1894.] naturaIj sciences of Philadelphia. 27 



rivulet inhabited by Anculosa was "stolen" from the James by the 

 Koauoke drainage, thus transferring the species.^ 



Goniobasis virgiiiica is aj)parently a much older resident of the 

 eastern couutry. It ranges from the Connecticut River (at Deep 

 River, Conn.) to middle Virginia. The genus Goniobasis is known 

 to be a much more ancient group geologically. 



The distribution of Aiiciilosa carinata is pretty thoroughly known 

 by the localities given in Tryon's monograph, and the specimens in 

 the collection of the Philadelphia Academy and the U. S. National 

 Museum.* It extends northward to the headwaters of the Susque- 

 hanna in New York State. Both of the collections named possess 

 specimens said to be from regions outside of the Chesapeake drain- 

 age, such as "Ohio," "Lake Erie," etc., audDeKay reports it from 

 "Lake Champlaiu;" but these localities are, there is not much 

 doubt, false. The older collectors were not so punctilious about cor- 

 rect habitats for their shells as we have now learned to be; and in 

 the absence of confirmation by later collections the evidence of these 

 old labels must be held insufficient. Lakes Champlain and Erie, 

 and the State of Ohio, are now well known to many ardent and 

 reliable students of conohology, and such a conspicuous shell as A. 

 carimda would not be overlooked by them. 



The following localities are represented in the collections made by 

 Mr. Ives and myself: 



Susquehanna River, York Co., 62,820, collected by Witmer 

 Stone. Specimens small, 8-10 ram. long. Apices much eroded. 



Couecocheague River, west of Hagerstown, Md. , 64, 757, under 

 slabs and flakes of shale in rapid current; specimens rather small arid 

 black- brown or by transmitted light dark- green; the last whorl 

 mostly rounded. Another lot, 64,768, collected from the upper sur- 

 faces of stones along the shore at the same place, averages much 

 larger. The specimens are light olive-colored. Apices perfect or 

 nearly so. 



Licking Creek, Md., on black limestone, 64,841. 



Flintstone Creek, Fliutstone, Allegheny Co., Md., 64,769. 

 Specimens nearly black and acutely keeled. Apices entire, living 

 on the under surface of stones. 



-See in.staiu-cs cited in Stir/uf. .Fiily 1S!)3, p. 3(5. 



^ Mr C. T. Simpson has kindly furnished me with a list of localities represented 

 in the National Museum. 



