VKXTM-A. nSII-LA. 181 



Mr. W. H. Pease was the first to show the variability of this 

 species, and to add to its synonymy /. francolina^ Brug (fig. 190), 

 and J. situla (fig. 188), which simply represent different stages 

 of sculpture and coloration. I have before me a specimen from 

 Rarotonga. nearly 3 inches in length, and very ponderous. 



Ixenus VEXILLA, Swaius. 



V. T^NiATA, Powis. PI. 55, figs. 184, 185. 



Brownish or chocolate, encircled by six or eight narrow, whitish 

 bands and numerous close stride. Animal bilobed in front. 



Length, •*75-l inch. 



Philippines to Pammotua ; Scmdwich Isles. 



V. VEXiLLLM, Chemn. PI. 55, fig. 186. 



Smooth ; yellowish, with six or eight narrow, brown, revolving- 

 bands. Length, -75-1 inch. 



Philippines ; Sandwich Isles. 



It is not unlikely that V. tseniata will eventually prove to be a 

 variety of this species. D'Orbigny includes this species among 

 the mollusks of Cuba, and says that the East Indies is a locality 

 given in error ; it is scarcely necessaiy to remark that he is him- 

 self mistaken ; the mollusk is not West Indian. 



Subgenus UsiUa, H. Adams. 



Founded on V. fusco-nigra., Pease, which differs from the typi- 

 cal Vexilla in the spire being acuminate, and the aperture some- 

 what contracted or narrowed. 



Pease (Am. Jour. Conch., iv, 115) adopts the subgenus, and 

 adds to it Purpura leucostoma, Desh., and Planaxis cingulata, 

 Gould. I very much doubt whether the group will stand, as the 

 little specimen of Pease's species before me is very suggestive of 

 Pisania, and Deshayes' species is a true Purpura., and evidently 

 very closely allied to. and as I believe = P. columellaris. The 

 opercula of Pease's and Gould's species are unfortunately un- 

 d escribed. 



V. PUSCO-NiGRA, Pease. PL 55, fig. 187. 



Abbreviately fu'siform, ventricose, solid ; spire moderately 

 produced, acute, and less than half the length of the shell ; whorls 

 six, convex, furnished with close, transverse, granular ribs ; 



