312 





Measurem ents — Continued . 



length 



Width 



A p. Length 



Ap. Width 



21.5 



13.5 



16.5 



7 . 



20. 



12.5 



14. 



6.5 



18.5 



12. 



14. 



6.5 



18. 



12.5 



14. 



6.5 



18.5 



11.5 



12.5 



6.5 



17.5 



11. 



13. 



6. 



19. 



11.5 



15. 



6. 



19. 



12.5 



14.5 



7. 



Paratype 



Holotype. — M. C. Z. no. 51850; and paratypes, M. C. Z. no. 51851, collected 

 at Reed Spring, Centerville, Reynolds Co., Missouri, by P. S. Remington. 



Remarks. — A very large species, exceeded in size only among 

 the east American forms by Physa parker'i DeCamp. The type 

 series contains the largest examples, though these are only 

 slightly larger than specimens of this species from other localities. 



This is an apparent offshoot of P. hawnii stock and so far as 

 known, is limited to the northern area of the Ozarkian region. 



Physa remingtoni, sp. nov. 



Fig. 4- 



Description. — Shell sinistral, imperforate, medium in size, rounded-elliptical. 

 Color rather dark reddish horn, whorls 5, slightly shingled, well rounded. 

 Whorl preceding body whorl decidedly convex. Spire rather short and obtuse. 



Pig. 4. Physa remingtoni Clench. 



