Fishes . ch is composed ofmany slender rays. Suborder Zeoidea. — Not far from the Selenichthyes andthe Berycoidei we may place the singular group of JohnDories, or zeoid fishes. These have the ventral fins thoracicand many-rayed, the dorsal fin provided with spines, and thepost-temporal, as in the Chwtodontidce, fused with the Boulenger calls attention to the close relation of thesefishes to the flounders, and suggests the possible derivation ofboth from a synthetic tj^^e, the Amphistiidce, found in theEuropean Eocene. The Amphistiidce, Zeidce, and floundersare united by him to form
Fishes . ch is composed ofmany slender rays. Suborder Zeoidea. — Not far from the Selenichthyes andthe Berycoidei we may place the singular group of JohnDories, or zeoid fishes. These have the ventral fins thoracicand many-rayed, the dorsal fin provided with spines, and thepost-temporal, as in the Chwtodontidce, fused with the Boulenger calls attention to the close relation of thesefishes to the flounders, and suggests the possible derivation ofboth from a synthetic tj^^e, the Amphistiidce, found in theEuropean Eocene. The Amphistiidce, Zeidce, and floundersare united by him to form the group or suborder Zeorhoiubi,characterized by the thoracic ventrals, which have the raysnot I, 5 in number, by the progressive degeneration of the fin-spines and the progressive twisting of the cranium, bringingthe two eyes to the same side of the head. It is not certainthat the flotmders are really derived from Zeus-like fishes, butno other guess as to their origin has more elements of Fig. 364.—Semiophorus velifer Volta. Eocene. (After Agassiz, per Zittel.) 461 462 Salmopercas and Other Transitional Groups We may, however, regard the Zeoidea on the one hand andthe Heterosoinata on the other as distinct suborders. This is
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