258 American Seashells 



Vs inch in length, resembhng a miniature apicimmt, but pure white in 

 color. Like Gibberulina ovuHforims, but the aperture is not so long and has 

 microscopic, spiral teeth inside the thin, curled-in outer lip. Columella with 

 4 oblique folds. Alias M. lavalleaiia Orb. Common in shallow water to 40 

 fathoms. The subgenus Granula Jousseaume 1874 is this subgenus. 



Persicula jeivetti Carpenter Jewett's Marginella 



Monterey, California, to Lower California. 



/4 inch (5,0 mm.) in length, snow-white, glossy, rather stout. Apex 

 smoothed over and obscured. Outer lip smooth, slightly curled inward. Col- 

 umella with 3 or 4 rather distinct, slanting, spiral folds with several smaller 

 ones higher on the columella. Common from low tide to several fathoms. 



There are 3 similar, small and white species which are very difficult to 

 separate; and according to some workers, size and proportionate dimensions 

 are of significance: 



F. regzilaris Cpr. (Regular Marginella), Monterey to Lower California. 



Length 3.3 mm., ratio of diameter to length i to 1.5. Low tide to 



30 fathoms. Common. 

 P. subtrigona Cpr. (Triangular Marginella), Monterey to Lower Cah- 



fornia. Length 3.5 mm., ratio of diameter to length i to 1.25. Low 



tide to 50 fathoms. Uncommon. 

 P. politula Dall (Polite Aiarginella), Santa Barbara to Lower California. 



Length 3.0 mm., ratio of diameter to length i to 2. Low tide to 20 



fathoms. Uncommon. 



Genus Hyalina Schumacher 18 17 

 Subgenus Voharina Hinds 1844 



Hyaliva avena Valenciennes Orange-banded Marginella 



Plate I ip; figure 56i 



North Carolina to Key West and the West Indies. 



M to % inch in length, slender; spire pointed, but short. Outer lip curled 

 in, white and smooth. Aperture narrow above, wide below. 3 to 4 slanting, 

 columellar teeth. Color whitish, cream or yellowish with 4 to 6 spiral bands 

 of subdued orange-tan. A moderately common, shallow-water species. The 

 pink variety, especially common in Yucatan has been given the name beyer- 

 leana Bern. 



Hyalina veliei Pilsbry Velie's Marginella 



West coast of Florida. 



