CUBAISr SUBFA:MILY CHOXDROPOIMIXAE TORRE AND BARTSCH 233 



CHONDROPOMETES (CHONDROTHYROMA) SCOPULORUM PERPLEXUM, new subspecies 



Plate 12, Figure 7 



Shell small, white, with the ribs sublamellar, rather closely spaced. 

 Spiral threads in the umbilicus feeble ; peristome broadly expanded. 



The type, U.S.N.M. no. 367748, was collected by Aguayo and Ber- 

 mudez on Mogote Colorado near San Diego de los Banos, on the 

 east side of the Rio San Diego. It has 4.1 whorls remaining and 

 measures : Length, 17.9 mm ; greater diameter, IG.O mm ; lesser diam- 

 eter, 11.5 mm. 



Specimens of this subspecies have been found without breathing 

 pore. We have also specimens from Mogote Bosque. 



CHONDROPOMETES (CHONDROTHYROMA) BELLISIMUM, new species 



Plate 11, Figure 10 



Shell rather large, bright red except for the broadly reflected 

 peristome, which is yellowish white. Operculum red. The axial 

 ribs are rather low and closely spaced, the spaces between them on 

 the last whorl being almost as narrow^ as the ribs. The last half of 

 the last whorl also shows poorly developed spiral threads, which are 

 best developed on the base. The umbilical wall is also marked by 

 conspicuous spiral threads. This species recalls C. (C.) eximium 

 exhn'mm but can at once be distinguished from that by the absence 

 of the dark axial band immediately behind the peristome, by the 

 much lower and more closely spaced axial ribs, and by its having 

 the spiral striations on the last whorl referred to above. 



The type, U.S.N.M. no. 367743, was collected by Arango at Mogote 

 del Boscjue de Galalon. It has 4.5 whorls remaining and measures: 

 Length, 19.3 mm; greater diameter, 17.8 mm; lesser diameter, 

 11.9 mm. 



HENDERSONINA, new genus 



Brilliantly colored shells, varying in shape from broadly to nar- 

 rowly ovate to elongate-turreted. The early nuclear whorls are 

 smooth, the first portion of the first postnuclear whorl showing 

 axial threads that soon develop into axial riblets on the succeeding 

 portions of the shell. Beginning with the last part of the first post- 

 nuclear whorl, spiral threads make their appearance, which ren- 

 der the axial riblets nodulose at their junction on the early post- 

 nuclear whorl. The axial and spiral sculpture may both become 

 enfeebled beyond the first half of the spire, as in Hendersonina 

 (Hendersonina) hendersoni, or persist quite strongly to the end, as 

 in some of the races of H. {Flendersonida) discolorans and H. {Sco- 

 hinapoma) scobina. The suture may or may not be crenulated. 



