CUBAN ANNULARIIDAE TORRE AND BARTSCH 253 



summit these ribs fomi slight auricles which touch the preceding 

 whorl where occasionally several of them become fused. They also 

 become expanded near the bottom on the early tm'ns and thus 

 form a more or less interlockuig element at the suture. The spiral 

 sculpture consists of feeble threads, which render the axial riblets 

 wavy or vertebrated. Suture very strongly constricted. Periphery 

 well romided. Base marked like the spire, but with the spiral cords 

 more pronounced. Aperture broadly ovate; peristome double, the 

 umer slightly exserted; the outer broadly expanded, widest on the 

 inner lip, notched in the middle and reflected posterior to the notch 

 over the umbilicus, which it completely covers. It is also marked 

 by slender, concentric laminae. Operculum typically tudorid. There 

 is a breathing puncture on the parietal wall near the posterior angle 

 of the aperture. 



This species ranges from Lagunillas de Consolacion east to the 

 Sierra de Giiira, San Diego de los Banos. 



We are recognizing three subspecies, which the accompanying key 

 and descriptions will help to differentiate : 



KEY TO THE SUBSPECIES OF TUDORA (EUTUDOREX) UNDOSA 



Spiral sculpture obsolete on last whorl laureani 



Spiral sculpture not obsolete on last whorl. 



Shell large, length more than 9 mm barroi 



Shell small, length less than 6 mm undosa 



TUDORA (EUTUDOREX) UNDOSA LAUREANI, new subspecies 



Plate 23, Figure 8 



This race was collected by Laureano Pequeno at Mogote EJ Arabd, 

 La Ceja near Lagunillas de Consolaci6n, San Juan y Martinez. It 

 differs from the other large member, T. (E.) undosa barroi, in having 

 the spiral sculpture of the last whorl obsolete, and in being smaller 

 and less elongate-conic. Here lilcewise the axial ribs are much more 

 frequently gathered into tufts at the summit. 



The type, U.S.N. M. No. 493422, a complete specimen, has 6.2 

 whorls and measures: Length, 9.1 mm.; greater diameter, 5.3 mm.; 

 lesser diameter, 4.4 mm. 



TUDORA (EUTUDOREX) UNDOSA BARROI. new subspecies 



Plate 23, Figuhe 7 



This subspecies comes from the mogote lymg about Kilometer 14 

 on the road between Pmar del Rio and Vinales. It is larger than 

 any of the other races, and it is easily dift'erentiated from T. (E.) 

 undosa laureani by its more elongate form and strong spiral sculpture 

 on the last whorl. 



The type, U.S.N.M. No. 356468, a decollated specimen having 3.3 

 whorls, measures: Length, 9.4 mm.; greater diameter, 5.4 mm.; 

 lesser diameter, 5.0 mm. 



