. Bulletins of American paleontology. Dominant or Key Taxa. The caecids can be quicklydivided into two groups: (A) those with surface or-nament, and (B) those with smooth shells. The orna-mented shells are separable into a group bearing onlyannular rings and a more complex group bearing prin-cipally longitudinal ornainent. with or without annularrings. None of the longitudinal group is commonenough to be of significance in biofacies separation. Comparison.—There are two other taxa with dom-inant annular ornament: Caecum 2168 (Text-fig. 57C)has a heavier shell, is longer, and bears three or fou

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. Bulletins of American paleontology. Dominant or Key Taxa. The caecids can be quicklydivided into two groups: (A) those with surface or-nament, and (B) those with smooth shells. The orna-mented shells are separable into a group bearing onlyannular rings and a more complex group bearing prin-cipally longitudinal ornainent. with or without annularrings. None of the longitudinal group is commonenough to be of significance in biofacies separation. Comparison.—There are two other taxa with dom-inant annular ornament: Caecum 2168 (Text-fig. 57C)has a heavier shell, is longer, and bears three or fourheavy apertural rings. Caecum 3279 (Text-fig. 57D)lacks apertural rings and has many more, finer annularrings than C. pulchellum. Name.—Caecum pulchellum Stimpson. 1851. Biofacies.—Found in all biofacies except RockyShore. A Key Taxon in the Grecian Rocks in the Reef Tract. Tricolia and both CentralBiofacies. Common in the Lucina and Gulf generally elsewhere but uncommon near theEverelades. 4^.

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