MEXICAN LEPTINARIA. 309 



pressed, subgradate, the last well rounded basally. Aperture 

 subvertical, trapezoidal-piriform, the outer margin slightly 

 arcuate above, a little arched forward, basal margin broadly 

 rounded ; columellar margin subvertical, wide, abruptly taper- 

 ing near the base, encircled with a distinct, lamelliform spiral 

 fold. Parietal wall covered with a very thin callus (Marts.). 



Length 10.5, diam. 8, aperture 5.5 x 3 mm. 



Length 9.5, diam. 6, aperture 5x3 mm. 



Length 8.5, diam. 5, aperture 4 x 2.5 mm. 



Costa Rica : La Palma, San Francisco de Guadalupe, La 

 Uruca, San Jose, Santa Clara, Alajuelita, near Talamanca, 

 and middle course of the Rio Pacuare del Sur (Biolly and 

 Pittier) . 



L. pittieri MARTENS, Biologia, pp. 317, 639, pi. 18, f. 7 

 (1898), with var. obliquata Marts., 1. c., pi. 18, f. 8. 



Width of the perforation somewhat variable. In the speci- 

 men from Santa Clara are six calcareous white eggs of glob- 

 ular form, 1.7 to 1.8 mm. in diameter (Marts.). 



Var. obliquata Martens. PI. 41, fig. 14. Differs by having 

 the columellar margin obliquely produced downward and out- 

 ward, with a dentiform fold. Length 10, diam. 6, aperture 

 5x3 mm. Last whorl, seen from the dorsal side, as 1 : 2. 

 Central Costa Rica at Tarbaca. 



21. L. HYALINA (Tate). 



"Related to interstriata, hyaline with a higher and more 

 inflated body-whorl. Length .23, height of last whorl .12, 

 breadth .15 inch. One specimen only was obtained with Bul- 

 imus berendti" (Tate). 



Eastern Nicaragua: Toro Rapids, of the river San Juan 

 (Tate). 



Tornatellina Jiyalina TATE, Amer. Journ. of Conch., v, p. 

 157 (Feb. 3, 1870). Leptinaria h., MARTS., Biologia, p. 317. 



Not figured. "Perhaps identical with my L. pittieri" 

 (Marts.). 



22. L. EXIGUA Martens. PI. 42, fig. 30. 



Shell ovate, perforate, thin, very lightly striatulate, rather 

 glossy, pellucid, more or less variegated with white. Whorls 



