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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, ponderosa Reeve and louisa M. Smith.
Bursa gra?2ularis Roding Granular Frog-shell
Southeast Florida and the West Indies.
Plate 25-0
% 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
Southeast Florida and the Caribbean.
Plate 2 5P
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.