CUBAN A]SrNUL.4RirDAE — TORRE AND BARTSCH 195 



it is a complete specimen having 7.0 whorls and measm-ing: Length, 

 17.2 mm.; greater diameter, 9.2 mm.; lesser diameter, 7.0 mm. 



OPISTHOSIPHON (OPISTHOSIPHONA) PUPOIDES BIBIJAGUAENSE. new subspecies 



Plate 15, Figure 3 



Bartsch collected this subspecies in the Sierra de Bibijagua, Isle of 

 Pines. It is decidedly smaller than the other two, and it has the 

 channeling of the suture about halfway between the two. 



The type, U.S.N.M. No. 535432, has 42 axial ribs on the first of the 

 remaining turns and 95 on the last; it has 4.4 whorls remaining and 

 measures: Length, 13.8 mm.; greater diameter, 8.0 mm.; lesser 

 diameter, 5.8 mm. 



OPISTHOSIPHON (OPISTHOSIPHONA) MORELETIANUM (Petit) 



Shell elongate-conic, varying from flesh color through buff to 

 pale brown, unicolor, or interruptedly spirally banded. The elements 

 making up the spiral bands are usually arranged in both axial and 

 spiral series. Nuclear whorls 2, well rounded, microscopically granu- 

 lose, with the last portion of the last turn showing faint indications of 

 the postnuclear axial sculpture. Postnuclear whorls strongly rounded, 

 marked by retractively curved, slender axial riblets, which are about 

 one-third as wide as the spaces that separate them. The axial riblets 

 become expanded at the summit to form slender denticles. Suture 

 moderately constricted, rendered crenulated by the denticles at the 

 summit. Periphery inflated, well rounded. Base strongly rounded, 

 openly umbilicated, marked by the continuation of the axial riblets, 

 which extend into the umbilicus. Within the umbilicus and just 

 outside of it a number of spiral threads are present. The last whorl is 

 decidedly solute. The parietal peristome may almost touch the 

 preceding whorl, but there is always at least a small slit between them. 

 Aperture oval; peristome double, the inner moderately exserted and 

 very slightly expanded ; the outer is broadly expanded and marked 

 by slender, raised, concentric lameUae; the outer peristome also 

 forms a conspicuous auricle at the posterior angle where it is slightly 

 reflected. Operculum typically opisthosiphonid. Siphon at the 

 posterior angle of the aperture immediately behind the reflected 

 peristome. 



This species comes from the Isle of Pines. 



We are recognizing two subspecies, which the following key and 

 descriptions wiU help to differentiate: 



KEY TO THE SUBSPECIES OF OPISTHOSIPHON (OPISTHOSIPHONA) MORELETIANUM 



Axial ribs of last whorl closely spaced columbense 



Axial ribs of last whorl not closely spaced moreletianura 



223580—40 5 



