CUBAN ANNTJiJARirDAE TORRE AND' BARTSCH 265 



briation marking the posterior angle, a little broader on the outer 

 lip than on the rest; inner peristome slightly exserted. Operculum 

 typically ramsdenid. 



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

 356491, collected by Gundlach at Monte Toro, Guantdnamo, Oriente 

 Province, and presented to the U. S. National Museum by Dr. de la 

 Torre. It has 3 whorls and measures: Length, 7.4 mm.; greater 

 diameter, 4.9 mm.; lesser diameter, 3.9 mm. 



Of the animal Gundlach says (Malakozool. Blatter, vol. 6, p. 72, 

 1859): "On stones. Animal whitish with white dots which become 

 fused into spots on the foot. Head and middle of antennae ochre 

 colored. Tip of antennae blackish." 



GuNDLACHTUDORA, new subgenus 



Helicoid tudorids having the spiral sculpture stronger than the 

 axial. Peristome decidedly thickened and transversely fluted. Oper- 

 culum with the calcareous lamella reflected to touch that of the 

 succeeding whorl; lamella marked with oblique threads. 



Type: Tudora {Gundlachtudora) decolorata ([Gundlachl Pfeiffer), 



TUDORA (GUNDLACHTUDORA) DECOLORATA ([Gundlach] Pfeiffer) 



Plate 28, Figure 3 



1859. Cyclostoma decoloratvm [Gundlach] Pfeiffer, Malakozool. Blatter, vol. 



6, p. 70. 

 1863. Cyclostoma decoloratum Reeve, Conchologia iconica, no. 150. 

 1865. Choanopoma decolorata Pfeiffer, Monographia pneumonopomorum viven- 



tium, Suppl. 2, p. 107. 

 1920. Tudora {Tudorellata) decolorata Henderson and Bartsch, Proc. U. S. 



Nat. Mus., vol. 58, p. 76. 



Shell subglobular, yellowish white. Nuclear whorls 2, forming an 

 almost mucronate apex, well rounded, microscopically granulose, ex- 

 cept for the last portion of the last whorl, which shows the beginning 

 of the postnuclear sculpture. Postnuclear whorls inflated, strongly 

 rounded, marked by slightly retractively slanting, wavy axial riblets, 

 and by spiral threads which are a little stronger than the axial riblets. 

 Of these, 5 occur on the first, 7 on the second, and 10 on the last between 

 the summit and suture. The spiral threads render the axial riblets 

 strongly wavy. Suture strongly constricted. Periphery inflated, 

 well rounded. Base short, openly umbilicated, strongly rounded, 

 marked by the continuation of the axial riblets and by 8 spiral threads, 

 which are as strong as those on the spire. The axial riblets extend 

 into the umbilicus, where they become closely crowded. On the 

 umbilical wall there are 9 spiral threads, which are stronger than those 

 on the base. Last whorl solute for a fourth of a turn. Aperture 

 broadly oval; peristome double, the inner slightly exserted and slightly 



