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270 American Seashells
1 5 short axial ribs per whorl. Spiral threads numerous and fine. Sinus small,
its posterior end round, its opening narrow. Not uncommon below low
water under rocks.
C. sanibelensis Bartsch and Rehder is similar, but i inch in length, with
9 longer and wider axial ribs, with a large slit, and colored orange-chestnut
with white between the ribs. Uncommon around Sanibel Island.
Subgenus Crassispirella Bartsch and Rehder 1939
Crassispira ostrearum Stearns Oyster Turret
North Carolina to south half of Florida. Cuba.
Plate 26n
% to % inch in length; light yellow-brown to chestnut. Sinus U-shaped.
About 20 weakly beaded axial ribs per whorl. Just below the suture there
is a single, smooth, strong spiral cord. Spiral threads moderately strong to
weak (16 to 20 on the last whorl, 4 between sutures). Lower part of outer
lip thin and strongly crenulate or wavy. Common from low water to 90
fathoms. C. tampaensis Bartsch and Rehder is very similar, and may be this
species.
Genus Cerodrillia Bartsch and Rehder 1939
Cerodrillia perry ae Bartsch and Rehder Perry's Drillia
West coast of Florida.
/4 inch in length, flesh-colored, with a broad, golden-brown band
around the periphery. 8 to 9 axial ribs per whorl. Faint spiral lines present.
Not uncommon. C. tbea has shorter axial ribs and is uniform chocolatebrown.
Cerodrillia thea Dall Thea DriUia
West coast of Florida.
Figure 57f
!4 inch in length, thick-shelled, with a glossy-brown finish, and with
the short, slanting ribs cream in color. Outer lip prominent. Sinus deep
and U-shaped. Uncommon in shallow water.
Genus Monilispira Bartsch and Rehder 1939
Momlispira albinodata Reeve White-banded Drillia
Southeast Florida and the West Indies.
V2 inch in length, resembling a Cerithimn in shape; color dark blackish