1887.] MOLLUSKS OF THE VITI ISLANDS. 305 



Genus MoussoNiA, Semper. 



1. MoussoNiA FuscuLA, Mousson. 



Diphmmatina (JSIoussonia) fuscula, Mousson, Journ. de Conch. 

 1H70, p. 188, pi. 8. fig. 9 ; Pfeiffer, Men. Pneum. iv. p. 93. 



Moussonia fuscula, Paetel, Cat. Concb. p. 102. 



Tlie type was found by Dr. Griiffe on Oneata, one of the Windward 

 Islands. Prof. Mousson mentions a var. viliana from Viti Levu. 



It is a minute, dextral, abbreviately turreted species of a brownish 

 horn-colour, with fine striae and 7 rounded whorls, of which the 

 penultimate is the larger. The body-whorl is rather slender, 

 rounded, and ascending. The aperture is circular, and the columella 

 bears an obtuse plait or tooth. Peristome expanded. Length 

 2 millim. 



Genus Ostodes, Gould. 



1. Ostodes diatretus (Gould). 



Cyclostoma diatretum, Gould, Proc. Bost, Soc. Nat. Hist. 1847, 

 p. 205 ; Expl. Exp., Shells, p. 105, fig. 124. 



Cyclotus diatretus, Pfeifter, Consp. Cyclos. no 22 ; Mon. Pneum. 

 i. p. 33 ; Gray, Cat. Phan. p. 18. 



Cyclophorus (Ostodes) diatretus, var. intercostata, Mousson, 

 Journ. de Conch. 1870, p. 179. 



Dr. Gould's type specimens of this rare species were found on the 

 west end of Vanua Levu. I obtained two dead specimens at Vanua 

 Balavo, one of the Windward Islands, where Dr. GriifPe also found 

 a single dead example, and one on Oneata, which Prof. Mousson 

 characterized as var. irdercostata. 



This species is readily distinguished by its depressed form, wide 

 open umbilicus, rude spiral, unequal, elevated lines, whitish horn- 

 colour, rounded aperture, and simple peristome. Diam. 12 millim. 



It is very closely related to the New-Caledoniau O. bocayeanus, 

 but is smaller and more depressed. 



Whilst searching in the mountains on the west end of Vanua 

 Levu I found a very much weathered Ostodes twice the size of 

 Gould's s[)ecies, and subsequently found a similar specimen on the 

 beach at Kioa Island. The specimens are in the Museum Godeffroy 

 in Hamburg, It is undoubtedly an undescribed species. 



2. Ostodes liberatus, Mousson. 



Ostodes liberatus, Mousson, MS., Mus. Godeffroy, 1885. 



Shell widely umbilicated, depressed, whitish horn-colour ; spire 

 slightly elevated; apex prominent; suture deeply impressed; 

 whorls 4, convex, transversely rudely striated, undulated, and 

 sculptured with numerous elevated spiral lines, larger, more promi- 

 nent, and crenulated on and above the rounded periphery; umbilicus 

 very wide, showing all the volutions to the apex ; aperture circular, 

 nearly vertical ; peristome thin, continuous, straight. 



Major diam. 10, height 4 millim. 



Viti Levu. 



