CUBAN ANNULARiroAE — TORRE AND BAHTSCH 183 



We are recognizing two subspecies. These may be differentiated 

 by the following key and descriptions: 



KEY TO THE SUBSPECIES OF OPISTHOSIPHON (BERMUDEZSIPHONA) EVANIDUM 



Spiral cords of umbilical wall moderately strong evanidum 



Spiral cords of umbilical wall feeble degeneratum 



OPISTHOSIPHON (BERMUDEZSIPHONA) EVANIDUM EVANIDUM Torre and Henderson 



Plate 13, Figuke 10 



1921. Opisthosiphon (Opisthosiphona) evanidum evanidum Torre and Hender- 

 son, Proc. U. S. Nat. Mus., vol. 59, p. 258, pi. 41, figs. 1, 2. 



This subspecies was collected by Torre and Sifontes at Finca La 

 Loma, on the south-central side of the Cubitas Mountains. It 

 differs from 0. (B.) evanidum degeneratum in being larger, more robust, 

 more inflated, and apparently lacking the faint interrupted spiral 

 band of brown which is usually present in that race. In the type 

 there are 40 axial riblets on the first of the remaining turns and 136 

 on the last. 



The type, U.S.N.M. No. 314950, has a Uttle more than 4 whorls 

 remaining and measures: Length, 12.2 mm.; greater diameter, 8.3 

 mm.; lesser diameter, 6.1 mm. 



OPISTHOSIPHON (BERMUDEZSIPHONA) EVANIDUM DEGENERATUM Torre and 



Henderson 



Plate 13, Figure 3 



1921. Opisthosiphon {Opisthosiphona) evanidum degeneratum Torre and Hen- 

 derson, Proc. U. S. Nat. Mus., vol. 59, p. 258, pi. 41, figs. 3, 8. 



This subspecies was collected by Torre and Sifontes on Monte de 

 Santa Cruz, at the right of Los Cangilones. It differs from the typical 

 race in being always smaller, less inflated, more regularly conic, and 

 in usually having indications of interrupted spiral bands of brown. 

 In the type there are 40 axial ribs on the first of the remaining whorls 

 and 130 on the last turn. 



The type, U.S.N.M. No. 314956, has 4.0 whorls remaining and 

 measures: Length, 11.0 mm.; greater diameter, 7.3 mm.; lesser 

 diameter, 5.8 mm. 



OPISTHOSIPHON (BERMUDEZSIPHONA) SUBOBTURATUM Torre and Henderson 



Shell varying from broadly ovate to elongate-ovate in shape and 

 varying in color from horn colored to pale brown, unicolor or with a 

 broad spiral band of darker brown at the periphery; peristome white. 

 Nuclear whorls 2, inflated, strongly rounded, forming an almost 

 cylindric truncated apex. Postnuclear whorls inflated, strongly 

 rounded, and marked by retractively slanting axial ribs, which are. 

 distantly spaced on the early turns and which are much more closely 



