HISPANIOLAN AND BAHAMAN ANNULARIIDAE ' 49 



LiNDENiPOMA, new subgenus 



In this subgenus the shell is elongate-turrited. The whorls are marked 

 by slender axial riblets extending from the summit over the periphery 

 into the umbilicus; these riblets are rendered vertebrated by the ob- 

 solete spiral threads. The group resembles typical Chondropoma in the 

 absence of tufting of the ribs at the summit and the subgenus Articuli- 

 poma in the vertebrating of the ribs, but it differs from this by the 

 absence of the false tufting. 



Type species: Chondropoma (Lindenipoma) lindenianuni Weinland. 



The group extends through the southern part of Hispaniola. 



KEY TO THE SPECIES OF THE SUBGENUS LINDENIPOMA 



Greater diameter more than 9 mm kazikum 



Greater diameter less than 8 mm lindenianum 



CHONDKOPOMA (LINDENIPOMA) KAZIKUM, new species 



Plate 9, Figure 5 



Shell elongate-turrited, pale buff, with interrupted spiral bands of 

 brown; the dots composing these bands are of irregular spacing as far 

 as their spiral separation is concerned, but coincide axially; they extend 

 over spire and base and show on the inside of the aperture. There is 

 at the tip of the nucleus a broad chestnut zone covering the anterior 

 third of the width of the whorl. Nuclear whorls 2, inflated, well 

 rounded, smooth except the last portion of the last whorl, which shows 

 the beginning of the postnuclear axial sculpture. The postnuclear whorls 

 are decidedly inflated, very strongly rounded, appressed at the summit, 

 and marked by slender, almost lamellar axial riblets, which are decidedly 

 more distantly spaced on the early whorls than on the last. On this they 

 almost equal the spaces separating them; they extend prominently 

 from the summit over the inflated periphery into the umbilicus. These 

 ribs are rendered vertebrated by the obsolete, rather closely spaced, spiral 

 threads. Suture strongly constricted; periphery decidedly inflated, well 

 rounded. The base is short, inflated, well rounded, openly moderately 

 widely umbilicated and marked like the spire. The umbilical wall bears 

 several spiral threads. The last whorl is solute for one-twentieth of a 

 turn, somewhat angulated at the posterior angle. Aperture very broadly 

 ovate; peristome simple, slightly expanded at the edge. The operculum 

 is thin, corneous, paucispiral, with the nucleus halfway between sub- 

 marginal and subcentral. 



The type (U.S.N.M. No. 493322) comes from the Dominican Re- 

 public, without definite locaHty. It is a perfect specimen having 7.3 

 whorls and measures: Length, 19.7 mm.; greater diameter, 9.6 mm.; 

 lesser diameter, 8.8 mm. The large size will at once distinguish this 

 from the other species. 



U.S.N.M. No. 315172 contains 2 topotypes from the same source. 



