CUBAN ANNULARIIDAE TORRE AND BARTSCH 225 



XENOPOMA HENDEKSONI. new species 



Platj, 19, Figure 3 



Shell elongate-conic, flesh colored with a pinkish tinge, the tip and 

 the peristome white. Nuclear whorls 2, forming a conspicuous mam- 

 millated apex, with the whorls inflated and microscopically granulose, 

 and the last portion of the last turn showing the beginning of the post- 

 nuclear sculpture. Postnuclear whorls strongly rounded, marked by 

 strongly raised slender spinose axial lamellae, between which 4 to 8 

 finer axial threads are present. Of these lamellae, 24 occur on the 

 first turn of the type, 22 on the second and tliird, 24 on the fourth, 26 

 on the fifth, and 32 on the last whorl. The lamellae on the first turn 

 bear no spines, on the second there are 2, on the third and fourth 3, 

 on the fifth 4, and on the sixth 6 between the summit and the suture. 

 Suture strongly constricted. Peripher}^ strongly rounded. Base well 

 rounded, openly umbilicated, marked by the continuation of both the 

 strong and the weak axial sculpture. The lamellae bear 3 slender 

 spines. Within the umbilicus the wall is marked by the contmuation 

 of the axial threads and by much enfeebled lamellae. These are 

 crossed by 9 spiral threads, which render their junctions with the 

 axial lamellae minutely spinose. The last whorl is solute for a little 

 more than half a turn. Aperture subcircular; peristome double, the 

 inner slightly exserted; the outer broadly expanded on the outer and 

 basal lip, less so on the inner and parietal, fluted and slightly digitated 

 at the external margin. Operculum typically xenopomid. 



The type, U.S.N.M. No. 493390, was collected by Mr. Henderson 

 at Farallon de Nipe, Oriente Province. It has 8.2 whorls remaining 

 and measures: Length, 14.0 mm.; greater diameter, 7.6 mm.; lesser 

 diameter, 6.1 mm. 



This species is easily distinguished from the other members by the 

 presence of fine spines on the umbilical wall. 



XENOPOMA HYSTRIX ([Wright] Pfeiffer) 



Plate 19, Figure 2 



1861. Cyclostoma pterosiomurn [Gundlach] Poey, Memorias sobre la historia natu- 



ral de la isla de Cuba, vol. 2, p. 405, nomen nudum. 



1862. Choanopoma hystrix [Wright] Pfeiffer, Malakozool. Blatter, vol. 8, pp. 



221-222. 

 1890. Xenopoma hystrix Crosse, Journ. Conchyl., vol. 38, pp. 283-284, pi. 5, 



fig. 2. 

 1920. Xenopoma hystrix Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 



58, p. 68. 



Shell very elongate-conic, flesh colored. Nuclear whorls a little 

 more than 2, well rounded, microscopically granulose, forming a 

 conspicuous mammillated apex with the last portion of the last turn 



