136 PROCEEDINGS OF THE NATIONAL. MUSEUM Vol.89 



OPISTHOCOELICUM (OPISTHOCOELEX) PARADOXUM PARADOXUM (Torre and 



Henderson) 



Plate 9, Figure 2 



1921. Eutudora (Eutudorops) paradoxwm Torre and Henderson, Proc. U. S. 

 Nat. Mus., vol. 59, p. 264, pi. 42, figs. 8, 9. 



This race was collected by Dr. de la Torre at Monte de Santa Cruz, 

 Camagiiey Province. It is smaller than the other races and has the 

 sculpture very pronounced, in which respect it resembles 0. (0). 

 paradoxum gibbosum, but from which it is distinguished by having the 

 axial ribs uniformly developed; that is, there are no groups of 3 or 4 

 heavier riblets succeeded by an equal number of finer riblets. 



The type, U.S.N.M. No. 314964, a female, has 4.3 whorls and 

 measures: Length, 10.8 mm.; greater diameter, 6.0 mm.; lesser 

 diameter, 5.25 mm. 



A male from the same lot, a complete specimen having 6.3 whorls, 

 measures: Length, 10.0 mm.; greater diameter, 5.1 mm.; lesser 

 diameter, 4.75 mm. 



OPISTHOCOELICUM (OPISTHOCOELEX) PARADOXUM GIBBOSUM, new subspecies 



Plate 9, Figure 9 



This race was collected by Bartsch at Sitio Afuera, at the south 

 exit of Paso de la Escalera of the Cubitas Mountains, Camagiiej^ 

 Province. It is a large one. The whorls are decidedly inflated 

 and rounded, and the axial ribs on the middle turns are spaced in 

 alternating groups of coarse and fine riblets. 



The type, U.S.N.M. No. 535342, has 4.5 whorls remainmg and 

 measures: Length, 13.3 mm.; greater diameter, 7.0 mm.; lesser 

 diameter, 6.7 mm. 



OPISTHOCOELICUM (OPISTHOCOELEX) PARADOXUM MAGNUM, new subspecies 



Plate 9, Figure 3 



This is a large race that Bartsch collected at Finca Gertrudis, at 

 the foothills of the Cubitas Mountains, Camagiiey Province. It is 

 easily distinguished from the other two by its much less strongly 

 developed sculpture and by its much less rotund whorls The shell 

 is also marked by very feeble, interrupted spiral bands of brown, which 

 are rather closely spaced, and which are also arranged in very widely 

 spaced axial series. 



The type, U.S.N.M. No. 535341, has 5.0 whorls remammg and 

 measures: Length, 13.4 mm.; greater diameter, 6.7 mm.; lesser 

 diameter, 6.0 mm. 



