68 University of 3Iichigan 



Tudora fossor arubana, new subspecies 

 Type locality: (A2b) spur of Seroe Pretoe, between Roois 

 Spoki and Hundoe, southern Aruba. 



Distribution: Aruba; limestone deposits southeast of 

 Spaansch Lagoen (Al, 2). Quite common; mainly under 

 limestone rocks, but also on trunks and the larger brandies 

 of trees in well-wooded places (A2) ; more nearly arboreal 

 than the other subspecies. 490 specimens collected. 



Shell (fig. xiii-K) : averages the largest in the species, but 

 scarcely as heavy as djerimensis. Ground color : cream to 

 salmon and orange, the reddish tints predominate ; spiral 

 bands present or absent, continuous or broken, often with 

 blotches joined to form varices; eroded apex and apical plug 

 buff to (usually) deep indigo. Sculpture of last whorl (fig. 

 x-38) : prominent to almost confluent, closely-spaced to con- 

 tiguous, regular growth-threads, which are more rounded 



