1920. NATURAL SCIENCES OF PHILADELPHIA. 3 



CYCLOPHORIDiE. 

 Aperostoma dysoni (Pfr.) 



Bonnefil Farm, Rio Surubres, 700 ft. Oct. 20, 1909. 



HELICINID^ 

 Helicina funcki Angas. 



Guapiles, 980 ft. Nov. 18, 1909. 



Helicina deppeana parvidens n. subsp. 



Juan Vifias, farther waterfall, 3300 ft.; also on the road to Rio 

 Reventazon, 3000 ft. Type, No. 105286, A. N. &. P. 



The shell resembles H. deppeana v. Martens, of eastern Mexico, 

 except that there is only a very low, rather wide prominence at the 

 junction of the columella and basal lip, with no appearance of a 

 notch below it. 



Alt. 10, diam. 13.3 mm. 



OLEACINIDiE. 

 Streptostyla viridula Angas. 



Near Juan Vinas, on road to Rio Reventazon, between 2500 and 

 3000 ft. July 23, 1909. 



ZONITIDiE. 

 Guppya calverti n. sp. Fig. 1, 



Stream near the railroad west of Juan Vifias, 3300 ft. Type No. 

 105266, A. N. S. P. 



The shell is perforate, pyramidal, fragile, pale yellow. The apex 

 is obtuse, outlines of the spire straight; periphery acutely keeled; 

 base convex. The surface is smooth and glossy. The whorls are 

 convex, the last very narrowly concave on both sides of the thin 

 median keel, the concavity forming a narrow impressed margin 

 above the last coil of the suture. The base is impressed around the 

 narrow perforation. The aperture is rhombic, acutely angular at 

 the termination of the peripheral keel. Columella is short, sub- 

 vertical, the columellar margin reflexed in a triangular plate half 

 covering the perforation. 



Alt. 2.5, diam. 3 mm.; 5 whorls. 



This species is very distinct by its acute peripheral keel. The 

 only form of the region approaching it is the much largei G. angasi 

 Tryon,^ which differs in proportions. 



^ Stenopus guildingi Angas, Proc. Zool. Soc, 1879, p. 284, not of Bland, 1865. 

 Renamed Hyalinia (Stenopus) angasi Tryon, Manual of Conchology (2) II, 

 1886, p. 182; and again, Guppya angasi v. Martens, Biologia Centrali- 

 Americana, Moll., 1892, p. 120. 



