A treatise on zoology . (.(WA-oiUws dcclpiens, Ag. Ventral shield,restored. (After JYaqnair, from A. S. Wood-ward.) , anterior median ventral; , an-terior ventro-lateral; i.!, inter-lateral (clavicle?);1, median ventral ; , posterior ventro-lateral. Dotted lines indicate the course oflateral-line -a/i<^. Fia. 230. Lower jaw of PhnUdosleun Frieddi, .Jkl. A, outer view ; B, inner view (after Jaekel).aiiQ, angular ; tirt, articular; spl, splenial. Fhhjdaenasjm, mentioned above, may conceivably represent thepectoral limbs of Pterichthys. Such resemblances may, howeve
A treatise on zoology . (.(WA-oiUws dcclpiens, Ag. Ventral shield,restored. (After JYaqnair, from A. S. Wood-ward.) , anterior median ventral; , an-terior ventro-lateral; i.!, inter-lateral (clavicle?);1, median ventral ; , posterior ventro-lateral. Dotted lines indicate the course oflateral-line -a/i<^. Fia. 230. Lower jaw of PhnUdosleun Frieddi, .Jkl. A, outer view ; B, inner view (after Jaekel).aiiQ, angular ; tirt, articular; spl, splenial. Fhhjdaenasjm, mentioned above, may conceivably represent thepectoral limbs of Pterichthys. Such resemblances may, however,very well be due to convergence, and so do not outweigh the 262 COCCOSTEOMORPHI many important differences. The real affinities of the Coccosteo-morphi are still obscure. The Suh-Class may be divided into two Orders—the Anarthro-dira (Dean [109]) and the Arthrodira. Order 1. ANARTHRODIRA. A small group of incompletely known fish, perhaps representinga less specialised type than the Arthrodira. Large sculpturedplates extend dorsally from the cranial shield over the appears to be no differentiated joint between the armour ofthe two regions, the limit being marked only by an internal shelf ofbone. But perhaps the whole shield belonged to the skull, and therewas no trunk-armour (Eastman [129]). The later
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
