SIMPSON CONTRIBUTIONS TO THE MOLLUSCA OF FLORIDA. 47 



cameo, the Doliums, galea and perdix, the Ianthinas, Area incongrua, 

 Pecten ornatus, and many others, are found along the entire eastern 

 coast of the State, and even, in some cases, as far north as the coast of 

 North Carolina, though not one of them, so far as I know, is found on 

 the west coast. The molluscan fauna of the Bermudas, though these 

 islands lie north of the northern limit of Florida, is much more like 

 that of the lower Keys than that of the west coast. 



Another point worthy of notice is that many of the Atlantic coast 

 species appear on the west coast of the State, some of which, though 

 abundant at Tampa Bay and northward, are not found, or are rare, at 

 the southern extremity of the peninsula. Among the Atlantic coast 

 species found on the western shore of the State, I may mention Uro- 

 salpinx cinerea, Eupleura caudata, Columbella avara, Natica dupli- 

 cata, Crepidula glauca, fornicata, and convexa, Bittium nigrum, Litto- 

 rina irrorata, Mactra lateralis, Crassatella lunulata, Macoma proxima, 

 Ostrea virginica, etc. Some of these extend westward to the coast of 

 Texas. I have seen a number of these in the collection of Mr. Harry A. 

 Pilsbry, picked up by him at Galveston, and among them valves of 

 Petricola pholadiformis, a shell which I have never found on the west 

 coast of Florida. It is reported from that locality by Mr. Calkins, but 

 I have seen the shells presented by that gentleman to the Davenport 

 Academy and bearing that label, and they are only worn valves of 

 Plwlas costata. Whether or not these species passed into the Gulf of 

 Mexico before the peninsula attained its present dimensions, as has 

 been surmised, is a question I think we cannot settle until we know 

 more of the distribution of living fon^s and of the fossil species of the 

 State. 



I found the Tortugas wonderfully rich in the smaller forms of the 

 mollusca, and many species were obtained there which I think have 

 never heretofore been credited to Florida. Sarasota Bay and vicinity 

 and Tampa Bay were also very prolific in species. A single dredging 

 trip of some twenty hauls, in the latter body of water, yielded about 

 one hundred and twenty-five species, many of them never obtained 

 elsewhere. 



Second — -The land shells of the State consist of a few species of 

 wide distribution, such as Zonites indentatus, arboreus, minusculus, 

 and fulvus, Strobila labyrinthica, several of the Pupas, Carychium ex- 

 iguum, Succinea obliqua, and the like; a number that are peculiarly 

 southern in their distribution, among which the Polygyras are numer- 

 ous, both as to species and individuals, and a good many species whose 

 metropolis is the West Indies and South America, probably brought 



