CERITHIUM. Panama Shells. 155 



Habitat. Panama ; C. B. A. ! 

 33 specimens were collected. 



202. Cerithium Pacificum. 



Synonymy. 



Cerithium Pacificum Sowb. Genera. No. 42. f. 9. 1824. 



Humboldti Valenc. in Huuib. Rec. Obs. II. 280. 1833. 



- Kiener Iconog. p. 83. pi. 26. f. 2. 



- Pacificum Reeve Conch. Syst.pl. 236. f. 9. 1842. 



Kiener ascribes priority to the description by Valenciennes in 

 Humb. Eec. Obs. The second volume of Humboldt's work, in 

 which the Mollusca are described, bears the date 1833. 



Station. Unknown. 



Habitat. Cumana ; Humboldt & Bonpland ! Valenciennes. 

 Cumana ; Kiener. 

 Panama ; Jay. 

 Panama ; C. B. A. ! 



1 specimen only was found. 



203. Cerithium pauperculum. Nov. sp. 



Shell slender : pale horn color : with several spiral keels, of 

 which five are visible on the spire, with many transverse ridges 

 on the upper whorls, which are reduced to raised lines on the 

 lower whorls, with the intersections slightly granulous ; ante- 

 riorly the spiral ridges are obsolete : apex acute : spire with 

 the outlines nearly rectilinear : whorls eight, slightly convex, 

 with a moderately impressed suture ; last whorl rather long : 

 aperture long, acute above, with a small umbilical chink : canal 

 very short. 



Mean divergence about 18 ; length .13 inch ; breadth .04 

 inch ; length of spire .09 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 



2 specimens were found. 



