No. 2327. THE ANNVLARIIDAE— HENDERSON AND BART8CH. 77 



articulated. The riblets may or may not be gathered into tufts at 

 the summit, which may be appressed to the preceding whorl, or the 

 suture may be channeled. Operculum typically Tudoroid. 



Type of the subgenus — Oydostoma megacheilos Potiez and Michaud. 



The following species are now referred to this subgenus. They fall 

 into four gi-oups as follows: 



The group of Tudora rangelinum: 

 Cyclostoma rangelinum Poey Western Cuba. 



The group of Tudora ahhotti: 

 Tudora ( Tudora) ahhotti, new species Haiti. 



The group of Tudora TiahicM: 



Cyclostoma habichi Weinland Haiti. 



Cyclostoma reeveana Pf eiffer Haiti. 



Cyclostoma rollei Maltzan Haiti. 



Nerita labeo Miiller 'Jamaica "-Haiti. 



Cyclostoma kobelti Maltzan ,, .^.., . . ,,, Haiti. 



The group of Tudora megaclicila: ■ -: ,,.<;., 



Cyclostoma megacheila Potiez and Michaud ..!..'. Curacoa. 



Cyclostoma versicolor Pfeiffer Bonaire. 



TUDOROPS, new subgenus. 



Shell ranging in form from ovate-conic to elongate-conic. The 

 axial riblets, which are rendered articulate by the finer spiral threads, 

 may or may not be gathered into tufts at the summit. Operculum 

 typically Tudoroid. 



Type of the subgenus — Cyclostoma hanksianum. Sowerby. 



The following species are now referred to this subgenus. They fall 

 into three groups as follows: 



The group of Tudorops hanhsianum: 



Cyclostoma banisianum Sowerby Jamaica. 



Cyclostoma yallahensis C. B. Adams Jamaica. 



Cyclostoma redfieldianum C. B. Adams Jamaica. 



Cyclostoma redfieldanum concentrica C. B. Adams Jamaica. 



The group of Tudorops xanthostoma: 



Cyclostoma xanthostoma Sowerby Jamaica. 



Cyclostoma tenuistriata C. B. Adams Jamaica. 



The group of Tudorops undosum: .:,;ntvrv 



Ctenopoma undomm (Gundlach) Pfeiffer Western Cuba. 



Ctenopoma enode (Gundlach) Pfeiffer Eastern Cuba. 



Choanopoma troscheli Pfeiffer Western Cuba. 



Ctenopoma pulvendentum (Wright) Pfeiffer Western Cuba. 



Cyclostoma rotundatum Poey Western Cuba. 



Ctenopoma garridoianum (Gundlach) Pfeiffer Eastern Cuba. 



