106 Marine Shells of the Western Coast of Florida 



share the characters of short snout, cylindrical, pointed tentacles 

 with eyes near their outer basal portions, and a large oval foot. The 

 animals are vegetable feeders and move about freely. 



The shells are conical, oval at base, patelliform, either perforate 

 at the apex or having a notch or slit in the anterior margin. The ex- 

 ternal surface is ribbed or cancellated, and the margins may be crenu- 

 lated or smooth. The interior of the shell is smooth, and the apical 

 perforation is usually defined by a circumscribed, elevated callus. 



Their distribution is through all except Arctic seas, and the 

 range in depth is great. 



Genus LUCAPINA Sowerby, 1835 

 Liioapina siiffiisaiso (Reeve) PI. 21, fig. 133 



Alt., 3.5; length, 15; width at middle, 10.5. Shell conical, oblong- 

 oval, depressed, slightly narrower in front; color white or grayish 

 with seven to nine broad rays of darker color; summit anterior to 

 middle, perforation oval, almost the shape of aperture; side-slopes 

 moderately convex; alternately larger and smaller radiating ribs can- 

 cellated by strong concentric ridges; interior bluish white, strong 

 callus about perforation which is truncate behind with a tint of green 

 laterally; margins crenulate. 



Genus LUCArilVELLA Pilsbry, 1890 

 Lucjipinella liinatiilai*i (Reeve) PI. 21, fig. 135 



Alt., 3.5; length, 15; width at middle, 9 mm. Shell small, flat- 

 tened oblong, wider posteriorly; summit almost central, shape of or- 

 ifice corresponds to marginal outline; color an irregular blending 

 of light and dark gray, often with more or less dull rose; radiating 

 ribs alternately large and small in front; laterally and behind, three 

 small riblets alternate with larger ribs which separate wider inter- 

 spaces than those of anterior portion of shell; regular concentric, 

 laminate ridges form semierect, curved scales at rib intersections; 

 interior white, somewhat translucent to external coloration; callus 



^^•^ Lat, lucanus, a beetle; suffusa, to colour. 

 1^1 Lat, dim, of lima, file. 



