MARGINELLIDAE 2 59 



% inch in length, somewhat like our figure 566, but with a higher, more 

 pointed spire. Shell quite thin for a Marginella; color yellowish to whitish 

 and somewhat translucent. Outer lip thickened, pushed in at the middle and 

 white in color. Columella with 4 very distinct folds. Common in shallow 

 water inside dead Pinna shells on mangrove mud flats. 



Hyalina avenacea Deshayes Little Oat Marginella 



Figure 56k 



North Carolina to both sides of Florida and the West Indies. 



% to V2 inch in length, slender, very similar to H. avefia, but usually 

 smaller, with a longer spire, more slender anterior end, and pure, opaque- 

 white in color, except for a very faint hint of straw color below the suture, 

 again at the middle of the body whorl and also near the base. Common from 

 shallow water to 750 fathoms. This is avenella Dall and succiitea Conrad. 



Hyali?ia torticula Dall Knave Marginella 



Figure 56I 



Off eastern Florida. 



% inch in length, slender, fusiform, with a tall spire which is leaning to 

 one side. Color opaque-white, glossy, and with a hint of straw-colored bands. 

 Possibly a sport of avenacea. Uncommon in deep water. 



Hyalina californica Tomlin Californian Marginella 



Santa Monica, Cahfornia, to Mexico. 



Ys inch in length, slender, aperture % the length of the entire shell, with 

 4 whorls, and colored a grayish to bright-orange with 3 distinct or obscure, 

 rather wide, spiral bands of white. Lower third of columella white and with 

 4 distinct, spiral folds. Outer lip smooth, rounded, pushed in slightly, espe- 

 cially near the central portion. Moderately common in rocky rubble under 

 stones at dead low tide. 



Genus Gibbenilina Monterosato 1884 

 (Cypraeolina CeruUi-Irelli 191 1) 



Gibberulina ovuliformis Orbigny Teardrop Marginella 



Figure 56-0 



North Carolina to both sides of Florida and the West Indies. 



Vs inch (2.5 mm.) in length, globular, glossy, opaque-white. Aperture 

 as long as the shell. Apex hidden under top of outer lip. Upper part of whorl 

 slightly shouldered. Lower third of columella with 3 or 4 small, slanting 



