. Bulletins of American paleontology. ginal length is unknown. In 1978, I found a dead Fasciolaria shell six inches( cm) high covered with Crepiilula. The shells onthe upper whorls near the apex of the shell were nar-row and strongly convex, as in Text-figures 59B andC. Shells on the body whorl were broad and low. asin Text-figure 59A. Inside the aperture, where the cur-vature was reversed, all of the Crepidula were con-cave, as in Text-figure 59E. Text-figures 59F and G are of two shells distortedby their substrata. The shell in Text-figure 59F wasattached to a heavily ribbed shell (possi
. Bulletins of American paleontology. ginal length is unknown. In 1978, I found a dead Fasciolaria shell six inches( cm) high covered with Crepiilula. The shells onthe upper whorls near the apex of the shell were nar-row and strongly convex, as in Text-figures 59B andC. Shells on the body whorl were broad and low. asin Text-figure 59A. Inside the aperture, where the cur-vature was reversed, all of the Crepidula were con-cave, as in Text-figure 59E. Text-figures 59F and G are of two shells distortedby their substrata. The shell in Text-figure 59F wasattached to a heavily ribbed shell (possibly an oyster)which deflected the margin. The shell in Text-figure59G was apparently distorted by growing attached toa surface that was not straight. The varying shapes recognizable among these shellshas led to the designation of various species: • C. Say, 1822, has been used for narrow,strongly convex shells (Text-fig. 59B, F, G) • C. fornicata covers broader convex shells that attach MoLLUSK Shells in Florida Bay: Shaw. Text-liiiure 59.—Gastropods with cup-shaped shells with an internal shelf. A-G. Ciepulula foiiucata. H. CrepidiiUi iiciilc themselves to wider surfaces than does C. convexa(Text-fig. 59A). • C. glauca Say, 1822, includes broad shells of lowconvexity with white, unmarked outer surfaces. • C. maculosa Conrad, 1846, has the same broad lowshape of C. glauca, but it bears rows of reddish orbrown spots (Text-fig. 59A). • C. plana Say, 1822, was proposed for virtually flatshells but has also been used for the concave shapeillustrated in Text-figures 59D and E. All of these species are here included in foriii-cata. I have not simply grouped them all under thegeneric nomen Crepidula spp. because C. aculeata(Gmelin, 1791), an easily separable Crepidula withrows of cuplike spines on the shell, would also haveto be included in Crepidula spp., but we recognized itas the distinct Amoco Taxon # 2004. Comparison.—No other shell contains the flat um-bona
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