APPENDIX F. SHELLS. 225 



4. Unio anodontoides, Lea. 



1 specimens were taken in Otter creek July 13th; one of them is 5 

 inches long, 2 to 3 inches high, and 1.6 inch wide. 



5. Unio parvus, Barnes. 

 1\ specimens were taken in Otter creek July 13 th. 

 6. Unio htdianus, Lea. • 



2 specimens were taken near Fort Washita July 31st. 



7. Unio l^evissimus, Lea. 



The specimen is for this species remarkably thick; the nacre is deeply 

 colored with reddish-purple, and there are some fine radiating striae 

 behind the umbones. No label, but may have been taken in Otter creek, 

 since it was in the same parcel with the next species. 



8. Unio gracilis, Barne?. 



Several spedBaens were taken in Otter creek July ,13th, and some 

 July 15th, probably in a branch of Cache creek, a few miles west of 

 Otter creek. 



9. Cyclas distorta, Prime. 



4|- specimens were taken in Otter creek July 13th. . 



GASTEROPODA. 



10. Buximus liquabilis, Reeve. 



4 specimens (dead) were taken in Otter creek July 13th. This is 

 the only terrestrial species in the collection. 



11. Physa ancillaria, Say. 



3 specimens were taken in Otter creek July 13th. They are more 

 shouldered than is usual, but not so much as the variety figured by Pro- 

 fessor Haldeman, Monog. Physa, pi. 3, fig. 5. 



15 



