546 



PROCEEDINGS OF THE ACADEMY OF 



[Nov., 



Sucoinea panucoensis n. sp. Fig. 6. 



The shell resembles S. luteola in shape, is very thin, translucent, 

 pale yellow or amber colored, rather roughly sculptured with growth- 

 wrinkles on the last whorl. There are nearly 3^ con- 

 vex whorls, the last having its greatest convexity below 

 the middle. Aperture oblique, ovate. 



Length 13, diam. 7.2, length of aperture 10 mm. 



14, " 8, " " " 10 " 



Pujal, Alligator and Catamas Lakes, State of San 

 Luis Potosi; types from Alligator Lake, No. 99,504 

 A. N. S. P. Also taken at Tampico in 1907. 



This species stands between S. luteola and S. concor- 



dialis. It has much the contour and the pointed apex 



of luteola, but the thin, translucent shell is unlike that eartlry, opaque 



species. S. concordialis differs from both by its decidedly more obtuse 



apex. It is also somewhat more convex at the base. 



The specimens from Pujal Lake are smaller and more slender than 

 the types. One measures: 



Length 12, diam. 6, aperture S mm. 



Fig. 6. 



