XXV 
PHANEROPLEURON ANDERSONI 
Memoirs of the Geological Survey of the United Kingdom. Figures and 
Descriptions illustrative of British Organic Remains., 1861, Decade X., 
LP. 47-49. 
PLATE III. [PLATE 35]. 
[Genus PHANEROPLEURON. Hux ey. (Sub-kingdom Vertebrata. Class Pisces. 
Order Ganoidei. Sub-order Crossopterygidze. Family Phaneropleurini.) Body elongated, 
tapering to an acute point posteriorly, compressed from side to side. Dorsal fin single, 
extending for nearly the length of the posterior half of the body; the paired fins acutely 
lobate ; the ventrals very long, apparently longer than the pectorals, and situated beneath 
the anterior end of the dorsal fin. Tail inzequilobate, the upper lobe being by far the smaller. 
Scales cycloid, very thin. Teeth numerous and conical. Neural arches, ribs, and inter- 
spinous bones well ossified. ] 
Phaneropleuron Andersont. Sp. UNICA. 
ALL the specimens of this species and genus at present known have 
been procured from the Old Red Sandstone at Dura Den, associated 
with Holopiychius, the two genera being constantly found associated 
in the same slabs of sandstone. A fine series of examples is to be 
seen in the British Museum and the Museum of Practical Geology, the 
whole of which, I believe, were collected by Dr. Anderson, in whose 
work upon Dura Den the first description of the present species 
appeared. The fish had received the name of Glypticus from Agassiz 
long before, but the name was unaccompanied by any description 
or definition, and has been used for a genus of Echinodermata. 
The most complete specimen I have seen is that figured (two- 
thirds of the natural size) in Plate III. [Plate 35] fig. 1, which 
occurs among a number of other examples of this genus and of 
Floloptychius,in a fine slab marked 26120 in the collection of the 
British Museum. 
HH 2 
