SIMPSON — CONTRIBUTIONS TO THE MOLLUSCA OF FLORIDA. 69* 



Mytilus domingensis D'Orb. Among oysters, Tampa and Sarasota 

 Bays. 



Mytilus hantatus Say. Manatee River. Abundant in brackish water, 

 among oysters. 



Mytilus lavalleanus D'Orb. Key West. 



Modiola papyria Con. Rare. Terraciea Bay, washed up on south 

 side of the island; one large, broken shell in Terraciea Cut-off; south 

 side of Manatee River, near Manatee, after a storm; Lost Man's 

 Point. An exceedingly lovely and fragile shell. It is M. patagnce Reeve. 



Modiola sulcata Reeve. West coast, occasionally; salt pond on Ter- 

 raciea Island; coast of Volusia County, Cunningham, large and firm. 



Modiola semicostata Con. West coast; very common among man- 

 groves, at high tide, nearly buried in the earth, and firmly moored by a 

 byssus. 



Modiola tulipa L. West coast; abundant. There seems to be two 

 forms of this shell on the West coast, one large, hirsute, and beautifully 

 painted with yellow, orange, scarlet, and brown, the colors showing 

 through to the interior; the common form received from the West 

 Indies and Bermudas, and a smaller shell shaded with blue and violet, 

 and smoother. 



Lithodomus bisulcatus D'Orb. Found living in blocks of Vermetus, 

 on Long Key. 



Lithodomus forficatus Raw Found burrowing in living shells of 

 Chama macrophylla, and in coral, Tortugas. 

 Lithodomus niger D'Orb. In coral, Tortugas. 

 Botula semen Reeve. In coral, Tortugas; Little Content Key. 

 Modiola ria cinnamomea Brug. Tortugas ; scattered valves. 



Modiolaria lateralis Say. Floating in Magill's and Tampa Bays, im- 

 bedded in Algol. 



Modiolaria lignea Reeve. A few shells of this fine species were found 

 washed up on Shaw's Point, at the mouth of the Manatee River, and 

 one specimen was taken alive on a sand-bar in Tampa Bay, near by; 

 Tortugas, one shell. Not hitherto reported from the west coast of 

 Florida. 



Dreissensia leucophaata Con. Ware's Creek, Manatee County, be- 

 tween brackish and fresh water, attached to crevices of stones. 



Avicula atlantica Lam. West coast. Often attached to floating 

 Algce. 



Avicula radiata Leach. Tortugas; Florida Keys; West coast; 



abundant on Sanibel Island. Very variable. 



Avicula ala-perdicis Reeve. Tortugas, on piling; very large and 

 fine. It may be a form of the preceding. 



Pertia ephippium L. Tortugas; one large valve. It is common at 

 the Bahamas and Bermudas. 



