94 CHICOREUS. 



I have before me specimens, however, which are very suggestive 

 of its derivation from the t} 7 pical Senegalensis. 



M. SENEGALENSIS, Gmel. PI. 16, fig. 159 ; pi. 17, figs. 168, 169. 



Body superiorly angulated, and armed on the varices with a 

 single, more or less produced spine, not frondose ; varices 

 nodose, but usually not spinous elsewhere ; inter-ribs usually 

 two or three, whitish or brownish ; generally, in fresh specimens, 

 banded with brown ; aperture varying from flesh to chocolate 



color. Length, 1*5-2 inches. 



Senegal, Bio Janeiro. 



I have a good suite of specimens which enables me to connect 

 satisfactorily M. calcar with this species ; it may be designated 

 as a variety, 



VAR. CALCAR, Kiener (fig. 169). 



The shell is whitish, with fimbriately-laminated varices bear- 

 ing, superiorly, a long spine, which is not frondose. Length, 

 2-3'5 inches. 



Senegambia. 



M. pliciferus, Sowb. (fig. 168), is apparently the same as M. 

 calcar ; it was described from a single specimen in the Cumin- 

 gian collection. 



M. GUBBI, Reeve. PI. IT, fig. 167. 



Of triangular fusiform shape, compressed on the lower part of 

 the body; with slight spines except around the shoulder, where 

 they are well developed. The aperture is toothed within, and 

 white; the rest of the shell blackish-brown. Length, 1-75-2*5 

 inches. 



W. G. Africa. 

 M. OAPUCTNUS, Lam. PI. 19, fig. 174. 



Shell narrow, with elongated spire ; varices thick, depressed, 

 fimbriated but not spinous, or but slightly so ; with nodulous, 

 revolving, elevated lines, and two inter-variceal nodes. Chocolate 

 color ; usually same tint within the aperture the outer lip of 

 which is denticulate. Length, 2'5 inches. 



Philippines ? Valparaiso, Porto Rico. 



The two latter localities are authentic, the first is that given in 

 the books, and is doubtful. It should bo found on the \\Vst 



