PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued i^^lVyl QSi^il h the 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



Vol.89 Wa.hington:194I No. 3096 



THE CUBAN OPERCULATE LAND MOLLUSKS OF THE 

 FAMILY ANNULARIIDAE, EXCLUSIVE OF THE SUB- 

 FAMILY CHONDROPOMINAE 



By Carlos de la Torre and Paul Bartsch 



In the introduction to our monogi'aph on "The Cuban Operculate 

 Land Shells of the Subfamily Chondropominae" ^ we gave a general 

 historic account of the work preceding our effort. The statements 

 made there apply equally to the present paper. We are considering 

 here the remaining subfamilies of the family Annulariidae known to 

 inhabit Cuba, namely, the Rhytidopominae, Adamsiellinae, and 

 Annulariinae. 



The differentiations which the members of this family have under- 

 gone in Cuba are extraordinary and offer a field for speculation and 

 theorizing unequaled in any other part of the world. We are con- 

 fining our attention to the taxonomic side of the question, merely 

 calling attention to demonstrable facts without expressing personal 

 opinions regarding the speculative questions involved. 



Following Henderson and Bartsch,^ we are recognizing four sub- 

 families in Annulariidae, basing our divisions upon opercular char- 

 acters. 



All annularids have an operculum, consisting of a chondroid basal 

 plate of a varying number of whorls. The whorls composing this 

 plate may be simple, that is, without further differentiation, or they 

 may have a granular calcareous deposit, or bear ribs or lamellae or 



> Proc. U. S. Nat. Mus., vol. 85, pp. 193-403, figs. 71-101, pis. 7-39, 1938. 

 « Proc. U. S. Nat. Mus., vol. 68, pp. 49-82, 1920. 



131 



