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146
American Seashells
with a septum. As additional growth takes place, the animal retreats gradually
from the apical or rear portion and forms new, internal septa. The
operculum is thin, circular, homy, and multispiral.
Figure 37. American Caecums. ATLANTIC: a, Caecum florida?m?n Stimpson;
b, C. cooperi S. Smith; e, C. carolinianum Dall; d, C. piilchellwn Stimpson; e,
C. nitidum Stimpson; f, C. nebulosum Rehder (type). PACIFIC: g, C. californicum
Dall; h, C. dalli Bartsch (type); 1, C. carpenteri Bartsch (type); j, C. occidentale
Bartsch (type); k, C. heptago?nmi Cpr.; I, C. orciitti Dall (type); m, C. crehricbictinn
Cpr. All Xio.
Caecum floridanum Stimpson
Genus Caecum Fleming 18 17
Subgenus Caecum s. str.
North Carolina to Southern Florida.
Florida Caecum
Figure 37a
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