68 PKOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



by a slender low revolving lamella. The section Aspasita, West., 

 comprises three species, from Hungary. H. triaria, Friv., has two 

 small denticles, one on the uj)per and one on the lower lip, while 

 H. trinodis, Kim., has these two denticles stronger and more 

 developed, and bears in addition a strong, entering, oblique fold on 

 the parietal wall. The section Trissexodon, Pils., contains only 

 two species, one from the Pyrenees and one from Southern Spain, 

 H. constricta, Boub., and H. quadrasi, Hid. Here the parietal callus 

 has the outer edge raised into a transverse lamella, narrowly con- 

 stricting the aperture. The section Mastigophallus, Hesse, again 

 was established for the reception of one species, H. rangeana, Fer., 

 also from the Pyrenees. This is a remarkable shell, having the upper 

 margin fluted at its j unction with the peripheral carina . The aperture 

 is very narrow, the outer margin is constricted and bears a short, 

 oblique fold, while the lower margin has a raised callus. In the 

 section Caracollina, Beck, we find H. tlemcenensis, Bgt., from 

 Algeria, a species also with a narrow, lunar aperture, furnished witji 

 a short denticle on the basal wall and a broader one on the outer 

 margin. 



The next group to claim our consideration is that known as the 

 PuPiLLiD^, most of the members of which are furnished with teeth 

 or lamellae at the mouth. The first to be dealt with is the 



Genus Anostoma, Fischer. 



The species are few in number and restricted to northern South 

 America. They are peculiar from the fact that the last whorl is 

 carried upwards, the mouth being consequently on a level with the 

 jDeriphery the effect being that the animal carries its shell with 

 the spire downwards. A. globulosum, Lam., and A. verreauxianum, 

 Hupe, are typical examples, the former having two strong, raised, 

 flexuous, entering laminae on the parietal wall and four raised, flexu- 

 ous entering folds on the outer wall ; the latter has only three short 

 lamellae on the outer wall, the upper one being very small, the two 

 parietal laminae are also less developed than in its congener. 



Genus Hypselostoma, Benson, 



ranges over Burma, Farther India, China, Malaysia, the Philippine 

 and Loo-Choo Islands. They are all very small shells. In the type 

 of the genus H. tuhiferum, Bens., the last whorl, as in the genus 

 Anostoma, is carried upwards, the mouth being horizontal and on 

 a level with the apex. In the other species the last whorl is solute 

 and not carried upwards, the mouth being either oblique or vertical. 

 The aperture exhibits from four to seven lamellae ; in H. tuhiferum 

 one of the two parietal ones sometimes being bidentate, with one 

 columellar and four j)alatal ones. 



