BACILLUM. 3 



A specimen before me measures : length 62, diam. 11, 

 length of aperture 12.2 mm. ; whorls 14. The apex is of the 

 round-topped cylindric type. Initial three-fourths of a whorl 

 smooth (worn in the specimen seen) ; fine vertical rib-striae 

 then set in. The third and fourth whorls do not increase in 

 diameter over the second; but with the fifth a regular but 

 slow increase begins. This specimen (figs. 3, 12), agrees with 

 the type description and figure except that the columella is 

 less curved. 



Nevill gives the following localities for specimens in the 

 Indian Museum: Khasi Hills, Dafla Hills (Godwin- Austen) ; 

 Assam, a young sinistral specimen (Stoliczka) ; and, doubt- 

 fully, Andamans, on the assertion of a native collector. 



2a. B. orthoceras austeni n. subsp. PI. 1, fig. 4. 



Shell with the gray color, deficient cuticle and convex 

 whorls of B. ortkoceras, but much more rapidly tapering, the 

 last whorl being much wider; striation coarser. Spire 

 straightly tapering, very slender above. The early whorls are 

 broken from the type specimen, 91/2 remaining. Length 

 (broken) 53.8, diam. 12, length of aperture 12.5 mm. 



Naga Hills (coll. A. N. S. P., from a London dealer). 



In a similarly broken specimen of B. cassiacum of about 

 the same length as the type of Austeni there are eleven whorls 

 remaining, and the shell measures: length 52, diam. 10, 

 length of aperture 11 mm. 



3. B. CASSIACUM ('Bens/ Rve.). PI. 1, figs. 5, 6, 7. 



Shell elongate-subulate, solid, closely and rudely obliquely 

 plicate; white, covered with an olivaceous-brown cuticle. 

 Spire lengthened, the apex subpapillar. Whorls 14 to 15, 

 flattened, the last subangulate peripherally. Columella 

 strongly arcuate, abruptly truncated. Aperture subrhombic- 

 semioval; peristome simple, unexpanded. Length 64, diam. 

 12, aperture 13x7 mm. (Pfr., from spec, in Benson coll.). 



Naga Hills; Toruputu, 7,000 ft. ( Godwin- Austen) . 



Achatina cassiaca Bens, mss., REEVE, Conch. Icon., v, pi. 

 17, f. 85 (June, 1849). PFR., Monogr., iii, p. 499; iv, 615; 



