312 



Measureinenta — Continued . 



Length 



Width 



Ap. Length 



Ap. Width 



21.5 



13.5 



16.5 



7 . Para 



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. 



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 parkeri DeCamp. The type 

 series contains the largest examples, though these are only 

 shghtly 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. 



Fig. 4. Physa remingtoni Clench. 



