276 PROCEEDINGS OF THE JSTATIONAl. MUSEUM Vol.89 



TUDORA (WRIGHTUDORA) ENODE ([Gundlach] Pfeiffer) 



Plate 27, Figure 6 



1860. Ctenopoma enode [Gundlach] Pfeiffer, Malakozool. Blatter, vol. 7, pp. 



27-28. 

 1867. Cyclostoma enode Arango, Repert fisico natural Isla de Cubana, p. 75. 

 1920. Tudora (Tudorops) enode Henderson and Bartsch, Proc. U. S. Nat. 



Mus., vol. 58, p. 77. 



Shell elongate-conic, pale straw yellow. Nuclear whorls decollated 

 in all our specimens. Postnuclear whorls strongly rounded, marked 

 by slightly retractively slanting axial riblets, which are produced at 

 the summit, where 2 to 4 become fused to form a hollow denticle, 

 particularly on the last whorl. On the earlier whorls this fusing is 

 less strongly marked. Of the axial riblets 68 occur on the first of 

 the remaining whorls, 144 on the second, and 154 on the last. The 

 spiral sculpture consists of slender threads, which render the axial 

 riblets wavy but scarcely nodulose. Of these spiral threads, 5 occur 

 on the first, 6 on the second, and 8 on the last whorl, between summit 

 and suture. Suture strongly constricted. Periphery well rounded. 

 Base short, somewhat inflated, well rounded, marked by 3 spiral 

 cords. The narrow open umbilicus and the somewhat descending 

 and solute last whorl show the presence of 5 spiral threads on the 

 umbilical wall. Aperture almost circular; peristome double, the 

 inner moderately exserted and slightly reflected; the outer narrowly 

 expanded, somewhat auriculated at the posterior angle, and marked 

 by slender concentric laminae. Operculum typically tudorid. 



The specimen described and figured, U.S.N.M. No. 356395, is a 

 cotype collected by Gundlach and presented by Dr. de la Torre. It 

 comes from Gibara, Oriente Province. It has 3.5 whorls and meas- 

 ures: Length, 7.7 mm.; greater diameter, 4.6 mm.; lesser diameter, 

 3.9 mm. 



tudora (WRIGHTUDORA) ARCTICORONATA, new species 



Plate 27, Figure 4 



Shell elongate- turreted, pale yellow. Nuclear whorls 2, inflated, 

 strongly rounded, microscopically granulose, forming a somewhat 

 mammillated apex. Postnuclear whorls with an angulation on the 

 middle of the turn marked by rather strong, lamellar axial ribs, 

 between which finer axial riblets occur. The strong axial ribs are 

 scafloped at intervals, and when these scallops are broken they reveal 

 that they are hollow. The strong axial ribs are decidedly auriculated 

 at the summit but they do not fuse to form cusps. Of the scaUops 

 4 are present between the summit and the periphery, and the cusps at 

 the summit indicate a fifth. Suture constricted, bridged by the cusps 

 at the summit and by the scallops at the periphery. Base short, well 



