76 PRESTON: DESCRIPTIONS OF NEW MARINE SHELLS. 



Thala eeylaniea n. sp. 



PI vi, figs. I, 2. 



Shell slender, attenuated ; whorls 7 — 8, sculptured with closely set transverse 

 ridges crossed by finer spiral lines, giving the shell a granulated appearance ; 

 colour pink, mottled and streaked with white and pale chestnut, the latter 

 colour developing into a broad peripheral band on the body-whorl ; aperture 

 narrow ; columella four-plaited ; peristome thickened and slightly notched 

 above. 



Alt. 10 millim. ; diam. maj. 2.5. Aperture, alt. 4 niillim. ; diam. maj. .5. 



Hah. — Ceylon. 



Nassa (Phpontis) siva, n. sp. 



PI. vi, figs, 3, 4. 



Shell ovately conic, spirally striated, especially on the apical whorls and 

 lower portion of the bod)'-whorl, and coarsely ribbed throughout e.xcept on 

 the last half of the body-whorl, where the lower portion of the ribs becomes 

 obsolete ; whorls 8 — 9, somewhat convex, pale brownish-yellow, ornamented 

 with two chestnut bands ; suture impressed ; columella distinctly plaited, 

 expanded and extending above into a callosity bearing a single plait near 

 the junction of the peristome with the whorl above ; peristome thickened 

 and slightly reflexed, having five denticles just inside the aperture, the 

 uppermost being more strongly developed than the others ; aperture obliquely 

 ovate ; canal short and rather broad. 



Alt. 12.5 millim ; diam. maj. 6.5. Aperture, alt. 6 millim.; diam. maj. 2 



Hah. — Ceylon. 



Nassa (Phrontis) gangetica, n. sp, 



PL vi, figs. 5, 6. 



Shell fusiform, spirally striate (at the base only) and coarsely rib'ied except on 

 the last half of the body-whorl, where the surface becomes quite smooth 

 bearing only a row of tubercles just below the suture ; whorls 8, fawn colour; 

 suture impressed; columella extending into a callosity reaching to the junction . 

 of the peristome with the whorl above and bearing a plait in this region ; 

 peristome thickened, slightly reflexed having two obsolete plaits on the inner 

 su! face ; aperture ovate; canal short; operculum horny, unguiform, with 

 an apical nucleus. 



Alt. 10.5 millim. ; diam. maj. 4.5. Aperture, alt. 3 millim. ; diam maj. 1. 



Hah. — Calcutta. 



Mupex (Oeinebpa) sykesi, n. sp. 



PI. vi, figs. 7, 8. 

 Shell ovate, solid, five varicose, coarsely ribbed and cancellated on the 

 varices, whorls 6 — 7; aperture oval; peristome produced; canal only 



