470 MR. HARPER PEASE ON POLYNESIAN LAND-SHELLS. [May 2, 



gitudinaliter tenuiter striatis, pallide fulva vel rufescenti-fusca, 

 rare indistincte fasciata ; spira conica, apice acuto, vix mucro- 

 nato ; anfr. 7, planiusculi, ultimus convexus, | longitudinis testce 

 fere cequans, basi vix attenuatus ; apertura vix obliqua, oblonga, 

 angusta, ringens, basi anguste rotandata, postice acute angulata ; 

 plica parietales 2, superior compressa, perobliqua, cum labro 

 callo juncta, altera bifida ; plica columellaris compressa, trans- 

 versa ; labrum dextrum extus incrassatum, inlus ad marginem 

 valde callosum, fort iter bidentaturn ; apertura pallida, albida. 

 Dimens. 5 X 3 vel 4 X 2 mill. 

 Hab. Insula Hawaii. 



This species is rare ; it is distinctly roundly ribbed, and the teeth 

 of the aperture are very strongly developed. It varies considerably, 

 the grooves becoming narrower and the interspaces taking a flat- 

 tened lirate shape. The grooves and striae of this and P. striata 

 are furnished with remote hairy bristles, which fall off when they 

 become dry, and are therefore seldom preserved on cabinet speci- 

 mens. The largest specimens, lirate and of a reddish colour, are 

 usually mistaken for P. striata, Phil. This species never attains to 

 the size of P. striata, and is never black. 



The species inhabiting the Island of Bourbon and registered by 

 M. Deshayes in his work on the Mollusca of that island as P. striata, 

 Phil., with a doubt, agrees with the type of the above species. I 

 find, on comparison, no characters to separate them. 



Laimodonta conica, Pse. 



Laimodonta conica, Pse. Proc. Zool. Soc. 1862, p. 242; Am. 

 Journ. Conch. 1861, p. 101, pi. 12. f. 15. 



Laimodonta anaaensis, Mouss. Journ. de Conch. 1869, p. 63, 

 pi. 5. f. 1. 



The above was originally described from specimens collected in 

 Central Polynesia. It was afterwards discovered by Mr. Garrett at 

 the Island of Annaa, where it attains to a larger size. It varies in 

 colour ; but the other characters of the shell are identically the same 

 in both localities. 



Melampus mucronatus, Gld. 



Melampus mucronatus, Gld. Proc. Bost. Soc. 1849; Rep. Am. Exp. 

 Ex. 1852, p. 204, fig. 242. 



Ellobium oryza, H. & A. Ad. Proc. Zool. Soc. 1854, p. 8. 



Auricula oryza, Pfr. Mon. Auric. 1856, p. 141 ; Novit. Conch, 

 vol. i. p. 28, pi. 7. f. 17-19. 



I have received from Annaa fifty or more specimens of M. oryza, 

 H. & A. Ad., the only species of its type inhabiting that small atoll, 

 and type specimens of M. mucronatus, Gld., from the collection of 

 the American Exploring Expedition, found at Raraka, a short dis- 

 tance from Annaa. 



The two are synonymous, although the descriptions vary. The 

 Raraka specimens have more colour, and are rather smaller. The 



