1887.] MOLLUSKS OF THE VITI ISLANDS. 295 



Genus Plecotrema, H. & A. Adams. 



1. Plecotrema souverbiei, Montrouzler. 



Plecotrema souverbiei, " Montrouzier," Souverbie, Journ. de 

 Conch. 1S62, p. 24G, pi. 9. fig. 12 ; Gassies, Faune Nouv. Cale'd. 

 p. 67, pi. 6. fig. 23 ; Pt'eiffer, Mon. Pueum. (Auric.) iv. p. 343. 



Plecotrema turrita, Garrett, Proc. Phil. Acad. Nat. Sci. 1873, 

 p. 235, pi. 3. fig. 68. 



Not uncommon under stones a little below high-water mark on 

 the east end of Taviuni. It also inhabits New Caledonia. 



This remarkable species is easily recognized by its ovate-conical 

 form, scalariform spire, corneous or dull fulvous colour, subper- 

 forated and angulated base. The sculpture consists of numerous, 

 small, crowded, granulated spiral ridges, with the intermediate 

 grooves crossed by sublaminated striifi. There is a prominent crest- 

 like varixjust behind the peristome, which latter is acute, continuous, 

 and slightly porrected. Parietal region with a superior nodiform 

 tooth beneath, of which there is a simple acute plait. Columellar 

 fold small and nearly transverse. Outer lip labiate within aud 

 bidentate. Length 4| millim.. 



Very closely allied to, if not identical with, P. bella, a Philippine 

 species. 



2. Plecotrema hirsuta, Garrett. 



Plecotrema hirsuta, Garrett, Amer. Journ, Conch. 1872, p. 219, 

 pi. 19. fig. 2 ; Schmeltz, Cat. Mus. Godeff. v. p. 87 ; Pfeiffer, Mon. 

 Pueum. (Auric.) iv. p. 348. 



Abundant in the same station and locality as the preceding 

 species. 



An imperforated, solid, acutely-ovate, corneous species, with spiral 

 rugose lirse, 16 to 18 on the body-whorl, garnished with short, 

 deciduous, curved hair-like setse. The intervening sulcations deep, 

 narrower than the lirations, and crossed by sublaminated striae. 

 There is a stout obtuse varix just behind the peristome, and the 

 dentation, excepting the lower parietal fold, which is bifid, does not 

 differ from the preceding species. Length 5 to 7 millim. 



3. Plecotrema octanfracta (Jonas). 



Pedipes octanfracta, Jonas, Zeit. Malak. 1845, p. 160. 



Plecotrema octanfracta, Jerkeli, Nachr. Malak. Ges. 1872, p. 65 ; 

 Pfeiffer, Mon. Pneum. (Auric.) iv. p. 34G. 



Plecotrema cluusa, H. & A. Adams, Proc. Zool. Soc. 1853, p. 121 ; 

 Gen. iMoU. ii. p. 241. ; Pfeiffer, Syn. Auric, no. 101 ; Novit. Conch. 

 i. p. 15, pi. 5. figs. 9-11 ; Mon. Auric, i. p. 103 ; Pease, Proc. Zool. 

 Soc. 1871, pp. 4;"j9, 477; Paetel, Cat. Conch, p. 144; Schmeltz, 

 Cat. Mus. Godeff. v. p 87. 



Plecotrema coasobrina, Garrett, Proc. Phil. Acad. Nat. Sci. 1873, 

 p. 236, pi. 3. fig. 69. 



Not uncommon under stones a little below high-water mark at Kioa 



