1 887.] MOLLUSKS OF THE VITI ISLANDS. 301 



I have been enabled to examine typical specimens of T. cerea and 

 T. nitidn labelled in Gassies's own handwriting, and do not hesitate 

 to refer the former to the smooth crenulated and the latter to the 

 smooth non-crenulated varieties of T. ceylanica. 



4. Truncatella granum, Garrett. 



Truncatella granum, Garrett, Amer. Journ. Conch. 1872, p. 225 ; 

 Schmeltz, Cat. Mus. Godeff. v. p. 105 ; PfeifFer, Mon. Pneum. iv. 

 p. 16. 



This small species occurred to my notice in one locality only, the 

 N.E. end of Taviuni, where it was found abundant beneath loose 

 stones a little below high-water mark. 



Its small size (4| to 5 millim. long), uniform cinereous colour, 

 4| persistent whorls, 20 to 25 riblets on the body-whorl, small ovate 

 aperture, and conspicuous duplicated peristome will distinguish it 

 from the preceding species. 



5. Truncatella avenacea, sp. nov. 



Shell small, rimate, cylindrical, corneous ; ribs rather small, erect, 

 rounded, about the same width as their interspaces, 35 to 40 on the 

 last whorl; suture impressed ; whorls persistent, 4|, convex; base 

 distinctly carinated ; aperture small, vertical, oval, a little less than 

 a fourth the length of the shell ; peristome continuous, obtuse, 

 slightly expanded, and duplicated by the continuation of the basal 

 keel. Length 6, diam. 2k millim. 



A few examples found associated with T._ vitia,na at Vanua Levu. 



It more nearly resembles the strongly rib.bed T. semicostata than 

 any other species inhabiting the group ; but may be distinguished 

 from that species by its more numerous ribs, more convex whorls, 

 smaller aperture, and more conspicuous basal keel and duplicated 

 peristome. 



Genus Taheitia, H. & A. Adams, 



1. Taheitia funiculus (Mousson), 



Truncatella funiculus, Mousson, Journ. de Conch. 1870, p, 171 ; 

 Paetel, Cat. Conch, p. 117; Pteiffer, Mon. Pneum. iv. p. 21. 



This species was discovered by Dr. Griiffe in the interior of Viti 

 Levu. 



It is a slender, cylindrical, whitish horn-coloured species, with 6 

 persistent convex whorls and a deep suture ; the ribs are sharp, rather 

 remote, 12 to 16 in the body-whorl, all converging at the base. The 

 aperture is small, vertical, semicircular. Peristome obtuse, expanded, 

 continuous, and shghtly porrected. Length 8, diam. 2 millim. 



2. Taheitia turricula (Mousson). 



Truncatella turricula, Mousson, Journ. de Conch. 1870, p. 196; 

 Paetel, Cat. Conch, p. 1 17 ; Schmeltz, Cat. Mus. Godeff. v. p. 104 ; 

 Pfeiffer, Mon. Pneum. iv. p. 20. 



Inhabits Mango Island, where it was discovered by Dr. Griiffe. 

 I do not know this species. 



Proc. Zool. Soc— 1887, No. XXI. 21 



