132 Bulletin 39 



A large species, possibly identical with the recent Murex 

 brevifrons Lamarck. The varices are large and cross the spire 

 whorls in a spiral direction. Betv\^een the varices, there is gen- 

 erally a single rib-like elevation in the middle of the whorL 



Gatun Stage: Coll. ^, East Grape Point Creek. 

 Coll. 5, Bed Cliff Creek. 

 Rio Betey. 

 Sousi Creek. 



Genus TYPHiS Montfort 



Typhis aiatus Sowerby Plate lo, figure 15 



Typhis alatus Sovv'erby, 1849, Quart. Journ. Gaol. Soc. London, vol. 6, 

 p. 48, pi, 10, fig. 4. 



Typhis alatus Gabb, 1873, Trans. Amer. Phil. Soc, vol. 15, p. 203. 



Typhis alatus Guppy, 1876, Quart. Journ, Geol. Soc. London, vol. 32, 



p. 522. 

 Typhis alatus Brown and Pilsbry, 191 1, Proc. Acad. Nas. Sci. Phila.,, 



vol. 63, p. 354. 



A very characteristic species distinguished by the large wing- 

 like expansion of its outer lip. It is the largest species in the 

 Gatun and measures about 23 mm in height by 17 mm in diame- 

 ter. It is found also in the Miocene of Santo Domingo and in 

 the Bowden beds of Jamaica. 



Gatun Stage: Gatitn, C. Z. {Brown and Pilsbry) 

 Toro Cays, Panama. 



Typhis linguiiferus Dall, var. costaricesisis, n. var. Plate 10, figs 22, 29 



cf. Typhis lingulijerns Dall, 1890, Trans. Wagner Free Inst. Sci., vol. 

 3, pt. I, p, 152, pi. 12, fig. 7. 



This is a smaller and more delicate species than the T. Gabbi 

 Brown and Pilsbry from the Canal Zone. They agree with the 

 Chipolan linguiiferus Dall in their general form but differ in their 

 uniformly smaller size and in nearly lacking the spine-like pro- 



