118 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



Helix impexa, Reeve Conch Icon, 1852, sp. 795. 



,, Crotali, Cox, Catalogue of Australian Land Shells, 1864, 

 p. 18. 



,, rustica, Cox, Monog. Aust. Land Shells, 1868, p. 2, pi. 



9, fig. 3. 



Hab. Barrow and Palm Islands, North-east Coast of Australia. 



2. — Helix (Thalassia) Yorkensis. 



Helix Yorkensis, Pfr. Proc Zool, Soc, 1854, p. 145. 

 Pfr. Mon. Helic Viven, 1859, p. 29. 

 ,, ,, Reeve, Conch Icon, 1854, sp. 1372. 



,, ,, Cox, Monog. Aust. Land Shells, 1868, p. 31, 



pi. 9, fig. 8. 



Hab. Cape York, North Australia; also Palm Island, North- 

 east Coast. 



3. — Helix (Thalassia) villaris. 



Helix villaris, Pfr. Proc. Zool. Soc, 1854, p. 146. 

 „ Pfr. Mon. Helic Viven, 1859, p. 47. 

 ,, ,, Reeve, Conch Icon.. 1854, sp. 1375. 



,, ,, Cox, Mcnog. Aust. Land Shells, 1868, p. 2, pi. 



10, fig. 8. 



Hab. Cape York and Albany Island, North Australia. 



4. — Helix (Thalassia) Kreffti. 



Helix Kreffti, Cox, Catalogue of Australian Land Shells, 1864' 

 p. 21. 



„ Pfr. Mon. Helic Viven, 1868, p. 243. 



Helix villaris, Cox, Non-Pfr. Monog. Aust. Land Shells, 1868, 

 p. 2. 



Hab. Darnley Island, Torres Straits. 



This species is larger than Helix villaris Pfr. The original 

 specimens of Helix Kreffti in Dr. Cox's collection, though said to 

 come from Cape York, are I believe, really from Darnley Island. 



