160 PURPURA. 



P. HAUSTRUM, Montf. PI. 43, fig. 25. 



Exteriorly various shades of chocolate ; within the aperture 

 bluish white, more or less tinged with chocolate. Substance of 

 shell thin. Length, 2-3'5 inches. 



Australia; New Zealand. 



P. PERSICA, Linn. PI. 43, figs. 24, 23. 



Brown, with narrow revolving zones of white alternating with 

 dark chocolate ; aperture bluish or pinkish, with interrupted 

 narrow revolving brown linos upon the interior of the outer lip. 



Length, 3-4 inches. 



Philippines. 



P. inerma, Reeve (fig. 23), does not differ, and /'. lindolplrii, 

 Cheran., is so close that its identity may be suspected. 



P. RUDOLPHII, Chemn. PL 44, fig. 26. 



Shell heavier than P. persica, with usually higher spire ; two 

 or three of the revolving zones develop tubercles ; whorls some- 

 what shouldered ; outer lip less dilated and thicker than in 

 1\ /tersica; columella straighter and less patulous. 



Length, 2-3 inches. 



Philippine*. 

 P. CHOCOLATUM, Duclos. PL 44, figs. 27-29. 



The substance of the shell is uniformly thin ; color uniform 

 chocolate, the columella tinged with orange, the interior bluish 

 or yellowish. In some young specimens the whorls are rounded, 

 without angles or tubercles, whilst others, of same size, have Hie 

 shoulder and tubercles equally developed with the adult. 



Length, 3*5 inch. 



Peru. 



D'Orbigny found clusters of eggs (fig. 28) in May. He says 

 that the mollusk is ver} r active in its movements, and th:it, 

 judging from the quantity of shells found in the vicinity of the 

 ancient tombs at Arica, it must have been a favorite article of 

 diet with the aborigines. 



P. LEFEVREI, Lesson. 



Said to belong to the Patula-group. Has not been figured or 



identified. 



Pacific 0. 





