r23i Costa Rica Miocene — OlSvSon 49 



12 plus are flat or slightly concave and bordered below by a low 

 carina projectly slightl}^ above the suture; this carina on all ex- 

 cept the last whorl bears low nodes, about 20 to the later whorls; 

 the spire-whorls are otherwise smooth except for the arcuate 

 growth lines; the last whorl is a tapering cone, nearly smooth, 

 except for the faint spirals about its lower one-third; the aper- 

 ture is narrow, straight, with a thin arcuate outer lip. 

 Height 45, diameter 21, aperture 33 mm. 

 This shell belong to the Conns co7i sobriniis group, agreeing 

 in its form and strongly nodulated spire whorls. The main 

 difference is that toroensis is nearly smooth, the spirals showing 

 onl}^ on the low^er one-third, while consobrinus has most of the 

 last whorl covered with beaded spirls. 



Gatun Stage: Toro Cays. 



Conus (Chelyconus) tortuosostriatus Toula Plate i, figure 15 



Conns {Chelyconus) tortuosostriatus Toula, 1911, Jahrb. der K-K. 



Geol. Riechsandstalt, Wien, vol. 61, p. 508, pi. 31, fig. 22. 

 Conus {Hemicomis) toiduosostriatus Cossmann, 1913, Jour, de Conchy- 



liologie, vol, 61, p. 40, pi. 3, figs. 28, 29. 

 Conus tortuosostriatus M^SMry, 1917, Bull. Amer. Pal., vol. 5, p. 205, pi. 



6, fig. 9 



This shell should probabl}^ be considered as a short variety 

 of gracilissivitis Guppy, differing chiefly in its broader form and 

 shorter spire. 



The body-whorl is sculptured with about 24 raised, even, spiral 

 cords, separated by deep, even interspaces. These interspaces 

 are crossed by neat, incised lines, corresponding to the lines of 

 growth. The nucleus consists of about 3, long, tapering smooth 

 whorls, after which follow several turns of carinated and finely 

 coronated post-nuclear whorls. 



Length 22, breadth 9 mm. 



Gatmi Stao-e: Bocas del Toro. 



