No. 2327. THE ANNULARIIDAE— HENDERSON AND BARTSCH. 81 



The color is ashy white without color markings of any sort. The 

 sculpture consists of sublamellar riblcts which are more widely spaced 

 on the upper whorls and more or less unevenly spaced on all the 

 whorls. Some of these riblets project above the rather deeply im- 

 pressed suture in thin, somewhat flexuous lamellae, sometimes touch- 

 ing a riblet of the whorl above, and giving the appearance of a con- 

 tinuous riblet crossing the suture. The spiral sculpture is confined 

 to several nodulose cords within the umbilicus. The aperture is ver- 

 tical and subcircular, the inner peritreme of the peristome is not pro- 

 jecting; the outer peritreme is moderately expanded throughout, 

 slightly more so in its outer portion and in the lower inner portion 

 slightly fluted or showing a tendency in some specimens to fimbria- 

 tion. The surface of the expanded outer peritreme is coarsely con- 

 centrically laminated. Just within the aperture near the posterior 

 margin is a breathing pore which communicates with a prominent 

 siphon without, which projects upward and then curves inward and 

 do\^Tiward almost to touch the preceding whorl; the siphon presents 

 a coarsely ribbed surface. 



The operculum is typical of the genus. 



Tyije.—Cat. No. 314942, U. S. N. M., measures: Length, 7.8 nam.; 

 major diameter, 4 mm.; minor diameter, 3.8 mm.; length of aperture 

 within peristome, 1.75 mm. 



The type is selected from a large number of specimens collected by 

 Charles T. Simpson and J. B. Henderson at the Soledad plantation 

 at Cienfuegos, in the Santa Clara Provmce, Cuba. 



No notable variation is observable throughout the large series of 

 specimens. The opercular characters remove this species from 

 Rhytidopoma, to the members of which genus this shell bears a strong 

 resemblance in its general facies. 



TUDORA (TUDORA) ABBOTTI. new species. 



The shell is elongate-conic, with seven whorls including the apex, 

 the last nonsolute, openly umbilicated. The color is yellowish straw 

 and further ornamented by 8 to 10 chestnut-colored interrupted 

 spiral bands. On the last two whorls these bands are arranged in 

 both axial and spiral series. The extreme tip is chestnut, the other 

 nuclear whorls being of lighter color. The nuclear whorls are smooth; 

 the postnuclear turns are marked by well-rounded, retractively 

 curved axial riblets, some of which at irregular intervals become 

 thickened at the summit, where they sometimes fuse with neigh- 

 boring riblets, thus forming an irregularly denticulated suture. The 

 spiral sculpture consists of feeble, low, rounded cords, of which there 

 are 20 between the summit and the periphery on the last turn. 

 These cords render the axial riblets feebly tuberculated at their 

 181404— 21— Proc.N.M. vol. 58 G 



