38 Studies in Geology, No. 3 



9, slightly concave, the lower edge of each angular, project- 

 ing a little ; the angle tuberculate in the first post-embryonic 

 whorl, smooth in the rest; sculptured with deeply arcuate, 

 narrow, low and widely spaced riblets and striae ; no spiral 

 striae. Last whorl acutely angular at the shoulder, barely 

 convex below the angle, the outline becoming concave in the 

 lower part; sculptured with 20-22 strong, smooth spiral 

 cords, separated by wider intervals which are sharply striated 

 by growth-lines. Aperture very narrow. Length, 24, 

 diam. 13. i mm." — Johnson and Pilsbry, 191 1. 



Lower Zorritos. Quebrada Zapotal, Zorritos district; 

 Santo Domingo ; Bowden, Jamaica ; Gatun, Panama. 



Two specimens in the Hopkins collection are referable to 

 this species. A coating of calcite obscures the finer details 

 of sculpture, and the presence of the longitudinal striations 

 on the body whorl characteristic of gaza are not clear, but 

 other characters agree with sufficient closeness to advise at 

 least tentative reference to the Antillean variety. 



This form occurs at Cercado de Mao, Santo Domingo, 

 in beds ascertained by Maury ^^ to be Burdigalian in age. 

 It occurs also in the Bowden beds of Jamaica, and at Gatun. 

 It is closely related to Conus bocapanensis and Conns berryi, 

 of the Zorritos fauna. A detailed discussion of its relation- 

 ships to them will be found in the remarks on each. 



Conus bocapanensis n. sp. 



Plate I — Fig. 3. 



Conus sp. ind. A, Nelson, Trans. Conn. Acad., vol. 2, p. 194, 

 1870. 



Shell small to medium-sized, unequally biconic, the spire 

 turreted. The spire is fairly high, including about a third 

 of the entire height, its slopes straight in profile. Whorls 

 8-9 in number, the first two of the spire smooth and rounded, 

 the following with a marked keel at the lower third, the 



Bull. Amer. Pal. No. 30, Table at end. 



