l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. QI 



periphery. Postnitclear whorls moderately well rounded, marked by 

 somewhat sinuous, retractively slanting axial ribs, of which 12 occur 

 upon the first, second, and third, 14 upon the fourth, 16 upon the 

 fifth, 18 upon the sixth, and 20 upon the last whorl. These ribs 

 become somewhat attenuated on the shoulder near the summit, where 

 they are somewhat bent to correspond to the posterior channel. In 

 addition to this the whorls are marked by rather strong spiral cords, 

 of which one occurs upon the first, two upon the second and third, 

 three upon the fourth, and four upon the remaining turns excepting 

 the last, which has five. These cords are of about equal strength, 

 and the first of them is about one fourth the distance between the sum- 

 mit and suturo anterior to the summit. The intersection of the axial 

 ribs and spiral cords form elongate nodules having their long axes 

 parallel to the spiral cords. In addition to this the entire surface of 

 the axial ribs and intercostal spaces are marked by lines of growth. 

 Suture moderately constricted. Periphery well rounded. Base mod- 

 erately long, marked like the spire, bearing four nodulose cords. Colu- 

 mella rather long, moderately stout, marked by 17 spiral cords and 

 threads, which grow progressively weaker anteriorly, the last six being 

 very feebly indicated. Aperture rather large, outer lip with a very 

 strong varix a little behind its edge, from which a clawlike element 

 projects into the aperture, bearing the external sculpture on its outer 

 surface. This structure, together with a rather strong denticle on 

 the parietal wall, gives to the posterior channel an almost tubular 

 effect. Inner lip covered with a thick callus, which is reflected over 

 the columella and the parietal wall. 



Type. — U.S.N.M. no. 41 1799, collected by Mr. Henderson's yacht 

 Eolis at station 153, 3^ miles southeast of Fowey Light. It has 9.5 

 whorls and measures : Length, 12.4 mm ; diameter, 4.5 mm. 



There are 65 additional lots in the collection of the National Museum 

 from various stations along the Florida coast. 



GLYPHOSTOMA (GLYPHOSTOMOPS) GENOA, n. sp. 



Plate 5, figs. I, 3. 4 



Shell small, slender, shiny, pale yellow. Nuclear whorls a little more 

 than three, the first well rounded, the second with a very feeble angu- 

 lation, and the third with a submedian carina. Postnuclear whorls 

 marked by 10 irregularly developed, protractively slanting axial ribs, 

 which evanesce in the sinus at the summit and at the periphery. These 

 irregular callus-like ribs are about one third as wide as the spaces 

 that separate them. In addition to this axial sculpture the whorls are 



