HISPANIOLAN AND BAHAMAN ANNULARIIDAE 79 



CROS8EPOMA EMILIANUM INSUL-ANtTJH, new subspecies 



Plate 13, Figure 10 



This subspecies comes from Grande Cayemite Island off the north 

 coast of the south peninsula. It most nearly resembles the typical race 

 but is readily distinguished from that by its more inflated whorls and 

 less strongly developed ribs, which are also less wide. 



The type (U.S.N.M. No. 425508) has 5.3 whorls remaining and 

 bears 121 axial ribs on the last turn and 4 weak cords at the outer edge 

 of the umbilicus. It measures: Height, 16.9 mm.; greater diameter, 

 8.0 mm. ; lesser diameter, ^.2 mm. 



CROSSEPOMA AUSTEAIiE, new species 



Shell rather small, buff, unicolor, or with faint indications of inter- 

 rupted spiral bands of brown. In the typical race there is also a strongly 

 interrupted spiral band of brown on the base a little below the periph- 

 ery. Nuclear whorls 1.5, well rounded, microscopically granulose. Post- 

 nuclear whorls also well rounded and marked by slightly retractively 

 curved axial ribs, which are gathered into tufts at the summit. On the 

 early whorls spiral threads are indicated by rather strong nodules on 

 the axial ribs; these are less apparent, although more numerous, on the 

 later turns. Suture well constricted. Periphery inflated, strongly rounded. 

 Base rather openly umbilicated and marked by the continuation of the 

 axial ribs and several strong spiral cords on the outer edge of the 

 umbilicus. Aperture broadly oval, slightly angulated at the posterior 

 angle ; peristome simple. Operculum typically crossepomid. 



The species is distributed over portions of the western part of the 

 south peninsula of Haiti and the lie a Vache. 



It breaks up into two subspecies which the following key and descrip- 

 tions will help to differentiate : 



KEY TO THE SUBSPECIES OF CROSSEPOMA AUSTRALB 



Umbilical wall with 3 strong and an outer feeble spiral thread vachense 



Umbilical wall with 2 strong and an outer feeble spiral thread australe 



CROSSEPOMA AUSTRAI.E VACHENSE, new snbspecies 



Plate 13, Figure 6 



This subspecies comes from the lie a Vache. It has finer ribs and 

 feeble tufting thereof, as well as the possession of three strong spiral 

 threads and a feeble cord on the outer portion of the umbilical wall, 

 which readily distinguish it from the typical race. 



The type, U.S.N.M. No. 442849, has 103 axial ribs on the last whorl 

 and measures : Height, 10.3 mm. ; greater diameter, 6.0 mm. ; lesser 

 diameter, 4.7 mm. 



