8 THE NAUTILUS. 



Physa niagarensis Lea. 



Ancylus parallelus Haldeman. 



Planorbis deflectus Say. 



Planorbis campanulatus Say. 



Galba galbana (Say). 



Galba humilis rustica (Lea). 



Comparisons between the faunas of the two localities would be 

 without significance until more systematic collecting has been done. 

 The list of species will doubtless be greatly extended by future 

 research. 



CONCERNING CYPKAEA EXANTHEMA, CERVUS AND CERVINETTA. 



BY EUGENE W. PRESBREY. 



G. exanthema, Lin., 1767; Gray, 1825; Reeve, 1844; Hinds, 

 1845 ; Adams, 1852 ; Roberts, 1885 ; Dall, 1903. 



(?. cervus, Lin., 1771 ; Lam., (cervina) 1822 ; Gray, 1825 ; Reeve 

 (var. ex.), 1844; Adams, 1852; Roberts, 1885. 



G. cervinetta, Kiener, ; Desh, 1844; Adams, 1852; Roberts, 



1885. Reeves says cervinetta is var. of cervus. Adams speaks of 

 cervina, which was Lamarck's name for cervus, as distinct from 

 cervus. Gray names var. a, and b, of exanthema. Roberts says 

 cervinetta is a var. of exanthema. 



For habitat, Roberts give cervus to Panama and West Coast of 

 America. Dr. Dall properly locates exanthema from Hatteras to 

 Darien, but he does not mention cervus either as a variety or as being 

 found on the Florida east coast. Reeve and Sowerby located cervus 

 in the East Indies. Adams said Polynesian Province. 



The majority of monographers have distinguished cervus from 

 exanthema, but none seems to have found a home for it. Nor are 

 the other two definitely placed. Roberts is nearest to the facts. 



For three years past the writer has had favorable opportunities for 

 the study of these species in there natural habitat and may, perhaps, 

 presume to record some facts that have forced themselves upon him. 



Cypraea exanthema is found from Hatteras to Darien, but in 

 greatest numbers and perfection of development around the Florida 

 keys. They are born in the deep water. When an inch or so in 



