igo8.] Records of the Indian Museum. igq 



Altitude . . . . 26 mm. 



Diam., major . . . . 10 ,, - 



Aperture, alt, . . . . 9'5 ,, 



diam. .. 4 ,, . 



Habitat — Andaman Islands. 



Risella halteata, sp. nov. ..... 



Shell conical, narrowly and deeply perforate, sharply carinate 

 and slightly undulately waved at periphery, pale yellow with a 

 broad pinkish yellow median band; whorls 4, somewhat convex, 

 spirally striate ; sutures impressed ; base of shell flattened, spirally 

 grooved and transversely striate ; aperture obliquely sub- 

 quadrate. 



Altitude . . . . 175 mm. 



Diam., major . . • • 3 ,, 



Aperture, alt. . . . . i'25 ,, 



diam. . . 75 ,, ... 



Habitat — Andaman Islands. 



The above species may be compared with Risella lutea, Gld. ; it 

 is, however, much smaller, less undulately waved at the peripher}^ 

 and less coarsely striate on the upper whorls. 



Alaha warncfordiana, sp. nov. 



Shell turriform, yellowish white ; whorls 7 — 8, flat above, but 

 slightly bulging over the sutures, spirally striate and indistinctly^ 

 varicosely costulate ; sutures impressed ; aperture oval ; peristome 

 simple. 



Altitude . . ..4*5 mm. 



Diam., major . . . . i'5 ,, 



Aperture, alt. . . .• • i ,, 



diam. • • "5 ,, 



Habitat — Andaman Islands. 



Allied to A. blanfordi, A. Ad., but has larger and fewer varices 

 on the upper whorls ; the spiral sculpture is also coarser than is the 

 case with A. hlanfordi. 



Rissoina angnsta, sp. nov. 



Shell narrowly fusiform, solid, yellowish white; whorls 9, the 

 first three smooth, the remainder transversely, obhquely ribbed , 

 sutures impressed ; aperture ovate ; peristome somewhat sinuous. 



Altitude . . . . 4-5 mm. 



Diam., major . . . . 1-5 ,, 



Habitat — Off Port Blair, Andaman Islands, 7 — to 

 fathoms. 



