311 



Physa plena, sp. nov. 

 Fig. 3. 

 Description.— -Shell large in size, imperforate, sinistral, globose to globose- 

 ovate. Color light brown to dark straw sometimes tinged with vinous on the 

 body whorl. Whorls 5, convex, last considerable inflated. Spire produced, 

 less so on juvenile specimens. Aperture large, ovate or ovate elliptical, not 

 notable flaring basically. Parietal lip of a moderately strong deposit on the 

 body whorl. Palatal lip thin, marginate. Columella whitish, rather wide, 

 slightly twisted and inclined a little to the left. Sutures impressed, though not 

 deeply, usually margined inferiorly, with a light yellowish straw line. Sculp- 

 ture of moderately fine growth lines, irregularly spaced, sometimes body 

 whorl strongly malleated. An occasional indication of cross striae. Varicose 

 bands brownish red when viewed from within the aperture, yellow-straw 

 from without. 



FiCji. 3. Phyaa plena Clench. 







Measurements. 







Length 



Width 



Ap. Length 



Ap. Width 





21. 



13. 



14. 



8. mm. 



Ilolotype 



22.5 



14.5 



16.5 



8. 



Paratype 



19.5 



13. 



14.5 



7.5 



i( 



19. 



13. 



14.5 



8. 



i( 



18.5 



12. 



13.5 



6.5 



i( 



