1916. | H. B. Preston : South Indian Moliusca. 20 
Nassodonta gravelyi, sp. n. 
Shell allied to N. insignis, H. Ad., with which it occurs, but 
differing from that species in its nar- 
rower form, external dark blackish 
brown colour and internal dark livid 
violet tinge. 
Alts-7-5, diam. maj. 4°25, diam. 
min. 3°5 mm. 
Aperture: alt. 3°5, diam. 1°5 mm. 
Hab.—Cochin backwater, near 
Ernakulam; Type (F. H. Gravely) ; 
Ennur backwater, Madras. 
At first sight this might be taken). , Me ae coenemeer alelyo 
for a variety of N. insignis, the author > "Spt ni-xe4e ; 
has, however, been able to examine a 
fairly large series of both forms, and as they never seem to blend 
he is of opinion that the one above described is quite worthy of 
specific rank. 

Family MuRICIDAE. 
Thais carinifera, Lamark. 
Anim. sans Vertébres, VII, 1822, p. 241. 
Cochin backwater, near Ernakulam; a single very immature 
specimen (fF. A. Gravely). 
Family CERITHIIDAE. 
Bittium gravelyi, sp. n. 
Shell minute, fusiform, purplish-brown, encircled by a spiral 
band of a darker colour; whorls 
6, spirally lirate, not convex; 
suture impressed; columella 
margin curved; labrum acute, 
yellowish; aperture  sub-cir- 
cular. 
pee lie 2025/0 iat: Mayne T 25 
(nearly) sonay Fic. 4.—Bittium gravelyt, spon. X 8 
Hab.—Cochin backwater, Fic. 4a.— io ee Sesculpture, 
near Ernakulam (PF. H. Gravzly). X10: 

Potamides (Tympanotonos) fluviatilis, Pot. and Mich. 
Cat. Moll. de Douar, p. 363, pl. xxi, figs. 19-20. 
Cochin backwater, near Ernakulam (F. H. Gyavenyy. 
Family TIraripDAEk. 
Tiara (Platia) scabra (Miiller). 
Hist. Verm. Il, p. 136 (as Buccinum). 
Ennur backwater, Madras. 
