GERITHIUM. Panama Shells. 157 



regular and prominent on tbo last -wliorl, on the periphery of 

 which they become obsolete ; anteriorly with spiral raised lines, 

 of which one near the periphery is larger : apex acute : spire 

 with the outlines moderately curvilinear: whorls fifteen, con- 

 vex, with a well impressed suture : aperture large, quadrate- 

 crbicidar, broadly effuse above, with a narrow sinus in place of 

 the canal : labrum and labium thick, not continuous ; labium 

 reflected below. 



It resembles Orbigny's figure (not Kiener's) of 0. Montagnei; 

 Orbigny's description is too meagre to enable us to identify our 

 species with it, and the figure represents it with flattened 

 approximate ribs, and with several spiral white bands, most 

 of which are wanting on our shell. 



Mean divergence about 28° ; length 1.55 inch ; breadth .66 

 inch ; length of spire 1.04 inch. 



Station. — ^With G. pulchrum, q. v. 



HaUtat. — Panama ; C. B. A. ! 



190 specimens were collected with C. pulchrum. 



206. Ceritliitim Talidtiin. Nov. sp. 



Shell long, conic : dark reddish brown, with a pale spiral line 

 along the middle of the whorls : rufous on the varices, and white 

 in the aperture: sometimes whitish on the varices, the spiral 

 ridges, and the last whorl : with, on each whorl, about twenty 

 arcuate ridges, which are prominent and rather narrow but not 

 compressed, and which terminate abruptly at the periphery of 

 the last whorl : with stout varices about 270° distant : with six 

 spiral ridges, of which two next below the suture are small and 

 approximate, and are sometimes replaced by a single ridge : 

 and of which one is partly concealed in the suture : with inter- 

 mediate minute spiral strife : anteriorly covered with slightly 

 wrinkled spiral ridges : apex acute : spire with the outlines mode- 

 rately curvilinear : whorls twelve, convex, with a deep suture : 

 last whorl subangular at the periphery, very short : aperture 



JULY, 1852. 40 Aim. Lto. Nat. Hist. 



