HISPANIOLAN AND BAHAMAN ANNULARIIDAE 135 



lepoma mutabile I have described a complex occupying the region about 

 Saltrou, which is situated on the south coast near the eastern Hmit of 

 Haiti. This complex appears exceedingly abundant in this region, at least 

 the hundreds of specimens before me collected by Orcutt would indicate 

 this. It is exceedingly variable, both in size and sculpture, the latter 

 covering details of all the species here described under Sallepoma. 

 There is a possibility that we are here dealing with a hybridization prod- 

 uct resembUng the results I have obtained in my breeding of Cerions, 

 which also produced an endless number of mutations. The lo specimens 

 figured show the major variants and will delineate the problem better 

 than words. 



Genus CLYDONOPOMA Pilsbry 



1933. Clydonopoma Pilsbry, Proc. Acad. Nat Sci. Philadelphia, vol. 85, p. 127. 



Shell varying from elongate-ovate to turbinid in outline. Postnuclear 

 whorls marked by almost vertical axial ribs, which extend over the base 

 and umbilical wall. The spiral sculpture may be confined to the umbilicus 

 (subgenus Clydonopoma) or there may be indications of a couple of 

 spiral threads near the summit of the turns. Suture narrowly channeled. 

 Base openly umbilicated. Last whorl solute. Peristome double, the outer 

 narrowly expanded. Operculum with a pseudolamella. 



Type species: Clydonopoma nobile (Pfeiffer). 



KEY TO THE StTBGENERA OF CLYDONOPOMA 



Spiral sculpture confined to umbilical wall Clydonopoma 



Spiral sculpture not confined to umbilical wall; axial ribs with a 



few feeble nodules near summit Eccritopoma 



Subgenus Clydonopoma Pilsbry 



Clydonopomas having an ovate outline and the spiral sculpture con- 

 fined to the umbilical wall. 



Type species: Tudora nobilis Pfeiffer = Clydonopoma (Clydono- 

 poma) nobile (Pfeiifer). 



CLYDONOPOMA (CI.YDONOPOMA) NOBILE (Pfeififer) 



Plate 21, Figure 3 



1852. Tudora nobilis Pfeiffer, Monographia pneumonopomorum viventium, p. 252. 



1854. Cyclostoma nobile (Tudora) Pfeiffer, Proc. Zool. Soc. London, 1852, 

 p. 142, pi. 13, fig. 2. 



1920. Chondropoma (Chondropomium) nobilis Henderson and Bartsch, Proc. 

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



1933. Parachondria (Clydonopoma) nobilis Pilsbry, Proc. Acad. Nat. Sci. Phila- 

 delphia, vol. 85, pp. 127-128, pi. 6, figs. 14, 16-19. 



Shell large, very regularly elongate-ovate, white, with faint inter- 

 rupted spiral bands of brown, the elements of which are arranged in 

 both axial and spiral series. Of these bands six are present between the 

 summit and the periphery. Nuclear whorls decollated in all our speci- 

 mens. Postnuclear whorls well rounded, rather broadly shouldered at 



