317 Costa Rica Miockne— Olsson 45 



interest and co-operation in obtaining the extensive collections 

 which form the basis of the present work. 

 Gatun Stage: Water Caj', Panama. 

 Gatu7i, C. Z. 



Conus floridanus, var. costaricensis, n. var. Plate 3, figures 3, 9 



Shell conic, with a moderately high spire of about eleven 

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

 projecting apex seen in well-preserved specimens; shoulder angle 

 rather sharp with the whorls slightly concave above between the 

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

 spirals and strongh^ arcuated growth lines; the last whorl below 

 the shoulder angle is usually nearly 'smooth above (sometimes 

 with faint spirals) but with heavy regular spiral groovings to 

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

 idly attenuated and usually somev\'hat flexed below. 



Height 44, breadth 21 inra. 



Type from the Gattm beds of the Banana River. 



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

 classed as a variety of the recent Conns floridayms Gabb, differing 

 only in always being somewhat more slender. They also agree 

 closely with Ball's figure of Conus chipolanns Dall from the 

 Chipola Miocene of Florida. 



Care should be taken in distinguishing this from C. 

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

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

 the canal. 



Gatnn Stage: Ba7iana River: East Grape Point Creek. 

 Comius imitator Brown and Pilsbry Plate 2, figure 6 



Conus imitator Brown and Pilsbry, April, 1911, Proc. Acad. Nat. Sci. 



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

 Conns Dalli Toula, Dec, 1911, Jahrb, der K-K Gaol. Reichsanstalt, 



Wien, vol. 61, p. 508, pi. 31, figs. 23 a-d. 



