MOLLTJBCA. 69 



Hood's Island (BScluz) ; .Oomaga Eeef {Juices) ; Mauritius {Martens) ; 

 Home Islands, off Cape Grenville, N.E. Australia, and Darnley 

 Island, Torres Straits {Brazier). 



With this species N. cidaris and N. petitiana have very close 

 relationship, and, indeed, at present I cannot appreciate their points 

 of distinction. 



81. Nerita chrysostoma. 

 B4cluz ; Beeve, Conch. Icon. pi. iv. figs. 18 a, b. 



Hah. Friday and Thursday Islands, Torres Straits, and Endeavour 

 Straits, N. Australia {Goppinger) ; Philippine Islands {Cuming). 



With this species should probably be united N. Le guillouana, 

 N. savieana, iV. longii, N. aurantia (all of Eecluz), and N. funi- 

 culata, Reeve. 



82. Nerita melanotragns. 



Nerita atrata, Reeve (non Chemnitz), ConcJi. Icon. figs. 16 a, 6 ; Sutton, 

 Manual Moll. New Zealand, p. 89 ; Angas, Proc. Zool. Soe. 1865, 

 p. 175 ; op. cit. 1867, p. 212. 



Nerita nigra {Quay Sr Gaimard), Gray, Dieffenbach's New Zealand, 

 vol. ii. p. 240. 



Hab. New Zealand, common in the north, not found south of 

 Wellington {Hutton) ; Australia and Tasmania {Button) ; Port 

 Jackson {Ooppinger, Angas, ^c); Norfolk Island {BrencMey); 

 Eaoul or Sunday Island, Kermadec Islands {MacQilliway, Voy. 

 of H.M.S. ' Herald ')• 



I am inclined -with Deshayes * and Martens f to consider the shell 

 figured by Eeeve not the N. atrata of Chemnitz. That au^thor 

 describes both lips as white, whereas the species figured by Eeeve 

 has the outer lip remarkably margined with black. Besides, the 

 localities quoted in the ' Conchylien-Cabinet,' namely the coast of 

 Guinea and the West Indies, do not support Eeeve's identification. 

 It is not, however, improbable that the Nerita mentioned by 

 Chemnitz in the concluding paragraph of his description may have 

 been the N. atrata of Eeeve, for he states it to have been boug ht 

 from the South Seas by one of the expeditions under Captain Cook. 

 I cannot find any species described by Quoy and Gaimard under 

 the name N. nigra quoted by Gray in Dieffenbach's work, although 

 they figure the animal only of a Nerite noirdtre in the ' Voyage de 

 I'TJranie et la Physicienne.' The shell of that species they do not 

 describe, on account of its bad condition. The N. punctata, Q. & G., 

 from the Mauritius is placed as a synonym of the present species 

 by Mr. Angas (Proc. Zool. Soc. 1865, p. 175); but that species I 

 consider perfectly distinct, being probably the same as the N'. niger- 

 rima of Chemnitz as figured by Iteeve, which varies to a considerable 

 extent in the amount of white dotting. The spire of N. punctata 

 is described as " convexa, prominenti." The aperture is said to be 



* Anim. sans Vertebres, ed. 2, vol. Tiii. p. 603. 



t Beitrage zur Meeresfauna der Insel Mauritius uud der Seychellen, p. 292. 



