THE NAUTILUS. 



note that in Marl Lake a small enlargement of Marl River, which 

 connects Higgins and Houghton Lakes, the typical L. stagnalis 

 appressa was the only form found. 



Lymnaa desidiosa var. peninsula, n. var. PI. II, fig. 7. 



Shell slender, elongated, spire long and acute, subturreted, whorls 

 of the spire very convex, with a very deeply impressed suture, body- 

 whorl elongated, subcylindrical, aperture oval, not very much ex- 

 panded. 



Alt. 13.50, diam. 6.25 mm. 



( To be continued. ) 



LIST OF MOLLUSK8 FROM AMAEILLO, TEXAS. 



KY J. B. HENDERSON, JR. 



The " Pan Handle " of Texas is a flat, treeless plain where the 

 traveler could make good use of nautical instruments. I could find 

 no vestige of molluscan life there except in the deep canons, a few 

 of which are encountered on a journey across the " Handle." The 

 following is a list of species taken from one of these canons at a point 

 about 15 miles S. E. of Amarillo. All were found in drift debris 

 none actually alive and crawling about. The identifications are by 

 Pilsbry and Vanatta. 



Zonitoides singleyana Pils. 



Zonitoides minuscula Binn. 



Vallonia perspectiva Sterki. 



Vallonia gracilicosta Reinh. 



Helicodiscus parallelus Say. 



Pupoides marginatus Say. 



Bifidaria pellucida hordeacella Pils. 



Bifidaria tappaniana C. B. Ad. 



Bifidaria armifera Say. 



Bifidaria procera cristata P. & V. 



Vertigo ovata Say. 



Planorbis parvus Say. 



A few specimens of Physa, Lymnaea and Pisidium too young for 

 identification were also found. 



