190 Marine Shells of the Western Coast of Florida 



stubby, marked by incremental lines and weak spiral threads. Aperture 

 elongate-ovate, decidedly channeled anteriorly, with the posterior sinus 

 shallow immediately below the summit. Outer lip somewhat thickened 

 behind the edge, sharp at the edge, slightly protracted anteriorly at the 

 notch and marked like the spire; the inner lip is appressed to the colum- 

 ella as a callus extending up on the parietal wall.^sa 



Family CANCELLARIIDAE 



This is a small family most of whose species are native to warm 

 seas and moderate depths. 



The shells are medium-sized, oval, with short spire, and plicate 

 columella. No operculum. 



Genus CAJfCELLARIA Lamarck, 1799 

 ("ancellaria retJculataS" (Linne) PI. 39, fig. 275 



Alt., to 50 mm.; shell ovate, yellowish white irregularly banded 

 and plaited with rusty-brown; thin epidermis; six whorls; spire short, 

 apex acute, body whorl rounded, narrowed below; sutures distinct; 

 strong reticulate sculpture of low, rounded, somewhat oblique longi- 

 tudinal ribs and flattened, revolving bands; intersections more or 

 less nodular; aperture lunate; a recurved notch or short canal at 

 base; outer lip simple, sharply crenate within; columella with three 

 folds revolving deeply into aperture, lower two oblique, upper nearly 

 horizontal; columellar callus extended over body whorl; narrow um- 

 bilical groove at edge of callus. 



Dredged in three to six fathoms. Common beach shell. Occa- 

 sionally albino specimens. 



Cancellaria conradiana Ball PI. 39, fig. 276 



Alt., 25-30 mm. Shell more slenderly ovate with relatively 

 higher spire than C. reticulata; white with scattered maculations 

 of light brown; apex acute, nuclear whorls yellowish, glossy; spire 

 terraced; reticulate sculpture clear and sharp; columella has three 

 plications. One revolving band forms a sharp lamellar ridge above 

 columella. Other characters typical. 



Dredged in five to seven fathoms. 



352Bartsch and Rehder: Proc. U.S. National Museum, vol. 87, No. 3070. 

 3''3 Lat., cancellarc, to make like a lattice; reticulatus, reticulate. 



