Bui^LETiN 39 256 



Canceliaria Rowelli Dall Plate 6, figure 7 



Cancellaria Rowelli Dall, 1898, Proc. Acad. Nat. Sci. Phila., vol. 19, 

 p. 307, pi. 29, fig. I. 



Cancellaria Rowelli Maur}^ 1917, Bull. Amer. Pal., vol. 5, p. 227, pi. 

 16, fig. 2 



Two specimens of a Cancellaria which seem to be this spec- 

 ies, were collected from the Gatun beds of East Grape Point 

 Creek. The axial ribs are numerous, oblique and somewhat ir- 

 regular. The spaces between the ribs are finely spiralled with 

 deep, incised lines, producing narrow and regular spiral bands. 

 The columellar plications are large and more or less bifid. Shell 

 measures: 



Length 30, diameter 18, last whorl 21 mm. 



The Cornell Museum contains, in the Gabb collection, a 

 single specimen v/hich is probabl}^ this species. It agrees with 

 the Costa Rican shells. This species was described by Dall from 

 the Miocene of the Rio Amina, Santo Domingo. 



Gatun Stage: Collection 2, East Grape Creek, C. R. 



Subgenus TRSeOWOSTOMA Blainville 



Canceiiaria toroensis, n. sp. Plate 6, figure 4 



Cancellaria {Trigonoslonia') afl. Cancellwria bullata Sowerbj', Toula, 

 191 1, Jahrb. der K-K. Geol. Reichsanstalt, vol. 61, p. 504, pi. 30, 

 fig. 10. 



Shell with 6 large, expanding whorls; the nucleus of 25^ 

 whorls is small, closely coiled and smooth; the succeeding 2 

 post-nuclear whorls are small, convex and finely reticulated with 

 6 spirals and fine ribs; the last two whorls are deep!}" channeled 

 or excavated along the suture; this excavated band is .smooth, 

 except as crossed by oblique growth lines; the last whorl is 

 somewhat contracted above and between this contracted zone and 

 the sutural channel is a large, heavy, more or less bifid spiral 

 cord. This spiral cord is rendered coarseh' and sharpl}^ nodulose 

 by the axial sculpture; the sculpture consists of about 21, narrow, 

 low, oblique riblets crossed by strong spiral cords; the .spirals are 



