144 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



Hah. Cape Grenville, North-East Australia, found on the 

 beaoh. 



This species is thicker, wider at the aperture, more nearly all 

 white, and more depressed round where the umbilicus should be 

 than Nautilus pompilius, Linn. The vast number of specimens 

 which I have seen from Torres Straits of N. arribiguus are all of 

 one character. 



3. — Nautilus stenomphalus. 



Nautilus stenomphalus, Sowerby Thes. Conch., vol. 2, p. 465, 

 pi. 97, fig. 3 ; Reeve Conch. Icon., pi. 5, sp. 4. 



Hab. Darnley Island, Torres Straits ; Aneiteum, New Hebrides 

 (Brazier.) 



Class PTEROPODA. 

 ORDER THECOSOMATA. 



Family CAVOLINID^E. 

 4. — Cavolina quadridentata. 



Hyalcea quadridentata, LesueurVoy. Bonite, Moll. t. 4, fig. 25, 

 32 j Desh. ed. Lam. Anim. Sans. Vert, tome 7, p. 419. 



Hah. Darnley Island, Torres Straits, 30 fathoms, 1 specimen 

 found. 



5. — Cavolina longirostra. 



Hyalcea longirostris, LesueurVoy. Bonite, Moll. t. 5, fig. 7, 13 ; 

 Desh. ed. Lam. Anim. Sans. Vert, tome 7, p. 420. 



Hab. Princess Charlotte Bay, North-East Australia, 13 fathoms ; 

 Darnley Island, Torres Straits, 30 fathoms. 



A vast quantity of this species was obtained at both the above 

 localities ; they appear to fall from the surface of the ocean to 

 the bottom of the sea bed. 



Class HETEROPODA. 



Family Macgillivrayiid^. 



7. — slnusigera microscopica. 



Struthiolaria microscopica, Gray in Voyage of the Blossom. 



Cheletropis Euxleyi, Forbes in Voyage of the Rattlesnake, vol. 



2, p. 385, pi. 3, fig. 9a. 9b. 



