10 Scientific Proceedings^ Royal Dublin Society. 



Some specimens obtained by Professor Haddon at Deadman's 

 Island (a very small islet on the reef at the north side of Thursday 

 Island) are rather larger than usual, the finest example having an 

 ■extreme diameter of 23 millimetres. On the contrary, another 

 series which he collected at Mabuiag are so dwarfed, that at first 

 I regarded them as a distinct species. Their greatest diameter is 

 only 15 mm., and yet they are quite mature shells, having the 

 peristome properly developed. 



Habitat. — " Islands of Torres Straits, from Nogo Island on the 

 south to Warrior Island on the north" (Cox) ; "Warrior Island, 

 Bet, Sue, Cocoa-nut, Dungeness, and Darnley Islands, Cape York, 

 Thursday and Albany Islands (Brazier). 



~* Helix {Trachia) cyclostomata, Le G-uillou. 



Le Guillou, 1842, Kev. Zool. Soc. Cuv., p. 141; Cox, 

 Monogr., p. 61, pi. x., fig. 12; Brazier, Proc. Linn. Soc. 

 N. S. W., i., p. 124; Pfeiffer, Monogr. Helic, vii., p. 441; 

 Smith, 1875, Zool. Erebus and Terror., ii., p. 2, pi. iv., fig. 13 ; 

 Tryon, Manual Conch. -Pulm., iv., p. 65, pi. xiv., figs. 63, 64. 



HaUtat. — Mabuiag (Haddon). 



According to Dr. Cox, this species is widely distributed in 

 'Queensland, from Brisbane to Cape York, and in the Islands 

 of Torres Straits. 



Helix [Trachia) tucheri. 



Pfeifi'er, Symbol. Helic, iii., p. 77; Brazier, P. L. S. N. S. W., 

 i., 123; Tryon, Man. Conch., iv., p. 65, pi. xiv., figs. 63, 64; 

 H. strangidata, Hombron and Jacquinot, 1853, Voy. Pole Sud., 

 pi. IV., pp. 1-4. 



Habitat. — Albany Island, Sue, and Cocoa-nut Islands ; (Cape 

 Grreville). 



Helix [Trachia) endeavourensis. 



Brazier, 1871, Proc. Zool. Soc, p. 640 ; id., Proc Linn. Soc. 

 N. S. W., i., p. 123 ; Pfeiffer, Monogr. Helic, vii., p. 427. 

 Habitat. — Mount Adolphus Island (and Endeavour River). 



Bulimus beddomei. 



Brazier, 1880, Proc Linn. Soc N. S. W., i., p. 127; iv., 

 p. 395, unfigured. 



