728 MR. E. A. SMITH ON NEW SHELLS FROM [Julie 18, 



15. Descriptions of five new Shells from the Island of For- 

 mosa and the Persian Gulf, and Notes upon a few known 

 Species. By Edgar A. Smith, F.Z.S. 



[Eeceived June 18, 1878.] 

 (Plate XLVI.) 



Melania formosensis. (Plate XLVI. figs. 4 & 5.) 



Shell elongate, subulate, olivaceous yellow, purer yellow beneath 

 tbe whorls, marked with longitudinal, undulating, more or less in- 

 terrupted and broken flammules of a dark brown colour, at the top of 

 the whorls forming conspicuous blotches, and at the base of the 

 body-whorl with a broad blackish-brown band. Wborls 13, a little 

 constricted at the upper part and submarginated and somewhat 

 convex beneath, the first 9 or 10 obliquely costate and deeply 

 transversely sulcate, the lowermost sulcus at the suture being par- 

 ticularly wide, forming a caualiculatiou, the last three whorls only 

 spirally sulcate and striated by obliquely flexuous lines of growth ; 

 sulci narrower than the interstices, about 10 in the penultimate 

 whorl and 24 in the last. Aperture ovate, acute superiorly, within 

 of the same colour as the exterior, but clouded by a white enamel, 

 the brown flammulation and spiral basal band being visible ; colu- 

 mella white, oblique, but slightly arcuate. 



Length 33 millim., diameter 9i ; aperture 9| long, 5 wide. 



Var. In this variety the longitudinal plicse extend as far as the 

 penultimate whorl, and are even partially developed on the last. 



Hab. Formosa {Dickson). 



This species, which I feel much pleasure in naming after Mr. 

 Matthew Dickson, has been liberally presented to the Museum by 

 him, together with the other Melaniae here described, and a nu- 

 merous series of insects. 



Melania dicksoni. (Plate XLVI. fig. 6.) 



Shell elongate, acuminate', shining, olivaceous yellow, purplish 

 brown at the apex, with or without spiral brown bands. Whorls 8 

 or 9, moderately convex, the six upper ones almost smooth, only 

 finely striated longitudinally by lines of growth, and also trans- 

 versely, the last two with a few faint transverse keels or ridges. 

 Aperture ovate, acuminate above, occupying nearly 4 of the entire 

 length, white within, the brown bands of the exterior (when present) 

 also visible. Lip thin, almost even, not prominent or sinuated ; 

 columella rather thickly callous in the umbilical region, and united 

 to the lip above by a very thin callosity. 



Length 21 millim., diameter 8 ; aperture 8£ long, 5 wide. 



Hab. Formosa (Dickson). 



This is a very remarkable species, and looks more like a North- 

 American than an Eastern form. 



The brown transverse bands are present in five out of the six spe- 



