16 
{=Ischypterus) ^ as the forerunners of the Lephlosteoidci, in which there is 
no infraclavicle, and in which the rays of the median fins correspond in 
number with their supporting ossicles. It is nnfortunate, indeed, that the 
state of preservation of the known specimens docs not permit of these 
characters in the osteology being clearly ascertained; hut a study of the new 
fossils from the Ilawkeshury beds, in the light of examples already described 
from the European and American Trias, is so suggestive of intimate relation- 
shi]) Avitli the Palieoniscidtc, that we venture to suggest an emendation of the 
now-accepted arrangement of these fishes. 
If Mr, Einkel’s draAvings of Diclyopyge macrura* be correct, the 
number of the fin-rays in the anal fin is distinctly greater than that of the 
supporting interspinous bones ; and the fish is therefore excluded, by 
accepted definitions, from the “ Ecpidosteoidei,” and falls Avith the Palaeon- 
iscidae into the “ Acipenscroidei ” (Traquair), or “ Ileterocerci ” (Zittel). 
One of the Australian fossils (D. illustmns, PL IV., Pig. 7) exhibits a 
large triangular bone beneath the back of the mandible, which seems 
most satisfactorily compared with the Palaeoniscid infraclavicle ; and tlie 
A'aguely discernible features of the head also bear a very striking resem- 
blance to the corresponding parts in the Pala3oniscidae, Moreover, the 
tail in the new specimens (PI. IV., Pig. 9) is slightly more hcteroccrcal 
than has hitherto been observed in this genus. 
It is therefore proposed to place Catoptenis and Diclyopyge in a 
distinct family, the Catoptcrid^e to be assigned to Avhatevcr great sub- 
division of the “Ganoids” is made to include the Paheoniscidae and their 
allies. 
EICTYOPYGE, Egerton, 1817. 
((^iiai'fc. Journ. Gcol. Soc., vol. iii., p. 27G). 
Gcu. Char. — Head small, or of moderate size ; gape very Avide ; 
teeth minute and conical. Pins Avith distinct fulcra ; dorsal opposite 
to, or immediately in ad\"ance of the anal ; caudal fin forked. Scales 
rhombic, as deep as broad upon the Hank, broader than deep A^entrally, 
the exposed surface smooth, or Avith fcAV oblique ridges or furroAvs. 
Ptidge-scales absent. 
Ohs . — As remarked by Traquair, t Diclyopyge is only distinguished 
from Caloplerus, so far as kuoAvn, by the position of the dorsal fin ; 
* Quart. Journ. Gcol. Soc., A'ol. iii., PL viii., PL ix., fig. 1. 
t R. K. Tniquiiir, “On I lie Agiissizian Genera .imhhipferw^, Palceoniscus, Gi/rolepfs, and Pppopierus," 
Quart. Journ. GeoL Soc., 1877, A’’ol. xxxiii, jn 507. 
