Nelson on Tertiary Mollusca of Peru. 191 



Cancellaria triangularis, sp. nov. 



Plate VI, figure 10. 



Shell ovate, ventricose, spire elevated acuminate, composed of five 

 or six whorls. Three upper, are regularly convex, and marked by 

 prominent ribs and lines ; the remaining whorls are very angular, 

 flattened and depressed above. Body whorl large, very triangular, 

 nearly two-thirds the whole length of the shell, strongly depressed. 

 Sutures distinct, but not prominent. 



Ribs strong, ten to twelve on each whorl, and well marked on the 

 top of each whorl. Whorls of spire are marked just below the su- 

 tures by two or three distinct but fine lines, and much depressed in 

 front of them ; and marked laterally by tln-ee strong ridges, the upper 

 one nodulous. Body whorl with the ribs strong above, gradually 

 disappearing below, and with nine to eleven transverse, nearly equal 

 lines, which form, with the ribs, quadrilateral cancellations, averaging 

 4' millim. by 1*8 millim. 



Aperture long and narrow ; outer lip thin. Columellar lij) covered 

 by a thin callus, strongly reflexed over the whorl above, and having 

 within two strong plaits, the upper one much the larger. Um- 

 bilicus small, nearly covered by callus, surmounted by a prominent 

 keel. Ganal short, nearly straight and open. Length 25*4 millim. ; 

 length of spire 7 "6 millim. ; breadth 17 millim. 



Cancellaria spatiosa, sp. nov. 



Shell ovate, ventricose; spire short, elevated, acuminate; sutures 

 distinct, especially the one separating the spire from the body whorl. 

 Whorls seven, convex. Body whorls very convex and ventricose, 

 three-fourths the length of the shell, broadest near the center of the 

 shell and rising into more or less of a shoulder above the aperture. 

 Surface of upper whorls not examined. Remaining surface smooth, 

 except the markings of the lines of growth. 



When the outer surface is removed there is seen a series of strong 

 transverse lines, about five or six in the space of 10 millim. Aper- 

 ture semi-oval, nearly as long as the body whorl ; outer lip sharp, 

 marked "wdthin by rather distant teeth, which extend well into the 

 interior, but gradually thin out. Columellar lip covered by a strong 

 thick callus, which spreads over the convex surface of the whorl, and 

 over the umbilical region, rising within the aperture into three strong 

 plaits, the upper being much larger than either of the others. Canal 

 short, open, slightly reflexed, and surmounted by a prominent keel. 

 Our largest specimen measures: length 65-4 millim.; length of spire 



