. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. QiiQ On the Anatomy &c. of the Order Discocepliali. only at the anterior end of the latter^ capable of a certain amount o£ independent movement. Palatine elongate, attached by its upper edge to the lateral ethmoid ; pterygoid and mesopterygoid ankylosed ; suspensorium, branchial, and opercular bones otherwise typically Percoid. Skull broad, very strongly depressed, with flat or concave upper surface; basisphenoid and alisphenoids absent; exoccipital condyles transversely e
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. QiiQ On the Anatomy &c. of the Order Discocepliali. only at the anterior end of the latter^ capable of a certain amount o£ independent movement. Palatine elongate, attached by its upper edge to the lateral ethmoid ; pterygoid and mesopterygoid ankylosed ; suspensorium, branchial, and opercular bones otherwise typically Percoid. Skull broad, very strongly depressed, with flat or concave upper surface; basisphenoid and alisphenoids absent; exoccipital condyles transversely expanded, wide apart; nasal and praeorbital firmly united to each other and to the lateral ethmoid; number and arrangement of other bones of skull as in the Fiff. p soc ioc "epo yU:-'' opb eoc ^ -(roc pro Hemora clypeata. Skull from cabove (A) and below (B). V, vomer; eth, mesethmoid ; leth, lateral ethmoid ; pror, praeorbital; n, nasal; f, frontal; ;;, parietal; soc, supraoccipital ; ex, exocci- pital ; boc, basioccipital; epo, epiotic ; opo, opistbotic ; pto, pterotic ; spo, spbenotic ; pro, prootic ; psp, paraspbenoid ; pit, post-temporal. Perciformes. Vertebrse 23 to 30 ; ribs and epipleurals inserted together on strong transverse processes. Pectoral arch of the Perciform type, except that the supracleithrum is reduced and 3 radials are in contact with the hypocora- coid ; pelvic bones directly attached to the cleithra. Two families may be recognized :— Family 1. Opisthomyzonidae. Disc of about 6 segments, small, narrow, not extending forward to the interorbital region, its width about ^ the width of head. Vertebrte 23 or 24. Dorsal fin longer than anal ; caudal widely forked. Opisthomyzon glaronensis from the Upper Eocene of Switzerland (Wettstein, Mem. schweiz. Palseont. Ges. xiii. ]886, p. 82, pi. vii. fig. 10 ; Storms, Ann. & Mag. N. PI. (6) ii. 1888, p. 73 ; Cope, Amer. Nat. xxiii. 1889, p. 355).. Please note that these images are extracted from scanned
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