130 BULLETHOSr 181, UNITE© STATEiS NlATTOQSnAIL MUSEUM 



This race was collected by C. R. Orcutt at Carisbrook and by 

 Dr. Welch at Kyle and Bartons. It therefore seems to occupy the 

 north-central portion of St. Elizabeth Parish. 



APEROSTOMA (CYCLADAMSLA.) SEMINUDUM DEBURGHAEANUM (Chitty) 



Plate 18, Figures 35-37 

 1857. Cyclotus dehurghaeanus Chitty, Proc. Zool. Soc. London, vol. 25, p. 151. 



This subspecies was differentiated from typical seminudwm by 

 Chitty chiefly on the basis of its more elevated form, narrower 

 umbilicus, and flatter operculum, and possibly a little feebler sculpture 

 of the base, for in both of these subspecies there is a tendency toward 

 obsoleteness of sculpture. I have found in examining series of 

 specimens tliat the relative concavity of the operculum is a variable 

 element, and the width of the umbilicus is also variable, as is the 

 elevation, and for this reason I am relegating Chitty's species to 

 subspecific rank. 



The specimen figured, U.S.N.M. No. 535986, was collected by Dr. 

 Welch west of Headings, Trelawny Parish, Jamaica. This has 5 

 whorls and measures : Height, 20.0 mm. ; greater diameter, 25.3 mm. ; 

 lesser diameter, 18.0 mm. 



Chitty cites Westmoreland (?) as the type locality. I believe that it 

 occupies northern Manchester and southern Trelawny Parishes, 

 extending into the edge of southeastern St. James Parish. 



APEROSTOMA (CYCLADAMSIA) SEMINUDUM SEMINUDUM (C. B. Adams) 



Plate 18, Figures 32^-34; Plate 42, Figuees 4, 5 



1851. Cyclostotna seminudum C. B. Adams, Ann. Lye. Nat. Hist. New York, vol. 

 5, p. 59. 



This subspecies is a little less elevated than A. {€.) seminudum 

 deburghaeanum (Chitty) and a little more roughly sculptured. It 

 also has a much broader umbilicus and it, like deburghaeanum^ has 

 a feeble sculpture on the base, where it fails to extend to the periphery. 



Adams cites Manchester, Jamaica, as the type locality. Chitty, in 

 restricting seminudum^ says that it comes from the northwest border 

 of Manchester Parish; he specifically mentions Bogue Hill. I be- 

 lieve that this subspecies ranges from Somerset, Manchester Parish, 

 in a northwesterly direction to Phoenix, St. James Parish. 



The specimen figured, U.S.N.M. No. 6642, was received from C. B. 

 Adams. It has 5 whorls and measures: Height, 16.0 mm.; greater 

 diameter, 23.5 mm. ; lesser diameter, 18.1 mm. 



