SIMPSON — CONTRIBUTIONS TO THE MOLLUSCA OF FLORIDA. 5 7 



growing on Modulus flori Janus. I believe it to be a variety, of C. for- 

 nicata. \ 



Crepidula plana Say. Common on the interior of the Fulgurs and 

 other dead shells. 



Crepidula aculeata Gm. West coast and Keys. Quite variable ; 

 generally found beach worn. 



Cap u •/ 'us intortus Lam. Key West. 



Capulus subrufus Lam. Tortugas. 



Mitrularia equestris L. Tortugas. 



Mitrularia equestris, var. tortilis Reeve. Key West. 



% Xenophora conchyliophora Born. South-east Keys; two living shells 

 were received from William Bahrt. 



Vermctus nigricans Dall. Sarasota Bay and other localities on the 

 west coast, forming solid reefs between tides. In the crevices among 

 these reefs numbers of Mytilus exustus and cubitus, and the various 

 species of Lithodomus find a home. 



Vermetus conicus Dillw. Egmont and Anna Maria Keys. 



Vermctus lumbricalis L., var. spiratus Phil. Common on the west 

 coast. 



Vermetus lumbricalis L., var. bicarinatus Morch. West coast; 

 Cape Sable. 



Vermetus lumbricalis L., var. radical a Stimp. West coast; common. 



Vermetus retifera Morch. Tortugas. A peculiar form, having the 

 tubs flattened and closely coiled, growing on corals and the piling of 

 an old wharf, and having the apertural portion elevated. Mr. Tryon 

 considered it a variety of V. conicus Dillw., but it seems to me quite 

 distinct. 



Vermetus annulatus Daudin. Tortugas. Partly imbedded in shells 

 of Cliavia macrophylla. 



Vermctus annulatus Daudin, var. irregularis D'Orb. Tortugas. On 

 shells and corals, growing in dense clusters. This agrees in color and 

 in being irregularly contorted, and transversely lamellated, with the 

 description of this variety, but differs from it, and from the description 

 of the subgenus in not being imbedded, and in growing in dense clus- 

 ters. It is a Spiroglyphus, as the operculum is convex externally, with 

 concentric laminae, and concave internally, with a central mamilla and 

 narrowly elevated margin. 



Vermetus decussatus Gm. Egmont Key. 



Vermetus nebulosus Dillw.? Tortugas. Attached to shells. On ac- 

 count of the irregular growth of these shells, and the fact that 

 specimens with the opercula are seldom obtained, they are very diffi- 

 cult to accurately identify, and a good deal of confusion exists con- 

 cerning the species. Many of them closely resemble the shells of 

 Serpula, an annelid genus; they differ from the Serpula in having a 

 spiral, nuclear shell, and usually internal lamellee or septa. 



[Proc. D. A. N. 8., Vol. V.] 8 [February 4, 1889.] 



