1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 449 



NOTES ON SOME INDIAN TERRITORY LAND AND FRESH-WATER 



SHELLS. 



BY CHAS. TORREY SIMPSON. 



The shells upon which the following notes are based were collected 

 by the writer during a brief visit to the eastern portion of the Territory 

 in the spring of 1888.. On account of business, but a small portion of the 

 ■two weeks I was in the " Nation" was spent in collecting. The reason 

 for finding so few fresh-water species was the excessive amount of rain 

 that fell just at the time of my arrival, which so raised the streams 

 and ponds that for the most part I could obtain nothing. 



Several very dry seasons had occurred previous to my visit, and as 

 forest and prairie fires had raged with great violence I found in many 

 places, and of several species, only dead shells. Most of the species 

 enumerated have passed under the hands of Drs. Dall and Stearns of 

 the U. S. National Museum, and I give the names of such just as they 

 were given by them. 



Helix (Triodopsis) copei Wetherby. 



Under sandstone rocks ; mountains near McAllister. Mostly dead, 

 having been destroyed by forest fires. 



? Helix (Triodopsis) vultuosa Gould. 



Near Eufaula. A few specimens. Possibly a form of H. copei, as 

 the two species seem to be quite close. 



? Helix (Triodopsis) inflecta Say. 



Abundant at Fort Gibson, Limestone Gap, and Eufaula. 



Helix (Patula) altemata Say. 



Fort Gibsou. The strongly ribbed variety. 



Helix (Polygyra) jacksoni Blaud. 



On limestone mountains near Fort Gibson. Very abundant. Lime- 

 stone Gap, a few specimens. Several thousand shells of this species 

 were found, and, with a half dozen exceptions, were much larger than 

 the measurements given in Binney's Manual of American Laud Shells. 

 The greater diameter averaged 10, lesser 9 mm ; height 5 mm . A few speci- 

 mens were found in and near Fort Gibson measuring 7" 1 " 1 greater di- 

 ameter. 



A form was found abundantly near Fort Gibson which differs re- 

 markably from the type. Instead of the bicrural tooth on the body 

 whorl at the aperture there is a heavy elevated deltoid callus, which is 

 joined to the upper and lower margins of the peristome, and which 

 occupies about the same area as the tooth in the type. The number of 

 whorls is 5; greater diameter 7, lesser 6 mm ; height, 3""". In examining 

 Proc. N. M. 88 29 



