BORSONIA. 227 



Genus BORSONIA, Bellardi, 1846. 



In the fossil Borsonia prima, the shell is fusiform, the lip not 

 varicose, the columella with a single plait, high up ; but in some 

 fossil species there are indifferently one or two plaits, so that 

 Cordiera (= Scobinella) is generally considered synonymous. 

 The following recent species, referred to Borsonia, are now 

 placed here with some hesitation ; the plications being usually 

 more numerous, and the shells otherwise resembling that section 

 of Mangilia for which the name Glyphostoma has been proposed. 

 Unfortunately, the operculum of none of the species has been 

 noticed ; and I really doubt its existence in any of them. My 

 conviction is that these forms will all be found to be Glypho- 

 stomse, and that the diagnosis of that group will need to be' 

 enlarged to include species having several as well as many 

 columellar plications. 



B. CRASSI COST ATA, Pease. PL 34, fig. 94. 



Shell fusiform, shining, longitudinally coarsely ribbed, crossed 

 by revolving raised striae ; whorls rounded, with well-impressed 

 sutures ; aperture narrow ; outer lip denticulated within ; canal 

 short, slightly recurved, light yellow or pink. Length, 7 mill. 



Sandwich Islands, Paumotus. 

 B. BIFASCIATA, Pease. 



Shell fusiform, shining, longitudinally coarsely ribbed ; crossed 

 by coarse raised stride ; whorls rounded at the sutures ; outer 

 lip thick, incurved, serrated on the edges at the termination of 

 the transverse striae ; canal short and slightly recurved ; color 

 white ; two light brown bands on each whorl. 



Sandwich Islands. 



Not figured, and I have no specimens ; the description may 

 be compared with B. nigrocincta, Montr. 



B. LUTEA, Pease. 



Shell fusiform, solid, shining; whorls convex, angulated at 

 the sutures, longitudinally regularly and closely ribbed, crossed 

 by regular transverse ridges ; aperture narrow ; outer lip thick, 

 denticulated within ; canal produced and recurved ; light 

 yellowish brown. 



Sandwich Islands. 



Unfigured. 



