178 HYPSELOSTOMA. 



f 2 . Neck rather short, ascend- 

 ing; 2x2 mm. Coron, Cal- 

 amianes. H. pusillum, no. 10. 



f 3 . Neck very shortly free and 

 strongly ascending; alt. 2, 

 diam. 2.3 mm. Sibuyan. 



H. sibuyanicum, no. 7. 



Continental Species. 

 1. HYPSELOSTOMA TUBIFERUM (Benson). PI. 31, figs. 1 to 5. 



Shell depressed conoid, very lightly radially striate, cor- 

 neous; spire shortly conoid, the apex rather obtuse; suture 

 channeled ; whorls 3%, convex, the last forming a tube which 

 is drawn out and twisted upward, above the summit; at the 

 periphery strongly, obtusely carinate; having on the upper 

 surface a swollen belt separated from the periphery by a deep 

 furrow, the lower surface convex, angular to the aperture 

 around the open, perspective umbilicus. Aperture nearly 

 horizontal, looking upward, 6 or 7 toothed, teeth lamelliform, 

 two parietal (the superior stronger, doubled, the inferior small 

 and deeply placed), one moderate columellar, four palatals, 

 of which the upper one is duplicate and the third one larger. 

 Peristome expanded throughout, a little reflected. Greatest 

 diam. 4, min. 3, height 2 mm. (Pfr.). 



Burma: Thyet-Mio, on the banks of the Irawadi, on lime- 

 stone rocks (Blanford, Theobald, Oldham). Ava (Benson): 

 Peak of Mya Leit Doung, about 20 miles south of Mandalay ; 

 Tsagyen Hills; and in Pegu as far south as Henzada (Blan- 

 ford). 



Tanystoma tubiferum BENS., Ann. Mag. N. H. (2), xvii,, 

 1856, p. 130. Hypselostoma tubiferum Bens., PFB., Novit. 

 Conch., i, p. 130, pi. 36, f. 1-4; Monogr. Hel. Viv., iv, 325; v, 

 437. STOLICZKA, Journ. Asiatic Soc. Bengal, xl, 1871, p. 173, 

 pi. 7, f. 1. BLANFORD, J. A. S. B., xxxii, 1863, p. 326. HAN- 

 LEY & THEOBALD, Conch. Indica, pi. 8, f. 3. GUDE, Fauna of 

 Brit. India, Moll., ii, 1914, p. 298. 



In this type species of Hypselostoma the angular and pari- 

 etal lamellae are wholly concrescent into a single lamella with 



