210 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



The following key will help to distinguish the three subspecies here 

 recognized : 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMA) GLABRATUM 



Umbilicus moderately broad glabratum 



Umbilicus narrow. 



Whorls decidedly inflated fortunatum 



Whorls less inflated acklinsense 



chondropoma (chondropoma) glabratum glabratum reeve 



Plate 35, Figure 7 

 1863. Chondropoma glabratum Reeve, Conchologia iconica, vol. 14, pi. 2, fig. 12. 



This race, which comes from Crooked Island, has rather conspicuous 

 color markings and is a little more widely umbilicated than the other 

 two. The expanded lip is also heavier. 



The specimen described and figured (U.S.N.M. No. 39i833) has 3.3 

 whorls remaining and measures: Length, 15.3 mm.; greater diameter, 

 10.2 mm.; lesser diameter, 7.4 mm. This and 28 additional specimens 

 were taken at the northeast point of Crooked Island by Bartsch. 



U.S.N.M. No. 391773 contains i specimen collected by Bartsch at 

 North West Point, Crooked Island. 



U.S.N.M. No. 390372 contains 4 specimens collected by Bartsch at 

 Rocky Point, northeast end of Crooked Island. 



U.S.N.M. No. 124395 contains i specimen received from Weinland 

 labeled "seniilabre Lamarck, Crooked Island." 



CHONDROPOMA (CHONDROPOMA) GLABRATUM FORTUNATUM, new subspecies 



Plate 35, Figure 6 



This subspecies averages a little larger in size than typical Chondro- 

 poma (Chondropoma) glabratum glabratum. It is more elongate and has 

 a narrow umbilicus and less strongly developed peristome. It comes from 

 Fortune Island. 



The type (U.S.N.M. No. 469i34) I collected near Albert Town. It 

 has 4 whorls remaining and measures: Length, 17.7 mm.; greater di- 

 ameter 10.4 mm. ; lesser diameter, 9.2 mm. 



We also collected this race at various other stations on Fortune Island. 



U.S.N.M. No. 391434 contains 16 topotypes from the same source. 



U.S.N.M. No. 168324 contains 12 specimens collected by Henderson 

 on Fortune Island. 



U.S.N.M. No. 391744 contains 6 specimens collected by Bartsch on 

 the east side of the lagoon on Fortune Island. 



U.S.N.M. No. 391751 contains 3 specimens collected by Bartsch at 

 Walker Bay, Fortune Island. 



U.S.N.M. No. 391608 contains 153 specimens collected by Bartsch 

 on the south side near the upper landing on Fortune Island. 



U.S.N.M. No. 392728 contains 146 specimens collected by Bartsch 

 on the south side near the upper landing on Fortune Island. 



