319 



JOURNAL OF CONCHOLOGY. 



Vol. 13. JULY, 1912. No. n. 



DESCRIPTIONS OF TWO NEW SPECIES OF MARGINELLA 

 FROM SAN THOME ISLAND. 



By J. R. LE B. TOMLIN and L. J. SHACKLEFORD. • 



(Read befoie the Society, May 8th, 1912). 



Plate 4. 



Marginella dautzenbergi n.sp. (pi. 4, figs, i and 2). 



Shell obtusely ovate, smooth, polished, and very shining, yellowish 

 or whitish, with six regular rows of dark red-brown spots on the 

 body-whorl, the spots being at some distance apart, and at equal 

 intervals. Reckoning from the apex, in the second and fourth rows 

 the spots are generally somewhat lighter in colour than those in 

 the other rows, and in worn specimens disappear entirely, giving 

 the appearance of a four-banded shell instead of six-banded. In the 

 mouth of specimens in good condition the spots can be seen shewing 

 through. Spire very slightly or not at all raised above the summit 

 of the outer lip ; protoconch very blunt, often completely covered by 

 a callus which is a continuation of the outer lip ; whorls 4^ in 

 number ; suture slight, marked by a narrow band of the same colour 

 as the spots on the body-whorl ; aperture elongate, narrow ; outer 

 lip strongly thickened, finely denticulate within, in some cases two- 

 or three-spotted in continuation of certain of the rows of spots, 

 sometimes continuing above in the form of a callus as far as the 

 apex of the spire ; columella with six to eight plaits. 



Long., 6*25 mm. ; diam. max., 3*5 mm. 



Hab. : S. Thome Island, Gulf of Guinea. Not uncommon in coral 

 gravel. 



This species reminds one a good deal of M. debnrghice A. Ad. on a 

 small scale, and the spots are of the same character, but of a browner 



colour. 



u 



