TROOHTA. 169 



'BlainwHei, Desh. PL 50, figs. 104, 95, 92. 



Usually uniform chocolate color exteriorly ; the aperture bor- 

 dered with chocolate, bluish within. Shoulder and tubercles 

 very slight, shell rather thin. Peruvian. To this form belong 

 P. Callaoensis. Blainv. (non Gray), P. Del esser liana, d'Orb. (fig. 

 95), P. Peruriana, Souleyet (fig. 92), and P. JanelH, Kiener. 

 (fig. 98). 



P. LINEATA, Lam. PI. 50, fig. 10(>. 



Yellowish, with orange-colored revolving ribs, which are 

 slightly nodulous on the shoulder ; interior yellow, with columelln 

 and lip tinged with orange ; substance of shell rather thin. 



Length, 1'5 inches. 



Habitat unknown. 



I have not seen this species ; it may be an extreme variety of 

 P. h&mastoma, or possibly the young of P. Consul. 



P. CRUENTATA, (Imel. PI. 50, fig. 105. 



A thin spirally ribbed shell ; ashy gray with chestnut blotches. 



orange-colored within. Length, 1*8 inches. 



llhitt unknown. 



My figure is from K lister, who alone has attempted to identify 

 it; evidently belongs to the hfrHtnxlinnn group. 



P. FASCIATA, Punkt-r. 



The description indicates a shell of the haemastomoid group, 

 and applies very well to forms of /'. bsemastoma. Unfortunately 

 the specimen is not figured. Locality unknown. 



Suhgnus Trochia, Swains. 



P. CINGULATA, Linn. PI. 51, figs. 108, 110, 111, 114-117. 



The prominent revolving ribs, excavated at their sides, distin- 

 guish this species from all that precede it. Color white or gray ; 

 tops of ribs and interior of aperture usually brown. 



Length, 1*5 inches. 



Cape of Good Hope. 



Reeve has proposed to restrict this species to those having 

 only three revolving ribs, and he describes a form with five ribs 

 as P. spiralis (fig. 114) ; but I have before me a series including 

 22 



