1887.] MOLLUSKS OF THE VITI ISLANDS. 309 



Realia (Omphalotropis) perforata, Mousson, Journ. de Conch. 

 1871, p. 27; Pfeiffer, Mon. Pneum. iv. p. 222. 



The type specimens of O. zebriolata and O. perforata were found by 

 Dr. Griiffe at "Uvea" or Wallis Island, one of the northern islands of 

 the Tonga group. Having personally collected hundreds of examj)les 

 of both forms in the same locality, and as they gradually intergrade, 

 I have united the two species. Dr. Griiffe also detected it on the 

 neighbouring island of Futuna and on the low coral-islands of Ellis 

 group. He likewise obtained the form O. zebriolata at Kanathia, Yiti 

 Islands. Mr. Pease wrongly assigns it to Samoa. 



It may be distinguished by its ovate-conical form, smooth surface, 

 fissured base, and variable colour — rose-red, pale luteous, violaceous 

 brown, often pale banded at the periphery; sometimes with pale dots 

 or longitudinal flexuous or zigzag lines. The basal keel is contiguous 

 to the umbilical fissure. The pyriform aperture is usually coucolor 

 and the glazed parietal wall is frequently reddish brown. Length 

 f) to 7 millim. 



It is shaped like the well-known O. huahinensis. 



9. Omphalotropis rosea (Gould). 



Cyclostonia roseum, Gould, Proc. Bost. Soc. Nat. Hist. 1847, 

 p. 2U5 ; Expl. Exp., Siiells, p. lO.i, fig. 121 ; Petit, Journ. de Conch. 

 18.50, p. 47. 



Omphalotropis rosea, Pfeiffer, Proc. Zool. Soc. 1854, p. 307 ; 

 Consp, Cyclos. no. 47; Mon. Pneum. i. p. 308, iii. p. 176; H. & 

 A. Adams, Gen. Moll. ii. p. 300. 



Hydrocena rosea, PfeifFer, Mon. Pneum. ii. p. Ifj2. 



Assiminea rosea. Martens, Ann. & Mag. Nat. Hist. 1866, xvii. 

 p. 206. 



Through the kindness of Mr. E. L. Layard, I have received an 

 adolescent example of Gould's 0. rosea ; but, unfortunately, the 

 kind donor cannot give me any information in regard to the exact 

 locality except the comprehensive one " Fiji." I am inclined to 

 believe it inhabits the small AVindward Islands. 



It may be distinguished by its large size, elongate-conical shape, 

 rather solid texture, 6—7 whorls, and rose or luteous horn-colour. 

 The conspicuous basal keel is close to the slightly perforated 

 umbilicus. Length y-9, diam. 4|-5 millim. 



10. Omphalotropis bifilaris, Mousson. 



Omphalctropis hijiluris, Mousson, Journ. de Conch. 186.5, p. 183 ; 

 Pease, Journ. de Conch. 1869, p. 146; Proc. Zuol. Soc. 1871, 

 p. 476 ; Paetel, Cat. Conch, p. 124 ; Schmeltz, Cat. Mus. Godeff. v. 

 p. 101. 



Realia {Omphalotropis^ bifilaris, 'M.oyxssow, Journ. de Couch. 1869, 

 p. 353, 1870, p. 194 (var. angusta), 1871, p. 29; Pfeiff"er, Mon. 

 Pneum. iv. p. 232. 



Obtained by Dr. Griiffe at Kanathia, and the var. angusta in the 

 interior of Viti Levu. The latter has a smaller basal fissu.e, and the 



