat 

 curved costre, separated by wider concave intervals, and gradually dis 

 appearing below the middle; below the costa3 are numerous, well im- 



