JNTRODUCTION. Panama Shells. 7 



limits, out of which they never have been found. With most 

 of the littoral species, these limits are extremely narrow. 

 The following is a list of the species which we collected at 

 Panama and Taboga, which occur also at the Grallapagos, 

 with a statement of their habits of station. 



Cyprasa rubescens ; under stones. 



Mitra tristis ; at the depth of 6 to 10 fathoms of sandy 

 mud ; also under stones, near low water mark. 



Planaxis planicostata ; under stones, between high water 

 and half tide level. 



Purpura Carolensis ; under stones, at low water mark. 



Columbella atramentaria ; under stones, at low water 

 mark. 



Columbella bicanalifera ; sandy mud, in 10 fathoms 

 water. 



Columbella hcemastoma ; under stones. 



Columbella nigricans ; under stones, between half tide 

 and low water mark. 



Ricinula Reeviana ; under stones, near low water mark. 



Cassis coarctata ; in crevices of rocks. 



Oniscia tuberculosa ; in clefts of rocks, at low water 

 mark. 



Conus brunneus ; in clefts of rocks, at low water mark. 

 Conus nux ; station unknown. 



Strombus granulatus; sandy mud, at the depth of 6 to 8 

 fathoms. 



Turbinella cerata ; under stones and in the crevices of 

 rocks, at low water mark. 



Pleurotoma excentrica ; coral sand, at the depth of 6 

 fathoms. 



Hipponyx radiata ; attached to stones, near low water 

 mark. 



Fissurella macrotrema ; under stones, on the shore. 



