258 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



TUDORA (EUTUDOREX) TROSCHELI PALMARITENSIS. new subspecies 



Plate 24, Figure 2 



This race comes from El Palmarito, that is, the north side of El 

 Queque near Vinales, It is small, Uke T. (E.) troscheli azucarensis, 

 from which it is readily distmguished by its much weaker sculpture 

 and scarcely indicated scallops. 



The type, U.S.N.M. No. 493431, has 3 whorls remaining and 

 measures: Length, 4.6 mm.; greater diameter, 3.4 mm.; lesser 

 diameter, 3.0 mm. 



Subgenus Ramsdenia Preston 



1913. Ramsdenia Preston, Proc. Malac. Soc. London, vol. 10, p. 323. 



Shell small, elongate-conic. Nuclear whorls forming a subglobular 

 apex followed by one or more turns, which are decidedly solutely 

 coiled, resembling a corkscrew, after which the normal coiling is 

 resumed. Most of the shells gathered are decollated at the termina- 

 tion of the solute portion. The whorls are marked by slender, subla- 

 mellar, wavy axial riblets, which are usually auriculated at the summit. 

 Scallops may also be present at intervals on the ribs of the spire and 

 the periphery may have strong scallops, which may interdigitate 

 with those at the summit of the whorls. Fine spiral lirations may or 

 may not be present on the spire. The base also may or may not 

 have spiral cords. The umbilicus, however, is always provider' with 

 spiral cords. The last whorl is solute. The axis of the * Tii is 

 hollow. Peristome double, the outer with a channel at the j erior 

 angle, which forms an auricle. Operculum rather large, cappuij,' the 

 aperture. Chondroid plate decidedly concave, that is, its outer 

 margin inward bent. Calcareous lamella broadly expanded and 

 curved to form one continuous sheet of rounded whorls, which are 

 marked by retractively curved, slender threads. 



Type: Tudora {Ramsdenia) nobilitata mir'ifica (Preston). 



KEY TO THE SPECIES OF THE SUBGENUS RAMSDENIA 



Fine spiral sculpture presjent nobilitata 



Fine spiral sculpture absent. 



Axial ribs coarse and decidedly lamellose bufo 



Axial ribs not coarse or decidedly lamellose. 



Axial ribs sublamellose. 



Periphery with a dark chestnut band notata 



Periphery without a dark chestnut band natensoni 



Axial ribs obsolete perspectiva 



TUDOHA (RAMSDENIA) NOBILITATA ([Gundlach] Poey) 



Shell small, elongate-conic, milk white. Nuclear whorls 2, forming 

 a subglobular apex, well romided, microscopically granulose, with the 



