509 



apertura complanata ; spira subobtecta, subterminali ; labio externo 

 margine acuto, ad latera in auriculis angulatis expanso ; labio in- 

 terno septiforini, laevigata. 



The back more rounded and elevated than in most of the patel- 

 liform species, with the apex nearly terminal, and the margin of 

 the aperture spread at the juncture of the outer and inner lips into 

 angular auricles. The species bere figured agrees much better with 

 the figure in the ' Encyclopedic Methodique,' quoted by Lamarck, 

 than the one figured in the Conch. Illust., which M. Deshayes 

 has named 2V. Lamarckii. 



New Holland. 



6. Neritina vespertina (pi. cxiii. f. 131, 132), Nuttall. 



N. testa N. auriculatce, simih, sed dorso multiim magis depresso, 

 auriculis late expansis. 



Like N. auricidata (Sp. 5), but much more depressed, and 

 having the auricles very broadly expanded. 



" Sandwich Islands ; on stones in small streams." 



7. Neritina Tahitensis (pi. cxiii. f. 133, 134), Lesson. 



N. testa, N. auricidata, simili, sed auriculis rotundatis. 

 Differing from N. auricidata (Sp. 5) in having the auricles 

 rounded, so as to give the entire aperture a more oval form. 

 Tahiti; on stones in small streams. Cuming. 



8. Neritina bicanaliculata (pi. cxiii. f. 135, 136, 137), 

 Recluz, MS. Mus. Cum. 



N. testa N. auriculatce simiH, sed magis transverse elongata, 

 magis patelliformi, columella septiformi magis elongata; apice 

 terminab; auriculis canaliformibus. 



More patelbform and depressed than N. auricidata (Sp. 5), 

 with the apex quite terminal. The auricles at the juncture of the 

 inner and outer bps are narrow and hollow. 



" Island of Luzon ; on stones in small ponds." Cuming. 



9. Neritina crepidularia (pi. cxiii. f. 139-144), Lamarck. 

 N. Touranensis, Souleyet. N. violacea, Gtnel. ? N. melanostoma, 

 Troschel, Phil Abbild. und Besch. Conch., t. i. f. 13. 



N. testa transverse ovali, epidermide induta, plerumque pallide 

 fulva, fasciis et lineis fuscis vel violaceis reticulata ; spira brevissima, 

 anfractu singulo subobtecto; apertura magiiEi, carneola, vel violacea; 



3 u 



