OF NEW SOUTH WALES. 81 



The apex of this beautiful little species is quite depressed or 

 truncated, and the umbilicus of the apex sunk deep down, some- 

 what allied in sculpture to Cylichna decussata. 



25. — Mnestia bizona. 



Bulla bizona (Cylichna), A. Adams, in Sowerby, Thes. 

 Conch., vol. 2, p. 597, pi. 125, fig. 148. 



Hab. Darnley Island, Torres Straits, 15, 20, 30 fathoms, 

 sandy mud; Princess Charlotte Bay, North East Australia, 13 

 fathoms, sand ; Evans' Bay, Cape York, North Australia, 6 

 fathoms, sand. 



This species is variable in colour, some specimens being 

 fulvous, with two encircling bands of a light yellow, others again 

 all white, and covered with a pale yellow epidermis, and encircled 

 with two reddish brown, nearly obsolete lines, others not having 

 any bands whatever. It appears to be a plentiful species at 

 Darnley Island, something like two hundred were obtained 

 during five days that dredging was carried on. And with one 

 haul of the dredge only single specimens were obtained at the 

 other two localities. 



26. — Mnestia granosa n. sp. 



Shell small, ovate, light straw yellow, varigated with two 

 nearly obsolete white bands, in some specimens not 

 visible, contracted above, produced and rather acumi- 

 nate below ; longitudinally and transversely rugosely striated, 

 interstices smooth, the whole surface of the shell having the 

 appearance of somewhat square-like grains, spire conspicuous 

 in the deep umbilicus of the apex, outer margin of the umbilicus 

 white and very rugose ; aperture narrow, acuminately produced 

 and thickened above, slightly produced below ; columella 

 thickened, straight, slightly reflected, umbilicus minute, with a 

 white margin, peristome moderately inflexed. 



Length 2 lines, breadth 1 lin. 



Hab. Darnley Island, Torres Straits, 30 fathoms, sandy mud. 

 The whole surface of this species is covered with series of small 

 grains, after the style of a double cut file. 



