1899.] NATURAL SCIENCES OF PHILADELPHIA. 391 



DESCRIPTIONS OF NEW SPECIES OF MEXICAN LAND AND FRESH- 

 WATER MOLLUSKS, 



BY HENRY A. PILSBRY. 



During February, March and April of this year, Mr. and Mrs. 

 S. N. Rhoads made a journey through parts of eastern and cen- 

 tral Mexico, their chief object ])eing zoological investigation and 

 collecting. Their researches were mainly confined to the States of 

 Vera Cruz, Mexico, Michoaean anrl Nuevo Leon. 



The mollusks collected, especially thos3 from the State last 

 named, prove to be of considerable interest, and a full report will 

 be prepared later. Meantime the following forms, recognized as 

 new, may be described : 

 Schazicheila fragilis n. sp. 



Shell subglobose, about the form of S. alata Mke. ; thin, rather 

 fragile, reddish; the spire conoidal; whorls 4, the last rounded at 

 the periphery, impressed in the center below. Sculpture of very 

 numerous short cuticular spiral lirse. Aperture semicircular, 

 slightly oblique, with a very slight sinus above; peristome thin, 

 .slightly expanded; columellar callus thin and small. Alt. 4.5, 

 diam. 6 mm. 



Diente, near Monterey, State of Nuevo Leon, INIexico. 



Differs from «S'. alata and S. pauiiucea in the smaller size, more 

 fragile texture, and the very much shallower notch at the upper 

 termination of the outer lip. It is a far smaller species than *S'. 

 nicoleti Shuttl. or S. hidalgoana Dall. I do not know of any 

 description of " S. minima Pfr.," figured by Strebel on PI. 3, 

 fig. 0, of the Beitrag Mex. Land- und Susswasser- Conchy lien, 

 Heft IV, but the figures, though insufficient for identification in 

 the absence of text or locality, look considerably like S. fragilis. 

 About twenty specimens were collected, part of them quite fresh, 

 but without opercula. 

 Schaziclieila vanattai n. sp. 



Shell thick lens- shaped, rather low conoid above, convex below 

 the strong peripheral carina, reddish brown, rather thin. Whorls 



