7° DAVENPOR1 ACADEMY OF NATURAL SCIENCES. 



Perna obliqua Lam. Key West ; abundant in crevices of rocks, be- 

 tween tides; Loggerhead Key. A very curious variety was found at 

 the Tortugas and Key West, with attenuated valves, striped and varie- 

 gated with ash and brown, quite different from the small black form 

 found in crevices of rocks. 



Pinna seminuda Lam. West coast. Sometimes thrown up on the 

 outer beaches of the West coast by thousands, during a storm. Less 

 common than the next. 



Pinna muricata L. West coast, with P. seminuda, and in sheltered 

 bays. On the inside of the outer Keys, I have often found it moored 

 powerfully in a vertical position to a valve of Venus mortoni, and nearly 

 buried in the sand and mud. In this position, the ends of its sharp 

 ragged valves are dangerous to the barefooted shell collector. 



Pinna carnea Gm. Florida Keys; rare. A few living specimens 

 were taken at Tortugas, moored in the same manner as P. muricata, 

 and one or two at the Marquesas Keys. 



Spotidylus croceus Chem. West coast; occasional valves. I have 

 a splendid pair from the South-East Keys, from Capt. William Bahrt. 



Spondylus spathuliferus Sby. West coast ; odd valves. Several 

 living shells were taken from piling at the Tortugas. 



Plicatula ramosa Lam. West coast. Occasionally washed ashore 

 in great numbers. Very variable. 



Lima scabra Born. Tortugas; Bird Key, on corals, at low water. 

 The animal is a brilliant orange scarlet. 



Lima squamosa Lam. Bird Key; Tortugas. Animal purplish crim- 

 son. 



Lima tenera Chem. One living specimen was found at Tortugas. 

 with the other two species, and one was dredged in Tampa Bay. Ani- 

 mal scarlet. These are all beautiful objects when taken alive, the bril- 

 liant mantle showing with fine effect as the animal opens and closes its 

 shell. 



Pecten fuscopurpureus Con. Shell variable in form and color, rang- 

 ing from scarlet to dark purple. West coast. 



Pecten antillarum Reel. Tortugas; Key West. 



Pecten imbricatus Gm. On corals, Bird Key; Tortugas, at low 

 water, with the next species. 



Pecten ornatus Lam. Key West; Garden and Bird Keys, Tortugas. 



Pecten ornatus, var. A large purplish variety was found in the fort 

 at Key West. 



Pecten hemicyclica Rav. Odd valves were rarely picked up on the 

 West coast. I have a pair from the South-east coast, given me by 

 William Bahrt. 



Pecten exasperatus Sby. Young living shells were dredged in Tampa 

 Bay, also off Horse and Chaise. 



