- Opisthosoma without trace of separate terga and sterna, the segmentation merely represented posteriorly by slight integumental folds and the sterna of the 1st and 2nd somites by the opercular plates of the pulmonary sacs. [Please select]
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The movements, however, of the four opercular valves are not at all more independent of the other valves, than in the other Pedunculated Cirripedes; and the peduncle is furnished with all its characteristic muscles. [Please select]
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The squamosal of _Acanthostega_ (Jarvik, 1952) is articulated under the tabular and reaches forward and down, much as if it were an opercular in reversed position. [Please select]
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Apparently none of the opercular series was present. [Please select]
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In the argument thus far we have considered terrestrial, adult amphibians, since it is only in these that either the normal middle ear and tympanum, or the opercular apparatus, is present. [Please select]
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