CUBAN ANNULIARIIDAE — TORRE AND BARTS€H 231 



Subgenus Parachondrops Henderson and Bartsch 



1920. Parachondrops Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, 

 pp. 66-67. 



Shell elongate-conic. Nuclear whorls about 2, the first smooth, 

 except for microscopic granules; the second also very strongly rounded 

 and marked by fine, hairlike, retractively curved axial riblets, which 

 are relatively more closely spaced than the axial ribs on the post- 

 nuclear whorls. We have here an acceleration of the postnuclear 

 sculpture extending over half of the nuclear turns. The axial sculp- 

 ture of the postnuclear whorls consists of slender sublamellar riblets, 

 which are rendered wavy or articulate by the ill-defined spiral sculp- 

 ture. Operculum typically parachondroid. 



Type: Parachrondria (Parachrondrops) campbelli (C. B. Adams). 



KEY TO THE SPECIES OF THE SUBGENUS PARACHONDROPS 



Decollated shell more than 13 mm. long. 



Outer peristome narrow, of the same width all around wrighti 



Outer peristome not narrow or of the same width all around. 

 Sculpture strong. 



Whorls inflated, rotund erecta 



Whorls not inflated, well rounded lurida 



Sculpture feeble abtiana 



Decollated shell not more than 11 mm. long. 



Last whorl decidedly solute daudinoti 



Last whorl adnate or almost so. 



Basal spiral threads rather strong chordata 



Basal spiral threads obsolete nigricula 



PARACHONDRIA (PARACHONDROPS) WRIGHTI (Pfeiffer) 



Plate 20, Figure 5 

 1862. Tudora wrighti Pfeiffer, Malakozool. Blatter, vol. 9, p. 4, pi. 1, figs. 4, 5. 



Shell elongate-conic, thin, semitranslucent. Nuclear whorls decol- 

 lated. Postnuclear whorls only moderately rounded, marked by 

 low, retractively curved, slightly wavy axial riblets, which become 

 almost obsolete on the last turn. Some of these riblets become 

 expanded and form hollow tufts at the summit. The spiral sculp- 

 ture is just sufficiently indicated to render the axial riblets artic- 

 ulate, but scarcely noticeable on the last whorl. Suture moder- 

 ately constricted. Periphery inflated, strongly rounded. Base 

 rather short, inflated, strongly rounded, openly umbiiicated, and 

 marked by the feeble continuation of the axial ribs and, near the 

 umbilicus, by a few weak spiral threads. Aperture oval; peristome 

 double, the outer very slightly expanded, slightly am-iculate at the 

 posterior angle, very narrow, scarcely projecting beyond the inner, 

 which is also reflected on the outer lip and only a little so on the 



