260 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



bear 67 axial ribs on the first, 94 on the second, and 103 on the third. 

 In addition to these ribs, the base has three weak spiral cords, and the 

 umbilical wall bears 7 strong cords on its anterior two-thirds; these 

 cords render the axial riblets decidedly scalloped. The specimen 

 figured measures: Length, 5.5 mm.; greater diameter, 3.2 mm.; lesser 

 diameter, 3.0 mm. 



TUDORA (RAMSDENIA) NOBILITATA MIRANDENSIS, new subspecies 



Plate 24, Figuke 7 



This subspecies was collected by Dr. Pilsbiy at Tibisi near Miranda, 

 Oricnte Provmcc. 



This race agrees with T. {R.) nobilitata nohilitata in the strength of 

 its spiral lirations of the spire, but it is easily distinguished from 

 nobilitata by its larger size and much more numerous and finer spiral 

 cords on the umbilical wall. 



The type, U.S.N.M. No. 535667, has 3.8 whorls remaining and 

 measures: Length, 10.0 mm.; greater diameter, 3.9 mm.; lesser diam- 

 eter, 3.7 mm. The first of these whorls has 54 axial riblets, the second 

 82, the third 102, and the last eight-tenths of a whorl has 94 axial 

 riblets. The base is marked by four feeble spiral threads, and the 

 umbilical wall has 14. 



TUDORA (RAMSDENIA) NOBILITATA MIRIFICA (Preston) 



Plate 24, Figures 6, 9 



1913. Choanopoma (Ramsdenia) mirifica Preston, Proc. Malac. Soc. London. 



vol. 10, p. 323, figured. 

 1920. Ramsdenia mirifica Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 



58, p. 79. 



This subspecies was collected by Dr. Ramsden at Bayate near 

 Concepcioncita, northwest of Guantdnamo, Oriente Provmce. It 

 belongs to the group in which the spiral lirations are inconspicuous, 

 and the spiral cords on the umbilical wall are few and strong. 



The specimen described and figured, a cotype, U.S.N.M. No. 356482, 

 has 3 whorls remaining, of which the first has 86 riblets, the second 97, 

 and the last 114. The axial riblets terminate in conspicuous auricles 

 at the summit and interlock with denticles at the periphery of the 

 preceding turn. The base has mere indications of spiral threads, 

 while the umbilical wall shows 6 strong cords. The specimen figured 

 measures: Length, 5.9 mm.; greater diameter, 3.5 mm.; lesser diam- 

 eter, 3.0mm. 



