42 STUDIES IN GEOLOGY, No. 3 



of the shoulder, which is subacute and rounded just below 

 the keel. The surface is straight below. The aperture is 

 long and narrow. Height, 75 ; diameter, 48 mm. 



A number of individuals of this variety occur in both the 

 Hopkins and Nelson collections. It differs from C. molis 

 Brown and Pilsbry, 33 from Gatun, in being somewhat 

 smaller, lacking the fine spiral striae, having the whorls of 

 the spire less concave, and in being convex for a shorter 

 distance below the shoulder of the body whorl. Conus ca- 

 cuminatus, of the local fauna, differs in having a straighter 

 profile and a much more conic spire. 



Upper Zorritos. Quebrada Tusillal, and del Toro. 



Family CANCELLARIIDAE 



Genus CANCELLARIA Lamarck 



Subgenus Aphera H. & A. Adams 



Cancellaria (Aphera) peruana Nelson 



PLATE IV Fig. 13. 



Aphera peruana Nelson, Trans. Conn. Acad., vol. 2, p. 190, pi. 6, 

 fig. 3, 1870. 



"Shell elongated, sub- fusiform ; spire short, pointed, 

 formed by five or six moderately convex whorls. Body 

 whorl large, three-fourths the length of the shell, ventricose. 

 Surface marked by nearly equal longitudinal and transverse 

 ridges, which form strong raised cancellations, and are so 

 arranged as to form blunt, obtuse granulations at the point 

 of contact. Longitudinal lines finer, and much crowded 

 near the outer lip. Aperture oblong-oval, t narrow, half as 

 long as the shell. Lips covered with callus, which is con- 

 tinuous above and below the aperture. Callus of columella 

 lip strongly reflexed over the shell, much broader above 

 than below, almost completely covering the umbilicus. Outer 



Proc. Ac. Nat. Sc. Phila., vol. 63, p. 343, pi. 23, fig. I, 1917. 



