VITRINELLIDAE 139 



Vs inch in diameter, strong, opaque-white, depressed, 4 whorls. Top of 

 whorls rounded, slightly concave just below the fine suture; bearing 5 or 6 

 major, smooth, spiral threads on top with numerous, much finer threads be- 

 tween. Periphery bordered above and below by a major cord. Umbilicus 

 widely funnel-shaped, deep. Outer lip crenulate above. Not uncommon in 

 shallow water. One of our largest American Vitrinellid species. Provisionally 

 placed in this subgenus. 



Genus Pseudomalaxts P. Fischer 1885 

 Fseudomalaxis nobilis \^errill Noble False Dial 



Virginia to southeast Florida and the West Indies. 



% inch in diameter, dull-white, planorboid, with a very flat spire and a 

 wide concave, non-umbilicate base. Periphery of shell flat, bordered above 

 and below by one or two spiral cords of small beads. Aperture squarish. 

 Operculum round, multispiral with a chitinous pimple on the inside. A rare 

 and choice collector's item. Deep water. 70 fathoms. 



Fseudomalaxis balesi Pilsbry and McGinty Bales' False Dial 



Palm Beach and along the Lower Keys, Florida. 



1.8 mm. in diameter, 3 to 4 whorls, semitranslucent-white to burnt 

 sienna. Sculpture of fine, spiral striae and strong, widely spaced, radial ribs. 

 Peripheral zone flattened or concave between 2 projecting nodulose keels. 

 Under rocks. Moderately common to rare. This genus was formerly placed 

 in the family Architectonicidae. 



Genus Teinostoma H. and A. Adams 1854 



Shells usually about 2 to 3 mm. in diameter, depressed, glossy, white, 

 usually smooth, and with an umbilical callus. They are very distinctive little 

 shells, but require a high-powered lens for their inspection. We have figured 

 only one species, but have included a key from the work of Pilsbry and 

 McGinty (1945) (see pi. lyy). 



Key to the Florida Teinostoma 



1. Umbilical callus encircled by a keel. 1.7 mm.; Palm Beach to Cape Florida. 



1 2 to 50 faths. T. (Ajinulicalhis) lituspalmarum Pils. and McG. 



2. Umbilical callus and columellar lobe not closing the umbilicus completely; 



3 mm.; southeast Forida. 80 fms 



T. (Ellipetyhts) cocolitoris Vi\s. ^nd McG. 



