279 



Costa Rico Miocenk — Olsson 



struction of the Panana Canal, and former Chief Geologist of 

 the geological force of the Sinclair Oil Corporation in Panana and 

 Costa Rica. 



Gatun Stage: Hill No. 2, Banana River, 



Genus LATIRUS Montfort 

 Latirus infundibulum Gmelin, variety Plate 8, figure 10 



Latirus infundibulum GmeUn, Lamarck, Anim. sans. Vert. (ed,Desh. ) 

 vol. 9, p. 386. 



Latirus infundibulum Guppy, 1866, Quart. Journ. Geol. Soc. Ivoudon, 

 vol. 22, p. 288. 



Latirus infundibulum Gabb, 1873, Trans. Amer, Phil, Soc, vol. 15, 

 p. 217. 



Latirus infundibulum Gabb, 1881, Journ. Acad. Nat. Sci. Phila., vol. 



8, 2nd series, p. 354. 

 Latirus infundibulum Maury, 1917, Bull. Amer. Pal., vol. 5, p. 246, 



pi. 13, fig. 3 



A common recent species of the West Indian and Costa Rican 

 coasts. Only an imperfent specimen was collected from the Gatun 

 beds of lower Pumbri Creek, a small tributary of the Estrella 

 River. From recent examples of ijifimdibuluni , it differs by its 

 shorter canal, more numerous ribs (9 instead 6 or 7), and heavier 

 spiral sculpture. The specimen is, however, to fragmentary to 

 serve as a type for a new variety or related species. 



Gatun Stage; Coll, 7, Pumbri Creek, C. R. 



Latirus irazu, n. sp. Plate 8, figure 12 



Shell subfusiform; solid, with a long spire and shorter can- 

 al; whorls about 9, with heavy, sharp, knob-like ribs and finer 

 spiral threads; the last whorl shows 7, sharp, pointed ribs, which 

 are continuous from suture to suture, but only feebly across the 

 base of the last whorl; the suture is bordered anteriorly by a 

 prominent, frilled band or cord, formed by the elevated edges 



