2 PSEUDOSUBULINA 



side teeth are unicuspid, the marginals with slender, thorn- 

 like cusps. 



Genitalia with the atrium swollen above ; penis very short. 

 The vagina is extremely long and rather thick. The sperma- 

 theca is globose, on a long, slender duct. 



Type P. ~berendti Pfr. The species are chiefly Mexican, but 

 a few Antlllean snails seem to belong close to or in the same 

 group. 



Most of the following forms are unknown anatomically, and 

 their reference to Pseudosubulina is in a greater or less degree 

 provisional. The group is somewhat heterogeneous in con- 

 chological characters. 



1. P. LIRIFERA (Morelet). PL 5, figs. 14-17. 



Shell turrite-subulate, <costulate, diaphanous, glossy, bright 

 corneous; suture crenulate. Whorls 9 to 10, convex, the last 

 less than one-fourth the length. Oolumella arcuate, callous, 

 the base truncate. Aperture small, oval; peristome simple, 

 thin, unexpanded. Length 12 to 13, diam. 3 mm. (Morel.). 



Guatemala : Woods of Peten near San Luis (Morelet) ; 

 Livingston (Stoll). 



Achatina lirifera MORELET, Testae. Noviss. ii, p. 12. 

 Sululina lirifera CROSSE &' FISCHER, Miss. Sci. Mex., Moll, i, 

 p. 633, pi. 25, f. 12. Pseudosubulina, I., MARTENS, Biologia, 

 p. 304, pi. 17, f. 20. 



Fig. 17 is copied from Crosse and Fischer's figure of one 

 of Morelet 's types. Figures 14-16 represent a shell from 

 Livingston, illustrated by von Martens. 



' * The first two whorls are smooth, the third and fourth com- 

 paratively large, subglobose, and provided with strong, but 

 narrow costae (fig. 15) ; on the fifth whorl commence the 

 broad and flat costae, with very narrow interstices, the sculp- 

 ture being similar on all the following whorls. The whorls 

 are very feebly- convex, rather flat, chiefly the lower ones; 

 the last whorl, seen from the dorsal side, is two-sevenths of 

 the whole length of the shell. The aperture is small, the 

 columellar margin very concavely arcuated. The two ex- 

 amples from Livingston, on the Atlantic coast, are of larger 



