34 Panama Shells. cyprJeidjj- 



more important difference is in its form, which is scarcely dis- 

 tinguishable from that of C. exanthema. Although there is a 

 prevailing type of coloring in each of these three species, it is 

 rather less constant than the form, so that G. cervinetta is some,- 

 times liable to be confounded with C. exanthema, until we ob- 

 serve the aperture, which is like that of G. cervina. The latter 

 is ventricose, rather thinner, with the aperture dilated anteri- 

 . orly ; G. cervinetta is subcylindric, with the aperture as in G. 

 cervina ; G. exanthema is subcylindric, with the aperture nar- 

 row anteriorly, and the right lip more bent upwards anteriorly. 



Station. — At and just above the low water mark of the 

 spring tides, this species was found under stones which were 

 not less than fifteen or twenty inches in diameter. 



Habitat. — Caribbean Sea, and shores of Senegal : Kiener. 

 Indian Ocean ? Deshayes. 

 Indian Ocean ; Jay. 

 Panama, and I. of Taboga : C. B, A ! 



The words of Kiener are " Habite I'ocean des Antilles et 

 les c6tes du Senegal." Since no authority is given for this ha- 

 bitat, and since gross errors o^habitat are common in Kiener's 

 Iconography, we must be allowed to regard the statement as 

 wholly erroneous. Some varieties of G. exanthema, which is 

 a Caribbean species, might be mistaken for G. cervinetta, and 

 thus lead to the belief that the latter is also Caribbean. But 

 C. exanthema is exclusively Caribbean ; G. cervinetta we 

 believe occurs only in the Panama province, as we have above 

 defined this province ; and G. cervus probably belongs to the 

 Polynesian zoological province. We have indeed received a 

 specimen of G. cervinetta from the Sandwich Islands ; but at 

 these islands it is a common custom to collect shells from the 

 whale ships. The habitat assigned to the species by Des- 

 hayes (copied by Dr. Jay ?) is probably due to hearsay testmony. 



Probably the " G. exanthema" found by Mr. Hinds at the 

 island of Muerte belongs to this species. 



