OF NEW SOUTH WALES. 313 



least If lines. Two specimens obtained off Katow, New Guinea, 

 much smaller, both dead and somewhat seaworn. 



7. — Trichotropis gracilenta, n. sp. 



Shell turrited, thin, transparent, umbilicated, smooth; whorls 5|-, 

 flatly spirally angled, three-keeled, one on the angle, one in the 

 centre, and one above the suture, studded with close set, obtuse, 

 nearly obsolete spines ; spire acuminated ; apex white, shiny, 

 smooth, rounded, umbilicus narrow, with a small keel bordering 

 the edge; aperture nearly rounded; columella slightly tortuous, 

 acuminated at the lower part. 



Length, 2f ; breadth, 1J ; least, 1 line. 



Hob. Darnley Island, Torres Straits, 30 fathoms, white sandy 

 mud bottom. One specimen found (Brazier). 



There are thirteen species of Trichotropis at present known, 

 namely T. Cedo-nulli, A. Ad.; bicarinata, Brod. and Sower by ; uni- 

 carinata, Brocl. and Sowerby ; quadricarinata, A. Adams — all from 

 Japan ; Borealis, Brod. and Sowerby, Behring's Straits, Greenland 

 and North Britain ; msignis, Middendorf, Behring's Straits ; can- 

 ceUata, flavidula, biennis, Hinds, Sitka, North West Coast of 

 America ; Ruzcri, Phillippi, Spitzbergen ; conica, Muller, Green- 

 land ; costellata, Couthouy, North America ; clathrata, A. Adams, 

 New Zealand, on the authority of Mr. A. Adams. The present 

 two new species from Australia bring the number up to fifteen. 



Family Cerithiid,e. 



Sub-family Cerithiin^e. 



8. — Cerithium nodulosum. 



Cerithium nodulosum, Brng. Diet. No. 8. 



„ ,, Lam. Anim. Sans Vert., tome 7, p. 67. 



,, nodulasa, Cathow, Conchologists' Nomenclator, p. 227. 

 ,, nodulosum, Sowerby, Thes. Conch., vol. 2, p. 854, 



pi. 178, tig. 42. 



Murex tuberosus, Dillwyn. Murex nodulosus, Wood. 

 Hub. Darnley Island, Torres Straits, found on sandy mud Hats 

 inside the reefs. 



