HISPANIOLAN AND BAHAMAN ANNULARHDAE 23 



Peristome double. 



Outer peristome broadly expanded. 



Expansion of peristome of same width all around ignotum 



Expansion of peristome not of same width all around; 

 outer peristome of inner lip narrower than the rest. 



Shell large, diameter more than 16 mm asymmetricum 



Shell smaller, diameter less than 13 mm inaequilabrum 



Outer peristome not broadly expanded. 



Outer peristome auriculated at posterior angle beatense 



Outer peristome not auriculated at posterior angle. 



Surface with a watered-silk color eflFect gimbiense 



Surface without a watered-silk color effect eusarcum 



CHONDROPOJtA (CHONDBOPOMIUM) SCPERBUM Henderson and Slmpsan 



Plate 5, Figure 1 



1902, Chondropoma superba Henderson and Simpson, Nautilus, vol. 16, pp. 



88-S9. fig. 

 1920. Chondropoma (Chondropomium) weinlandi superba Henderson and 



Bartsch, Proc. U. S. Nat. Mus., vol. 58, p. 60. 



Shell large, elongate-conic, flesh-colored, with interrupted spiral bands 

 of brown of somewhat varying strength. These brown markings are of 

 varying length but terminate on the same axial rib, which gives them 

 an axial as well as a spiral arrangement. Nuclear whorls 2, well rounded, 

 forming an almost truncated apex; smooth, except the last half of the 

 last turn, which shows slight indications of axial threads. Postnuclear 

 whorls moderately rounded, slightly contracted a little below the 

 summit, which is narrowly shouldered. The whorls are marked by 

 slightly retractively curved axial ribs of which 140 occur upon the last 

 turn, not counting the fine threads immediately behind the lip. These 

 ribs extend strongly upon the summit where they become slightly 

 strengthened, rendering the shoulder crenulated. Suture channeled. Pe- 

 riphery well rounded. Base narrowly, openly umbilicated, marked by 

 the continuations of the axial ribs, which bend into the umbilicus; the 

 umbilicus wall is marked by 11 spiral threads of somewhat varying 

 strength and spacing. The last whorl is solute for about one-fifth of the 

 turn, its summit forming a strong crenulated carina, while the outside 

 of the parietal wall is marked by the feeble continuations of the axial 

 ribs, which here appear as mere lines of growth. Aperture oval; peri- 

 stome strongly expanded, reflected and thickened on the outer and basal 

 lips, the inner lip being but slightly expanded and reflected. Operculum 

 paucispiral with excentric nucleus, the last whorl covered with a fine 

 granular calcareous deposit which is thickest on the columellar border. 



The type, U.S.N.M. No. 168798, was collected by Henderson and 

 Simpson near Thomazeau, Haiti. It is a complete specimen, having 7.8 

 whorls, and measures: Length, 27.6 mm.; greater diameter, 13.9 mm.; 

 lesser diameter, 10.9 mm. 



U.S.N.M, No. 503985 contains 373 topotypes from the same source. 



