TURRIDAE 183 



7.8; greatest diam., 22 mm. Shell small, turreted, elongate, waxy 



opaque-white. 



Postnuclear whorls appressed at the summit, slightly rounded, 

 marked by very slightly retractively curved, broad, rounded axial ribs, 

 which are as broad as the spaces that separate them. Of these ribs ten 

 occur on the first, eleven on the second, twelve on the third, and on the 

 last two-thirds of a turn these become quite obsolete . . . They pass over 

 the periphery and evanesce at the insertion of the columella. The ribs and 

 intercostal spaces are marked by scarcely perceptible lines of growth. 

 Base moderately long, marked by feeble continuations of axial ribs and 

 inconspicuous spiral striations. Columella without spiral cords. Aperture 

 elongate-oval, decidedly channeled anteriorly; outer lip with a profound 

 sinus immediately below the summit and a weak stromboid notch an- 

 teriorly; inner lip covered with a heavy callus which extends over the 

 parietal wall.^s^ 



Dredged on sandy bottoms in five to seven fathoms off Sanibel 



and Captiva islands, Florida. 



Genus MONILISPIRA Bartsch and Rehder, 1939 

 Monilispira leucocymasas Dall PI. 38, fig. 263 



Alt., 14; greatest diam., 4.75 mm. Shell chocolate-brown, prom- 

 inent nodules cream-colored; apex light brown; elongate-turreted, 

 about 10 whorls; first two nuclear whorls smooth, third obscurely 

 ribbed; postnuclear whorls with a subsutural nodulose spiral cord 

 and a duplex nodulous cord at periphery of whorls; the interspace 

 concave with fine spiral striations. Below the duplex spiral of body 

 whorl are about five nodulose spiral cords and numerous spiral 

 threads. Fine spiral striation in interspaces; aperture elongate-oval, 

 outer lip varicosely thickened in adult, posterior sinus moderately 

 broad and deep, situated in concave subsutural space; anterior canal 

 short, straight; columella straight, smooth callus; operculum acute- 

 ovate, apical nucleus. 



From the littoral zone to six fathoms. Not uncommon in col- 

 onies, about sand bars of inside waters. 



Monilispira monilis Bartsch and Rehder PI. 38, fig. 264 



Alt., 13; max. diam., 5 mm. 



Shell elongate-turreted, chestnut-brown except for the tubercules, 

 which are pale yellow, the interior of the aperture reflecting the colora- 



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



338 Lat., monile, necklace; spira, a coil, twist; Gr., leucos, white; kyma, 



wool. 



