310 





Fig. 1 



AND 



2. Physa saliua 

 Measurements 



Clench. 





Length 



Width 





Ap. Length 



Ap. Width 





20.5 



11. 





14. 



6 . 5 mm . 



Holotype 



22. 



12. 





14.5 



7. 



Paratype 



21. 



11. 





14. 



7.5 



u 



19. 



10. 





13. 



7. 



u 



21. 



10.5 





13. 



6.5 



u 



Holotype. — M. C. Z. no. 79387; collected at a brackish spring, Skeen's 

 Ranch, Promontory, Box Elder Co., Utah, in 1877. R. E. Call Collection. 

 Paratypcs. — M. C. Z. no. 4239; data same as for holotype. 



Remarks. — This species is in all probability an offshoot of 

 P. smithiana stock and can be placed after this species. Though 

 slightly striate, it has nothing in common with P. virgata other 

 than this character. P. salina is quite remarkable for possessing 

 such straight sided whorls, and having very deeply indented 

 sutures. This last character is not exceeded or even equalled by 

 any other species of Physa known to me. Its straight sided 

 whorls are quite similar to those produced in certain species of 

 the genus Bulinus, especially B. contortus Mich. 



