226 APPENDIX F. SHELLS. 



12. Physa heterostropha, Say. 



12 specimens were taken in Otter creek July 13th. 



13. Lymn^ea caperata, Say. 



2 specimens were taken May 16th, one day from Cache creek. 



• 14. Planorbis lentus, Say. 



Several specimens were taken with the preceding; also in Otter 

 creek, July 13th, 



Geographical Distribution. 



Nos. 3, 11, 12, and 13 occur also through the western and eastern 

 States. No. 8 has its northeastern limit in Lake Champlain. Although 

 Ohio specimens of this species are easily distinguished from those of 

 Lake Champlain, it is remarkable that these Texan shells cannot be 

 distinguished from them. Nos. 5, 6, and 14 are southern species. No. 

 10 has hitherto been known only as a Texan shell. ThPremainder are 

 western and southern species. 



NOTICES OF ADDITIONAL SPECIES OF SHELLS: BY G. C. SHU- 



MARD, M. D. 



1. Unio anodontoides, Lea. 



Found in the Little Witchita, and in a small creek between Fort 

 Washita and Fort Arbuckle ; quite abundant, and the specimens very 

 beautiful. 



2. Unio rugosus, Barnes. 



Occurs with the preceding species at all the localities above men- 

 tioned. The specimens are less ventricose than any we have seen from 

 the Ohio basin. They approach more nearly to a variety brought by 

 Prof. Litton from Red river of the north. 



