82 Bui^LETiN 39 254 



raised cords, separated by wide, deep interspaces; there are 4 

 spirals on the spire- whorls, with 15 on the last whorl and the 

 canal; base of last whorl rounded and contracted to the short, 

 beak-like anterior canal; columella with 2, narrow, but strong 

 plications, of which the upper is much the strongest; aperture 

 sub-elliptical with the outer lip carr34ng 8, narrow, entering 

 lirse. 



Length 25, diameter 14.5, last whorl 18 mm. 

 This shell should probablj^ be considered as a variety of C. 

 Barretti Guppy, but in the large series in our collection, the shell 

 is always much smaller and with a much coarser and heaver sculp- 

 ture. In some specimens, this sculpture becomes quite sharp 

 and harsh, brought about by the crossing of the narrow spiral 

 cords and equally narrow axial ribs. 



It is an abundant and characteristic species of the Gatun beds 

 along the Banana River, C. R. 



Gatun Stage: Ba^iana River. 



Cancellaria Mauryse, n. sp. Plate 6, figure 5 



Cancellaria Barretti Maury, 1917, Bull. Amer. Pal., vol. 5, p. 226, pi. 

 10, fig. I. Not of Guppy, 1866. 



Shell large, ovate; an evenly conic spire in height less than 

 the length of the aperture and a large, evenly convex last whorl; 

 the nucleus is rather small, of 2 smooth, convex whorls followed 

 by aboitt 6 post- nuclear whorls; the profile of the spire- whorls is 

 slightly convex with deep, distinct suture; the sculpture is can- 

 cellate or reticulate, the spirals and ribs of very nearly equal 

 strength; of the axial ribs there are 40 or more on the whorl, 

 crossed b}' 24 spiral cords; on the spire-whorls there are 5 spiral 

 cords becoming .7 on the penultimate; the spirals are fairly regu- 

 lar, separated by interspaces 1 5^ times their width, in which 

 smaller spirals ma}'- occasionally appear; faint indications of rest- 

 ing marks show as crowding of the ribs or as smooth, slightly 

 humped spaces; aperture large, ovate; a thin outer lip with 17, 

 long entering lirse; columella with 2 simple plicse, of which the 



