254 PROCEEDINGS OF THE NATIONAL MUSEUM VoL 89 



TUDORA (EUTUDOREX) UNDOSA UNDOSA ([Gundlach] Pfeiffer) 



Plate 23, Figure 4 



1863. Ctenopoma undosum [Gundlach] Pfeiffer, Malakozool. Blatter, vol. 10, 



pp. 193-194. 

 1867. Cyclostoma undosum Arango, Repert fisico natural Isla de Cubana, p. 76. 

 1920. Tudora {Tudwops) undosa Henderson and Bartsch, Proc. U. S. Nat. 



Mus., vol. 58, p. 77. 



The typical subspecies occupies the Sierra de Giiira and is much 

 smaller than the other two. 



A cotype, U.S.N.M. No. 356388, received from Gundlach, has 3.1 

 whorls remaining and measures: Length, 5.0 mm.; greater diameter, 

 4.0 nun.; lesser diameter, 3.1 mm. Its last whorl has 208 axial riblets 



tudora (EUTUDOREX) PULVERULENTA ([Wright] Pfeiffer) 



Plate 23, Figure 5 



1864. Ctenopoma pulverulentum [Wright] Pfeiffer, Malakozool. Blatter, vol. 11 



pp. 103-104. 

 1867. Cyclostoma pulverulentum Arango, Repert fisico natural Isla de Cubana, 



p. 76. 

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



Nat. Mus., vol. 58, p. 77. 



Shell elongate-conic, slender, pale yellow with the peristome and 

 interior of the aperture a little paler. Nuclear whorls decollated. 

 Postnuclear whorls inflated, strongly rounded, marked by slightly 

 retractively slanting axial riblets, of which 82 occur on the first 

 whorl, 116 on the second, 142 on the third, and 178 on the last. These 

 riblets develop into strong auricles at the summit, particularly so on 

 the last turn, and these auricles are frequently fused in groups into 

 denticles. The spiral sculpture is scarcely indicated; but the slight 

 waviness of the ribs suggests this sculpture. Suture strongly con- 

 stricted. Periphery inflated, strongly rounded. Base short, inflated, 

 strongly rounded, marked by the continuation of the axial ribs and by 

 6 spiral threads about the umbilicus. These spiral threads cover the 

 umbilical half of the base and they are strongest near the umbiHcus, 

 whore they render the axial riblets feebly scalloped. Aperture very 

 broadly oval, almost circular; peristome double, the outer expanded, 

 somewhat wavy and reflected over the umbilicus; the inner fusing 

 with the outer, and indicated only at the posterior angle. Operculum 

 typically tudorid. 



The specimen described and figured, U.S.N.M. No. 356394, is a 

 topotype received from Dr. de la Torre, collected by C. Wright 

 at Isabel Maria, Pmar del Rio. It has a little over 4 whorls and 

 measures: Length, 6.8 mm. ; greater diameter, 3.6 mm. ; lesser diameter, 

 2.7 mm. The species seems restricted to that locality. 



