CUBAN SUBFAMILY CHONDROPOMINAE TORRE AND BARTSCH 293 



CHONDROTHYRETES INCRASSATA (Wright) PfeiCFer 



Shell elongate-ovate, varying; in color from flesh-color through 

 straw-color to pale orange and even pale brown in some individuals; 

 the last w^iorl is always paler than the rest; the shell may have axial 

 varicial streaks of a little darker coloration than the ground color. 

 In two of the known races there is an orange blotch behind the peri- 

 stome. Peristome white. Nuclear whorls almost 2, forming a some- 

 what truncated apex, strongly rounded, smooth except the last portion 

 of the last turn, which shows the beginning of the postnuclear sculp- 

 ture. Postnuclear whorls inflated, strongly rounded, marked by 

 slender, retractively slanting, axial riblets, which are stronger on the 

 early turns than those succeeding them, becoming decidedly enfeebled 

 on the last whorl. The spiral sculpture consists of slender threads 

 a little stronger than the axial. The intersection of the axial riblets 

 and spiral threads form slender nodules on the early turns, while 

 the spaces enclosed between them are rectangular pits. On the last 

 whorl, however, the nodules are absent and the pits reduced to fine 

 malleations. Suture well constricted. Periphery of the last whorl 

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

 marked by the continuations of the axial riblets and spiral threads. 

 The spiral threads and axial riblets are a little stronger near the 

 umbilicus than on the posterior half of the base, forming here weak 

 nodules at their junction. Aperture broadly oval; peristome double; 

 the inner heavy and broadly expanded, covering two-thirds of the 

 outer. The outer is expanded and reflected, forming a sinus at the 

 posterior angle, the part that projects beyond the inner slightly fluted 

 at the edge and marked by concentric lines of growth; posterior to 

 the notch of the inner lip, the outer peristome is reflected as a broad 

 white callus over the umbilicus, which it completely covers, extending 

 a little less broadly upon the parietal wall, where it is appressed to 

 the preceding turn. The breathing pore is conspicuous on the parietal 

 wall about as far removed from the edge of the outer lip as it is from 

 the posterior angle. Operculum thin, paucispiral, with almost sub- 

 marginal nucleus, covered on the outside with a thin deposit of fine 

 calcareous granules, which form a somewhat radiating pattern. 



Gundlach * says of the animal of incrassata: "Animal grey, eye 

 ring and edge of operculm whitish. Antennae beautifully coral 

 colored, trending toward saffron-yellow. On the sides of the foot 

 are spots which are composed of elevated white dots." 



Chondrothyretes incrassata is distinguished from C. reticulata by 

 its much less strongly reticulated sculpture and from C. cerina by 



* Malakozool. BlStter, vol. 10, p. 183, 1862. 



