317 



Costa Rica Miocene— Oi^sson 



45 



interest and co-operation in obtaining the extensive collections 

 which form the basis of the present work. 

 GaUm Stage: Water Caj', Panama. 

 Gatu?i, C. Z. 



ConuS floridanus, var. COStaricensiS, n. var, I'late 3, figures 3, 9 



Shell conic, with a moderately high spire of about eleven 

 whorls; profile of the spire flat or slightly concave to the long 

 projecting apex seen in well-preserved specimens; shoulder angle 

 rather sharp with the wdiorls slightly concave above between the 

 sutures; spire- whorls generally show 3 or more faint, raised 

 spirals and stronghr arcuated growth lines; the last whorl below 

 the shoulder angle is usually nearly smooth above (sometimes 

 with faint spirals) but wdth heavy regular spiral groovings to 

 the number of about fifteen on the canal; the canal is long, rap- 

 idly attenuated and usually somewhat flexed below. 



Height 44, breadth 21 mm. 



Type from the Gatun beds of the Banana River. 



This fossil, quite common in Costa Rica, should probably be 

 classed as a variet}^ of the recent Coyuis floridamis Gabb, differing 

 only in always being somewhat more slender. They also agree 

 close!}' with Ball's figure of Conns chipoIa7ins Dall from the 

 Chipola Miocene of Florida. 



Care should be taken in distinguishing this from C, 

 imitator of the Canal Zone. In that species, the full-grown shell 

 is larger, with nearly straight sides and finer irregular spirals on 

 the canal. 



Gatiin Stage: Banana River: East Grape Point Creek. 

 Conus imitator Brown and Pilsbry Plate 2, figure 6 



Cofius i'}3!iiator Brown and Pilsbry, April, 11911,, Proc, Acad. Nat. Sci. 



Phila., vol. 63, p. 342, pi. 23, fig. 4. 

 Conus Dalit Toula, Dec, 1911, Jalirb. der K-K GeotL Reicliifsansitait, 



Wien, vol. 6r, p. 508, pi. 31, figs. 23 a-d. 



