CATALOGUE OF THE SHELLS OE FLORIDA — CALKINS. 239 



Genus, SIGARETUS, Lam. 



87. S. PERSPECTivus, Say. Found on both coasts at low tide ; gen- 

 erally buried slightly in the sand, in which it leaves a track as it moves 

 along. The animal entirely envelopes the shell, and when caught re- 

 sembles more a huge piece of fat than anything else. 



88. S. MACULATUS, Say. I have never been able to find this species, 

 and doubt its present existence. Probably an aberrant form. 



Family, Pyramidellid^. 

 Genus, ODOSTOMIA. Fleming. 



89. O. I3IPRESSA, Say. Abundant on both coasts. 



90. ODOSTOMIA ALBA, n. s. Plate viii, fig. 3. 



wShell small, white, shining, pellucid, tapering rapidly to an acute apex ; 

 whorls twelve to thirteen; smooth, flat; sutures slightly impressed; 

 outer lips simple, thin ; aperture angular above ; length 7+ mill., breadth 

 2i mill. Dredged by me at Cedar Keys, Pla., in two and six fathoms. 

 My collection. Cabinet of Davenport Academy of Sciences. 



Genus, EULIMA, Eisso. 



91. E. Jamaicensis, C. B. Ad. I found this species at Cedar Keys, 

 bringing them up in the dredge. Mr. Tryon identified the species. 



Family, Cerithiad^e. 

 Genus, CERITHIUM, Brug. 



92. C. versicolor, Adams. 



93. C. MUSCARU3I, Say. 



94. C. SEPTEMSTRIATUM, Say. 



95. C. FERRUGiNEUM, Say. 



96. C. EBURNEUM, Brug. 



97. C. LITTERATUM, Lam. 



98. C. NIGRESCENS, Menkc. 



99. C. NIGRESCENS, var. MINOR, Calkms, 



100. C. SCABRU3I, L. 



The foregoing species were found mostly among the Keys. No. 99 I 

 obtained at Tortugas Keys on the edge of a coral reef, where I collected 

 several hundred specimens. There were none of the large variety among 

 them ; neither did I see any at that point. They present so much uni- 

 formity in size and markings, that while resembling generally No. 

 98, yet are so much smaller that I consider them good as a variety, and 

 propose the name C nigrescens, Menke, variety minor, as sufficiently 

 distinctive. 



Family, Turritellid^. 

 Genus, VERMETUS, Ada^ison. 



101. Y. RADicuLA, Stm. This curious worm like shell Is abundant on 

 both coasts. 



