TROCHIA. 169 



Blainvillei, Desh. PI. f)0, lios. 104, 95, 92. 



Usualh' uniform cliocolate 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. Delessertiana, d'Orb. (fig. 

 95), P. Peruviana. Sonleyet (tig. 92), and P. Janelli^ Kiener, 

 (fig. 98). 



P. LiNEATA, Lam. PI. f)!), lig. lOC. 



Yellowish, witli orange-colored revolving ribs, which are 

 slightly nodulous on the slioulder ; interior yellow, with columella 

 and lip tinged with orange; snlistaiice of shell ratlier thin. 



Length, 1-5 inches. 



H((hital unknown. 



I have not seen this species ; it may be an extieme variety ol 

 P. haemastoma. or possibly the youno- of P. (Jonxiil. 



P. CRUENTATA, Gmcl. PI. .")(), lig. lOf). 



A thin spirally ril)bed shell ; ashy gray with cliestnut l»lolches, 

 orange-colored witliin. Length, TS inches. 



Habitat unknown. 



M3' figure is from Kiister. who alone has attempted to identify 

 it : evidently belongs to the hffinaxioma gi'oup. 



P. FASCiATA, Dunker. 



The description indicates a shell of the ha^mastomoid group, 

 and applies very well to forms of P. In^mastoma. LTnfoi-tunately 

 the specimen is not figured. Locality unknown. 



Subiriniis Trochia, Swaini^. 

 P. CINGULATA, Lluu. 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 sei-ies including 



