223 



Costa Rico Miocknk — Olsson 



51 



related to the recent Conus Sthnpsoni Dall from the Florida 

 Straits. (Proc. U. S. Nat. Mus., vol. 24, p. 503, pi. 29, fig. 7, 

 1903). 



Surface of whorls are heavily sculptured with 25, 30 or 

 more subequal spiral cords. Upper surface of whorls, flat or 

 slightly concave and with 3 or more spirals. The shoulder is 

 sharp and bounds a rather high, conic spire. 

 Length 31, breadth 16 mm. 



Gatun Stage: Port Limo7i. 



Conus planiliratus, var. bocasensss, n. var, Plate 3, fig. 14, 16 



Shell of medium size, solid with a broad, stubb}' outline; 

 spire low, conic with nearly straight sides and composed of seven 

 or more w^horls; the ist 4 or 5 post-nuclear whorls are coronated; 

 spire-whorls with 3 faint spirals and curved growth-lines; body- 

 whorl large and wide, with 25 strong but somewhat irregular 

 simple spiral cords; their interspaces are wide and with crowded, 

 raised lines of growth and sometimes intercalated spirals; anter- 

 ior canal nearl}^ straight. 



Length 32, breadth 17 mm. 



This Cone, which should probably be considered as distinct, 

 is fairly common in the shale beds, belonging to the Gatun 

 Stage on Eocas Island. From typical planiliratiisiX. differs in its 

 broad stubby form and coarse sculpturing. 



Gatun Stage: Bocas del Toro, Panama. 



Conus marginatus Sowerby Plate i, fig. 20 



Conus uiarginatus Sowerby, 1849, Quart. Jour. Geol. Soc. London, 

 vol. 6, p. 44. 



Canus marginatus Gabb, 1873, Trans. Amer. Phil. Soc. , vol. 16, p. 

 230. 



Conus marginatus Guppy, 1876, Quart. Jour. Geol. Soc. London, vol. 

 32, p. 528, pi. 29, fig. 5. 



Conus marginatus Maury, 1917, Bull. Amer, Pal., vol. 5, p. 210, pi. 7, 

 fig. II. 



