NERITA. 985 



Fariefij B. Of a yellowish brown colour, wiili the aperture 

 white, the outer lip thickish, and the umbilicus open. 

 Mamma Veneris fuscata. Chemnitz, v. p. 282. t. 189. f. 



1932 and 1933. 

 Le Mammelon, ou Teton brun de Venus. Favanne, ii. p. 



285. t. 11. f. H4. 

 Lister Conch, t. 5G6. f. 14. Know, iv, t. 8. f. 4. Seha, 

 iii. t. 38. f. 32 and 3'3. Geve, t. 28. f. 30G. 



Fariety C. Smaller, white, and the umbilicus partly open. 

 Nerita nitida. Donovan, iv. t. 144. Montagu Snpp. p. 149. 

 Nerita Mammilla. Maton and Racket, in Lin. Trans, viii. 

 p. 225. 



Inhabits the coasts of Alexandria. Linnceus. Barbadoes and 

 Jamaica. Lister. Amboyna. Rumphins. Red Sea. For- 

 skael. Moluccas, Isle of France, Madagascar, and Cape of 

 Good Hope. Favanne. Tranquebar. Chemnitz. 



Shell varying from an inch to an inch and three-quarters in 

 length, and more than two-thirds as broad, thick, very glossy, 

 most commonly of a snow-white colour, or sometimes yel- 

 lowish brown ; the spire is small, but somewhat produced 

 and pointed ; a large vitreous mass extends from the upper 

 end of the pillar-lip, and generally wholly fills up the umbi- 

 licus, especially in oriental specimens, while in those from 

 the West Indies, the umbilicus is commonly open, or at 

 most only partially closed. Both Chemnitz and Favanne 

 considered the Variety B to be a distinct species ; but other 

 authors have entertained a contrary opinion, and the two 

 shells approach each odier so intimately, that 1 have not 

 ventured on separating them. 



PAPILLA. 18. Shell oblong, thin, j3ellaci(], of a 

 dirty yellow-colour with decussated striee, 

 and the aperture sub-oval ; ])illar white, and 

 the umbilicus partially closed. 



Nerita Papilla. Gmelin, p. 3675. Schreibers Conch, i. 



p. 321. 

 Nerita, No. 25. Schroeter EinL ii. p. 313. 

 Papilla seu Ruma Felis. Chemnitz, v. p. 285. t. 189. f- 



1939. 

 Le Teton de Chat. Favanne, ii. p. 177, and p. 292. 



Plentiful on the coasts of Tranquebar. Chemnitz. New Zea- 

 land. Favanne. 



Shell about thirteen lines long and ten broad, with four whirls, 

 and of a dirty yellowish colour ; Favanne considered it to be 



