438 CLASSIFICATION OF DEVONIAN FISHES 
into two equal lobes by the unossified spinal column ; the latter 
extending beyond the caudal fin as a tufted appendage, or second 
caudal, provided with very short fin rays. There is a single anal 
fin; the pectoral and ventral fins are well developed and obtusely 
lobate ; the pelvic bones are remarkably large, and are united 
together by transverse branches, which extend from the posterior 
extremities of each and meet in the middle line; there are no dorsal 
ribs and no proper branchiostegal rays, but instead of them, two 
broad principal jugular plates. Finally, the scales, large, thin, 
and cycloid, are ornamented with elongated splashes and dots of 
enamel. On the other hand, “ Celacanthus” MiinsterZ exhibits no 
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1 
Fig. 11. Restoration of Undzna. (Partly after Munster, partly from Lord Enniskillen’s 
specimen. Below the head are the contours of the jugular plates. ) 
one of the positive characters here enumerated, while it Aas ribs 
attached throughout the dorsal region; in fact, I am inclined to 
consider it the type of a new genus allied to Phaneropleuron. 
I have seen no specimens of the other species of Calacanthits 
enumerated by Agassiz, and I can therefore say nothing about 
them. But Caelacanthus caudalis (Egerton) is a true Ccelacanth, 
as I have convinced myself by examination of the specimen, to 
which the figure in King’s “ Permian Fossils” does not quite do 
justice. 
As the case stands, then, it appears that there is no evidence that 
the supposed distinction between Celacanthus and Undina really 
obtains; while, on the other hand, a recent careful comparison of 
