CUBAiS^ SUBFAMILY CHONDKOPOMINAE TORRE AND BARTSCH 391 



inside of the outer lip. Nuclear whorls decollated ; postnuclear whorls 

 very strongly inflated and very strongly rounded, marked by closely 

 spaced, retractively slanting axial riblets and spiral threads of about 

 the same strength. Both of these are much stronger on the early 

 whorls tlian on the last. The comljination of these two elements gives 

 a fenestrated pattern to the sculpture. The axial riblets render the 

 summit of the turns feebly denticulated. Suture strongly constricted. 

 Periphery decidedly inflated, strongly rounded. Base short, inflated, 

 strongly rounded and marked on the posterior half like the spire, 

 while anteriorly it bears a number of strong spiral cords. Umbilicus 

 very broad, its wall marked with slender spiral threads which become 

 a little stronger toward the outer margin. Aperture broadly oval; 

 peristome double, the outer flaringly expanded, forming a very con- 

 spicuous auricle at the posterior angle a little narrower on the 

 parietal wall. Inner peristome also expanded and reflected over the 

 outer, which it almost half covers. Operculum thin, corneous, pauci- 

 spiral with subcentral nucleus, the outside covered with a thin layer 

 of calcareous granules. 



The type, U.S.N.M. no. 367817, was collected by Dr. de la Torre 

 near Baire. It has 4 whorls remaining and measures : Length, 16.2 

 mm ; greater diameter, 13.2 mm ; lesser diameter, 10.4 mm. 



This, the type of the subgenus Gutierrezium., is easily differentiated 

 from all the other forms of this subgenus by its strong spiral sculpture. 



CHONDROPOMA (GUTIERREZIUM) CANALICULATUM, new species 



Plate 3.S, Figure 5 



Shell very broadly ovate, the early whorls chestnut -brown, the suc- 

 ceeding turns yellowish flesh-color, the last one flesh-color, marked 

 with interrupted spiral bands of chestnut-brown, which are arranged 

 also in axial series. Four of these bands occur on the spire and three 

 on the base. These are very conspicuous on the outer and basal lip, 

 as well as on the outer peristome. Nuclear whorls 1.8, strongly 

 rounded, marked with miscroscopic granulations only. Postnuclear 

 wdiorls inflated, strongly rounded, marked by decidedly retractively 

 slanting axial riblets, which serrulate the margin of the channeled 

 suture. These riblets are a little more distantly spaced on the early 

 turns than on the last. In addition to this, the whorls are marked by 

 feeble spiral threads, too feeble to more than merely render the axial 

 riblets vertebrated at their junction. Suture strongly constricted; 

 periphery inflated, strongly rounded. Base short, inflated, strongly 

 rounded, very openly umbilicate, and marked like the spire but with 

 the spiral lirations a little stronger. The umbilical wall, however, is 

 marked by very strojig spiral threads. Aperture broadly ovate, 

 decidedly auriculated at the posterior angle. Peristome double, the 



