OF NEW SOUTH WALES. 79 



strong plaits turned back over the front of the last whorl, above 

 with one prominent callus like tooth, joined to the upper part 

 near the suture, aperture small, auriform ; outer lip thickened 

 and reflected, having in the centre a prominent tubercular 

 callosity, with a minute one below near the region of the small 

 canal. 



Length £ diam., maj. -| lin. 



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

 Only two specimens of this minute and interesting species were 

 found. 



Family APLUSTKED^E. 



19. — Aplu strum Thalassiarchi. 



Bulla Thalassiarchi, Martini, Chemn., p. 146, fig. 1350, 1351. 



„ amplustre, Linn. Sysfc., Nat., p. 1184. 



„ aplustre, Lam. Anim. Sans, Vert, tome 6, part 2, p. 

 35. 



„ amplustre, Hanley, Ipsa. Linnaai. Conchylia, p. 206. 



„ „ Wood, Index. Test., pi. 18, fig. 26. 



Aplustra pulchella, Swainson, Malacology, p. 248. 



Aplustrum Thalassiarchi, Sowerby, Thes. Conch., vol. 2, p. 

 564, pi. 120, figs. 4, 5, 6. 



Aplustrum aplustre, Cheuu, Manuel de Conch., part 1, p. 286, 

 fig. 2905. 



„ fasciatum, Schumacher. 



Hab. Bramble Cay, on the outer Great Barrier Reef, North 

 Fast Australia, on the sands at low water ; Aneiteum, New 

 Hebrides ; New Caledonia. (Brazier.) 



Family CYLICHNID^E. 



20. — Cylichna arachis. 



Bulla arachis, Quoy et Gaimard, Voy. de 1' Astrolabe, tome 2, 

 p. 361, pi. 26, f. 28, 30. 



„ „ (Cylichna), Sowerby, Thes. Conch., vol. 2, p. 



591, pi. 133, 134 



