Occasio)ial Papers of the Museum of Zoology 33 



D. Shell more depressed ; sutures distinct!}- impressed ; 

 whorls convex. Coloras Island, Gulf of Paria, Trin- 

 idad. 16.8; 136(22.9) 



Cyclostoma triuitciisis Guppy (1864). 



DD. Shell medium ; sutures less distinct ; whorls less round- 

 ed. Colombia. 16; 127(20.4); 5 



Cyclostovia tnvtsluciditvi Sowerby (1843). 



DDD. Shell more elevated ; heavier. 



E. Smaller. Bejuma. Venezuela. 14.9; 117(1".=;") 4^/2. 

 ....(!) P. transliicida bcjtuiiciisis. new subspecies. 



EE. Larger. Caracas. Venezuela. 21.3; 116(26.3); 41^. 

 ( !) P. transhicida, var. major, Bland MSS. 



CC. Growth lines prominent, usually undulate: shell heavier; 

 adults darker in color. 



F. Growth lines with epidermal ridgelets, usually simply 

 undulate ; color of adults pronounced. 



G. Color of adults dark olive green ; lower lip with 

 slight emargination. La Fria, Venezuela. 17.8; 128 



{22.7); 4V2 



..(!) P. transhicida santaguitcnsis, new subspecies. 



GG. Color of adults dark reddish ; lower lip quite entire. 



'El Libano, 6500 ft., Santa IMarta Mts., Col. (L 11, 



74). 14.5; 135(19-5); 4 (!) Aper- 



ostoiua sinithi Pils. and Clapp (1902) Nautilus. 

 FF. Growth lines usually anastamosing, so as to approach 



the next group (P. straminca) in sculpture 



Poteria dysoiii (Pfr.) 



H. Peristome double, solute. Mirador, Mexico. 16; 



140(22.5); 5 Cydotus berendti Pfr. (1861). 



HH. Peristome simple, but often slightly solute. 



L Later whorls with spiral stripes of lighter color. 

 Cave at Tabi, Yucatan. . . ( !) C. dysoni (form) 

 multilincatus Pils. (1891). Proc. Acad. Nat. 

 Sci., Philadelphia. 



IL Unicolor. 



J. Smaller. Tabi, Yucatan. Maj. diam. 16 mm. 

 (!) Cydotus dysoni, var. minor Mart. (1890)." 



•i Biol. C. A.; plate i. This is apparently a description and not a 

 name. 



