312 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



4. — Cancellaria (Trigonostoma) LAMELLOSA. 



Cancellaria lamellosa, Hinds, Proc. Zool. Soc, London, 1843, 

 p. 49. 



„ „ Sowerby, Thes. Concli., vol. 3, p. 453, 



pi. 94, fig. 47 ; pi. 96, fig. 100. 



Hob. Darnley Island, Torres Straits, 15 fathoms, sand bottom. 



5. — Cancellaria (Trigonostoma) obliquata. 



Cancellaria obliquata, Lam. Anim. Sans Vert., tome 7, p. 115. 

 ,, „ Sowerby, Thes. Conch., vol. 2, p. 453, pi. 96, 



fig. 83. 



Hah. Palm Island, North-East Coast of Australia, 8 fathoms, 

 mud bottom ; Darnley Island, Torres Straits, 30 fathoms, sandy 

 bottom. 



Family Trichotropid^e. 



6. — Trichotropis tricarinata, n. sp. 



Shell somewhat conical, whity-brown, deeply umbilicated ; 

 strongly three-keeled at the periphery, the keel at the angle run- 

 ning into the suture, keels showing faint minute spicules (only 

 seen with the lens) ; whorls 4|, somewhat tabled, the last large 

 and angled above in front, spire rather more than half the whole 

 length, apex smooth, white ; umbilicus wide, bordered with a broad 

 keel, which forms the outside of a very narrow canal at the base ; 

 columella narrow, thin, straight ; aperture squarely ovate ; peristome 

 continuous, divided by a small passage between the body whorl, 

 slightly expanded at the base. 



Length, 2| ; breadth, 2\ ; least, If line. 



„ H; „ if; „ l£lme. 

 Hab. Bet Island, Torres Straits, 1 1 fathoms, white sandy mud 

 bottom ; off Katow, New Guinea, 7 miles ; bottom sand and mud, 

 8 fathoms. This species differs from any of the known Tricho- 

 tropis by its large and open umbilicus somewhat like T. unicarinata, 

 (Sowb.), the lip being continuous and divided from the body whorl 

 by a small narrow passage. Only one speciman found at Bet 

 Island, Torres Straits, it being 2f lines long, 2\ lines in breadth, 



