CUBAN SUBFAMILY CHOXDROPOMIXAE — TORRE AND BARTSCH 253 



the preceding whorl make this quite distinct from the other Chon- 

 drothyras. 



Type: Chondrothj/ra {Henderso?w?na) percrassa (Wright) Pfeiffer. 



CHONDROTHYRA (HENDERSONOMA) PERCRASSA (Wright) Pfeiffer 



Plate 15, Figure 6 



1864. lAcinn? pcrcrassa (\\'i;ight) Pfeiffkr, Malakozool. Blatter, vol. 11, p. 157. 

 1920. Chondrothyra {Chondrothijra) pcrcrassa Henderson and Babtsch, Free. 

 U. S. Nat. Mus., vol. 58, p. 63. 



Shell gigantic, chestnut-brown, the last whorl a little paler. Nuclear 

 whorls unknown. Postnuclear whorls inflated, well rounded, marked 

 by moderately strong spiral threads, which become enfeebled on the 

 last whorl. These threads are a little narrower than the spaces that 

 separate them. The axial sculpture consists of slender threads on 

 the early postnuclear whorls, which become mere lines of growth 

 on the middle whorls. On the last, faint axial impressed lines at more 

 or less regular intervals are present that in combination with the 

 reduced spiral sculpture lend a somewhat malleated eifect to its sur- 

 face. Suture well constricted. Periphery and base inflated, well 

 rounded, the latter marked like the spire but with the sculpture still 

 more reduced. Tlie last whorl is decidedly solute and descending for 

 about one-tenth of a turn. Aperture large, ovate, slightly channeled 

 at the posterior angles. Peristome double, thick, the outer moderately 

 broadly expanded and reflected on all but the parietal wall where it is 

 narrovr, somewhat fluted and marked with concentric threads; the 

 inner is also thick, reflected and adnate to the outer. A breathing pore 

 is present on the parietal wall iiear the posterior angle of the aperture, 

 a little behind the edge of the peristome. Operculum unknown. 



The s])ecimen figured, U.S.N.M. no. 492739, was collected by Wright ; 

 it has 4.5 whorls remaining and measures: Length, 42.0 mm; greater 

 diameter, 27.0 mm; lesser diameter, 21.4 mm. 



This species Pfeiffer states v;as collected by Wright at "Luis Lazo, 

 Vuelta Abajo." Arango, on the other hand,^ says : "En la cima de las 

 montanas de Luis Lazo." 



It is to be hoped that this most magnificent form, the largest of all 

 Cuban annularids, may soon be rediscovered and that the place we 

 have assigned it in our present classification may prove correct. 



Subgenus Chondrothyra Henderson and Bartsch 



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

 p. 63. 



Shell elongate-ovate, openly umbilicate, varying in color from 

 white through wax yellow, orange, brown, and even purplish, uni- 



5 Contribucion a la fauna malacologica Cubana, p. 19, 1878. 



