GUDE : ON THE ARMATURE OF LAND MOLLUSCA, 69 



Genus Tonkinia, Mabille, 



is allied to Hypselostoma, and is known by a single species — 

 T. mirahilis, Mab., from Tonkin. The aperture is on a level with 

 the spire, as in the genus Anostoma, the animal thus carrying the 

 shell, which measures only 5 mm. in diameter and 2 mm. in height, 

 with the spire downwards. The narrow, elongated mouth is 

 furnished with a strong, entering, parietal lamella and a columellar 

 fold, also entering, and bifid at the inner extremity, the latter 

 forming a little channel at the angle of the columellar margin of 

 the peristome. 



Genus Boysidia, Ancey, 



occurs in India, Farther India, Malaysia, and China. In B. 

 plicidens, Bens., there are three parietal lamellae, the two upper ones 

 being deeply entering, the second triangular and more elevated 

 anteriorly, the third small and deep-seated. The palatal denticles 

 are usually five in number, deep-seated, the three upper largest, 

 the two lower minute ; an elongated denticle occurs on the columella. 

 B. messageri, Bav. & Dautz., and B. gereti, B. & D., from Tonkin, 

 possess one parietal and one columellar, entering lamellae, but whereas 

 the former has three the latter has only one palatal fold ; on the 

 other hand, B. robusta, B. & D., and B. paviei, B. & D., also from 

 Tonkin, are provided each with one columellar and two parietal 

 laminae, but the former possesses three palatal and the latter four 

 palatal plicae ; finally B. lamothei, B. & D., is furnished with three 

 parietal, one columellar, and five palatal folds, the upper parietal 

 forming a sinus with the upper palatal fold. 



Genus Bifidaria, Sterki. 



Originally established as a subgenus of Pwj^a [i.e. Pupilla], it has 

 since been raised to generic rank by Dr. Pilsbry, the species ranging 

 over America, Asia, Polynesia, New Caledonia, and Mauritius. 

 B. tuba, Pils., a native of Arizona, has the angular and parietal 

 lamellae combined into one long fold ; there are : a deep-seated 

 columellar lamella — slightly bifid — small, short, upper and lower 

 palatal and basal folds, with a minute denticle between them, 

 and another at the base. B. huttoniana, Bens., an Indian form, 

 possesses a sinuate, parietal lamina, sometimes bifid, two palatal 

 folds, and one or two columellar plicae. 



Genus Odontostomus, Beck, 



has several species in South America, fairly large, with elongated, 

 much obstructed, aperture. 0. pantagruelinus, Moric, from Brazil, 

 has one oblique, entering, high, tongue-shaped lamella on the 

 parietal callus with buttresses on the columellar side ; the columellar 

 lamina is erect, long, plate-like ; there is a basal fold varying from 

 simple and acute to compound and serrate ; and finally it possesses 



