198 American Seashells 



Subgenus Tutufa Jousseaume 1881 

 Bursa tenuisculpta Dautz. and Fischer Fine-sculptured Frog-shell 



Southeast Florida and the West Indies. 



2 to 3 inches in length; with 5 to 7 spiral rows of numerous, evenly 

 sized beads. Old varices spaced % of a whorl apart so that the varices do 

 not line up under each other. Color dull ash-gray. Dredged on rare oc- 

 casions. 



Subgenus Colubrellina Fischer 1884 



Bursa corrugata Perry Gaudy Frog-shell 



Plate 9k 



Southeast Florida and the Caribbean. Lower California to Ecuador. 



2 to 3 inches in length; flattened laterally; with 2 prominent, knobbed 

 varices on each whorl. Just in front of each varix there is a sharp frill. There 

 are generally i or 2 rows of blunt nodules on the whorls. This is a rare species 

 in the Atlantic, but more frequently encountered on the west coast of Cen- 

 tral America. Alias caelata Broderip, ponder osa Reeve and louisa M. Smith. 



Bursa gra?2ularis Roding Granular Frog-shell 



Plate 25-0 



Southeast Florida and the West Indies. 



% to 2 inches in length, flattened laterally. Varices axially placed one 

 below the other. Color orange-brown with 3 narrow, white bands which 

 appear as prominent white squares on the varices. Spiral sculpture of several 

 rows of small beads, those on the periphery of the whorl having the largest 

 beads. Teeth in aperture white. Uncommon. Alias cubajiiana Orbigny and 

 affinis Broderip. 



Subgenus Bujonaria Schumacher 18 17 

 Bursa spadicea Montfort Chestnut Frog-shell 



Plate 2 5P 



Southeast Florida and the Caribbean. 



I to 2 inches in length, flattened laterally; with strong, rounded varices, 

 2 on each whorl and lined up axially one under the other. Surface covered 

 with spiral rows of numerous, small beads. Posterior siphon has one wall 

 next to the body whorl. Color yellowish with diff^used markings of orange- 

 brown. Rare. Dredged off Florida in moderately deep water. Alias B. crassa 

 Dillwyn. 



