II 



DESCRIPTIONS OF TWO NEW SPECIES OF MARGINELLA 

 FROM SAN THOME ISLAND. 



By J. R. LE B. TOxMLIN, M.A., and L. J. SHACKLEFORD. 



(Read before the Society, Sept. nth, 1912). 



Plate I (delayed till next number). 



Marginella eveleighi n.sp. 



Shell somewhat stout, fusiform, shining, white, very finely longitu- 

 dinally striate ; aperture long, narrow ; posterior canal somewhat 

 deeply notched ; columella strongly four-plaited, the two posterior 

 plaits almost straight, the anterior ones very oblique ; outer lip 

 incrassate, broadly margined, rather coarsely denticulate within. Spire 

 rather short, four to five whorled, the apical whorls being vitreous. 

 The suture is well-marked and flattened. The body-whorl is orna- 

 mented with eight or nine transverse brown lines continued to the 

 margin and crossed by six undulating longitudinal lines, broadening 

 every now and then into blotches. These also are of a chocolate 

 brown and there are irregularly shaped triangular blotches of the 

 same colour on the upper whorls. The base of the anterior canal is 

 also slightly stained with brown. 



Long., 7*25 mm. ; diam. max., 4 mm. 



Hab. : S. Thom^ Island, Gulf of Guinea. Scarce, in coral gravel. 



This shell is named after the Rev. G. S. C. Eveleigh, of St. Vincent, 

 C.V., who has rendered us good service in getting West African 

 material. 



M. melvilli n.sp. 



Shell fusiform, elongate, shining, smooth; sjnre blunt, three to four 

 whorls; suture hardly apparent ; aperture narrow at posterior end, 

 and broadened at the anterior end. Columella strongly four-plaited, 

 the two posterior plaits being nearly straight, the third slightly, and 

 the fourth — the anterior plait — very oblique. Outer lip pure white, 

 incrassate, and very slightly arcuate with fine sage-green markings 

 across the margin, which is somewhat broad. The body-whorl is 

 ornamented with two scalloped bands of clouded brown of varying 

 tints, the tips of the projections being of a deeper brown. Between 

 these two coloured bands at a little below the level of the posterior 

 canal, the pure porcelain white of the ground colour of the shell 

 shows as an apparent white band scalloped on each border. On the 

 penultimate whorl the colour of the band becomes sage-green — the 

 tips of the projections only being brown. 



Long., 8-9 mm. ; diam. max., 4-5 mm. Hab. : S. Thome, very rare, 



