EPIROBIA. 65 



24 to 27, very convex, especially below the suture; the last 

 shortly free in front, tapering to the rounded base. Aperture 

 subvertical, rounded-ovate, the orifice pear-shaped; peristome 

 rather broadly expanded, somewhat reflexed, much narrower 

 and somewhat retracted at the upper outer angle. 



Internal column slender, more or less swollen within each 

 of the lower whorls, nearly cylindric above, the swollen por- 

 tion roughened by acute granules, indistinctly arranged in 

 descending series (pi. 20, fig. 11). 



Length 19, diam. 2.5, longest axis of apert. 2 mm.; whorls 

 27. 



Length 17, diam. 2.5, longest axis of apert. 2 mm.; whorls 

 25. 



Cordova, State of Vera Cruz (Salle). 



Cylindrella polygyra PFR., P. Z. S., 1856, p. 322 ; Conchyl. 

 Cab., p. 31, pi. 8, f . 6-8 ; Monogr., iv, p. 704. FISCH. & CROSSE, 

 Miss. Scient. Mex., Moll., p. 405, pi. 17, f. 16. SOWERBY, Conch. 

 Icon., xx, pi. 7, f. 5. Epirobia polygyra Pfr., STREBEL, Bei- 

 trag, iv, p. 87, pi. 5, f. 7 a, b, pi. 13, f. 2 (radula), pi. 14, f. 14 

 (axis). PILSBRY & VANATTA, Proc. A. N. S. Phila., 1898, p. 

 281, pi. 17, f. 2 (radula). Holospira polygyra Pfr., MARTENS, 

 Biologia, p. 284. 



Larger than E. apiostoma, with more whorls, much more 

 prominent thread-like striae, and a more broadly expanded lip. 



E. POLYGYRELLA (v. Martens) . PI. 20, figs. 8, 9, 10. 



Shell subrimate, fusiform-subulate, closely arcuate costu- 

 late, opaque, fleshy-gray; spire regularly tapering, the apex 

 rather large, entire. Whorls 22, convex, the diameter exceed- 

 ing double the alt., the last moderately free, rounded. Aper- 

 ture slightly oblique, obliquely pear-shaped, the peristome 

 expanded throughout, whitish. Length 14, diam. 2 1 / 4, diam. 

 of aperture iy 2 mm. (Mart.). 



The columellar axis is longitudinally costate, the costse being 

 partly divergent and partly forked above; the lower half 

 within each whorl is not particularly swollen (fig. 8) 

 (v. Mart.). 



Northern Guatemala: Cohan, Vera Paz, copiously (Salvin, 

 Sarg. et al.). 



