POLYTROPA. 177 



P. BICONICA, Hutton. 



Shell small, widely fusiform ; spire short and pointed ; last 

 whorl wide above and narrowed below, with spiral ribs and slight 

 transverse plicae. Whitish, shaded with dark brown; within, 

 dark purplish brown, with white teeth inside the lip. 



Length '4, diam. '28 inch. 



ffew Zealand. 



Not figured. The name has been already used by Anton. I 

 am not able to identify it. 



P. RETIARIA, Hlltton. 



Shell oval-fusiform ; whorls carinated, with four or five spiral 

 ribs in front of the carinse, and a small one behind it on 

 the last whorl, crossed by transverse plicae at regular intervals, 

 forming a series of squares on the surface. Whole shell covered 

 with delicate transverse foliations. Aperture oval ; columella 

 curved ; canal short and slightly bent. Grayish white ; purplish 



within. Length '9, diam. '5 inch. 



New Zealand. 



P. DUMASI, Yelairi. PI. 54, figs. 162, 167, 170, 172. 

 A polymorphous species ; whitish or pale rosaceous. 



Length. '75-1 -2 inches. 



Isle of 8t Paul, Indian Ocean. 



The type is so close to P. patens, Hombr., that I suspect them 

 to be identical ; in which case the latter name will take prece- 

 dence. Mr. Yelain has selected from the numerous forms of this 

 species the following named varieties : 



Tar. multistriata, fig. 172. 



Yar. semicostata, fig. 170. 



Yar. cincta, fig. 162. 

 P. PATENS, Hombr. et Jacq. PI. 54, fig. 171. 



Light gray, cinereous within. Length, 21 mill. 



Probably = P. Dumasi. New Zealand. 



P. VARIABILIS, Desh. 



Chocolate ; violaceous within ; lips crenulated. 



Length, 1'3 inches. 



Isle of Bourbon. 



Allied to P. patens, Jacq.. evidently. 

 33 



