PIRENA.— Plate I. 



The pagoda Pieena. Shell subulately turreted, shin- 

 ing-black, obscurely obliquely yellow-streaked, whorls 

 fourteen to fifteen, slopingly convex, abruptly angled, 

 faintly obliquely striated ; aperture moderate, colu- 

 mellar margin callously incurved. 



Hah. ? 



Further researches will alone show whether the angula- 

 tion of the lower part of the whorls of this species be a 

 permanent specific character. 



Species 5. (Mus. Cuming.) 



Pirena atea. Pir. testa, acute elongato-tereti, intense 

 atrd, obscure minute luteo-lentiginosd, anfractibus vi- 

 gii/ti aut pluribus, concavo-planatis, dense oblique mi- 

 nutissime striatis ; aperturd parvd, margine columel- 

 lari calloso-incurvo. 



The black Pieena. Shell sharply elongately tapering, 



intense black, obscurely minutely yellow-mottled, 



whorls twenty or more, concavely flattened, densely 



minutely wrinkle-striated ; aperture small, columellar 



margin callously incurved. 

 Strombus ater, Linnaeus, Syst. Nat. p. 1213. 



Nerita atra, Miiller. 



Strombus atro-purpureus, Schrdter. 



Strombus dealbatus, Gmelin. 



Buccinum acicula, Gmelin. 



Cerithium atrum, Bruguiere. 



Cerithium Jiuviatile, Perussac. 



Pirena terebralis, Lamarck. 



Melanopsis atra, Sowerby. 

 Hab. Philippines and Moluccas. 



In this form of Pirena, which we take to be the origi- 

 nal type of the genus, the shell, composed of a greater 

 number of whorls, is more elongately tapering than its 

 congeners, and the sutures are less defined. 



