70 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



Planorbis tumulus Pfr. Ponds south of Manatee River; sluggish 

 stream in Cedar Hammock. A Cuban species also found in Mexico. 



Planorbis Durxi Wetherby. Volusia County, Cunningham; Orange 

 County, Pilsbry ; Royal Palm Hammock, associated with Ampullaria 

 caliginosa and Cyrenoida floridana, on a low wet prairie. 



Planorbis exacutus, Say. Pine Level, Florida, in a swampy stream; 

 young. 



* Planorbis glabratus Say. Mayport. Several beautiful shells were 

 received from Mr. F. C. Sawyer. 



Ancylus filosus Con. Ponds near Fogartyville. 

 *Ancylus obscurus Hald. Ferguson's Pass, Hemphill. 

 Siphonaria alternata Say. Key West. 



Siphonaria alternata, var. brunnea Hanley. Key West; abundant 

 on rocks at high tide. 



* Siphonaria lineolata D'Orb. St. Augustine, Hemphill; East coast, 

 Cunningham. 



Dentalium disparile D'Orb. Dredged in seven or eight fathoms, in 

 Tampa Bay. 



Dentalium lubricum Dall. Tortugas. 



Dentalium antillarum D'Orb. Tortugas; dead shells. 



Dentalium coarctatum Lam. Tampa Bay. 



Rocellaria oi'ala Sby. Two specimens were found burrowing in 

 coral on Sand Key, Tortugas. One living example was dredged in 

 Tampa Bay. Another was found burrowing in the shell of Area Nooz, 

 in Little Sarasota Pass. 



Roeellaria rostrata Speng. ? A living shell was accidentally broken 

 on being taken from its burrow in the rocks on Little Content Key, 

 which agrees quite well with the figure of this species. 



Teredo norvegica Speng. Taken from timber in the Manatee River. 



Xylotrya bipinnata Jeffr. Burrowing in lumber of the Floating Dry 

 Dock, Manatee River. 



PJwlas costata L. Although this is a West Indian shell (it extends 

 as far south as Patagonia), it seems to attain its greatest size and beauty 

 at Cedar Keys, so far as I have examined specimens from the Florida 

 coast. A shell from that locality in my collection is about eight inches 

 in length, and very beautiful. Those in the vicinity of Tampa Bay are 

 smaller, while at Cape Sable, where odd valves are washed up by the 

 thousand, I did not find one over five inches in length. 



Pholas truncata Say. West coast, occasional valves; and quite 

 abundant at Cape Sable. 



Martesia cuneiformis Say. A large number of shells were found by 

 Mr. R. C. Stuart, on the West coast, in a floating palmetto log. I 

 found shells at Long Key and Tortugas. Cedar Keys, Hemphill. 



Martesia smithii Tryon. A fine shell was dug out of an old vessel 

 in the Manatee River. 



