189 



AN INDEX TO " A CLASSIFICATION OF THE AMERICAN 

 OPERCULATE LAND MOLLUSKS OF THE FAMILY 

 ANNULARIID^ ". By John B. Henderson and Paul Bartsch, 

 Proc. U.S. Nat. Mus., 1920, vol. Iviii, p. 49. 



Compiled by Hugh C. Fulton. 



Read 12th January, 1923. 

 This new family is separated from the Cyclostomatidae on 

 account of "a constant and essential radula difference", the" 

 sub-families are founded on " characters presented by the 

 operculum ", the new genera " upon minor modifications of the 

 opercular characters ", and the sub-genera " almost wholly upon 

 shell characters ". " The comparatively few species, the opercula 

 of which we have not actually seen, are excluded from con- 

 sideration." 



Arrangement of this index : — a synopsis is given first of the 

 sub-families, genera, etc., in the order in which they appear in 

 the above paper, the type species being placed in parentheses ; 

 this is followed by an alphabetical list of the species with numbers 

 referring to the genera to which they are attached by the above 

 authors. Many species that have formerly been erroneously 

 attributed by Pfeiffer and other authors to Grundlach, Arango, 

 etc., are in this paper accredited to their proper authorities. 



Fam. ANNULARIIDiE, Henderson & Bartsch, 1920. 

 Sub-family CHONDROPOMINM, H. & B., 1920. 

 Type Genus Chondropoma. 

 Genus Chondropoma, Pf., 1847. 



1. Sub-genus chondropoma, Pf., 1847. {semilabre, Pf.) 



2. „ chondropomatus, H. & B., 1920. {latum, Pf.) ' 



3. ,, CHONDROPOMiUM, H. & B., 1920. {weinlandi, Pf.) 



4. ,, CHONDROPOMETES, H. & B., 1920. {vignalensis , Pf.) 



5. ,, CHONDROPOMARTES, H. &B., 1920. {presasiana,Vi.) 



6. ,, CHONDROPOMORUS, H. & B., 1920. {dentatum, ^a,y) 



Genus Chondrothyra, H. & B., 1920. 



7. Sub-genus CHONDROTHYRA, H. & B., 1920. {egregium,'Poej.) 



8. ,, CHONDROTHYRiUM, H. & B., 1920. {violac^um, Pf.) 



9. ,, CHONDROTHYROMA, H. & B., 1920. {sagebieni, Pf.) 



10. ,5 CHONDROTHYRETES, H. & B., 1920. {shutttewoHhi , 



Pf.) 



Sub-family EHYTIBOPOMINM, H. & B., 1920. 

 Type Genus Rhytidopoma, Sykes. 

 10* Genus Rhytidothyra, H: & B., 1920. (bilahiatum, Orb.) 

 Genus Parachondria, Dall., 1905. 



11. Sub-genus parachondrisca, H. &B.,1920. {umbricola,'W einl.) 



12. ,, PARACHONDRELLA, H. & B^ 1920. {fecuuda, Ad.) 



13. ,, PARACHONDRIA, Dall, 1905. '{fascia, Wood.) 



14. „ PARACHONDROPS,H. &B.,1920. {camphelli, CB. Ad.) 



