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blunt snout. More fragmentary examples of the same species are 
also associated with it. This form seems to have been first known 
merely by the mandible, which was discovered in the Upper Lias. 
of Baden and described under the name of Saurostomus esocinus, 
by Agassiz (1833-44). Fragments from Whitby received the 
MS. name of Pachycormus latirostris, Agassiz (1844). An im- 
perfect skeleton from Wiirtemberg was at the same time named 
Eugnathus gigas or Pachycormus gigas by Agassiz, though again 
without description. A still finer skeleton from the same locality 
was briefly described and named Pachycormus bollensis by Quenstedt. 
in 1858. Another skeleton probably of the same species from 
Wiirtemberg, was acquired by the Teyler Museum, Haarlem, and 
described as Pachycormus westermani by T. C. Winkler in 1878. 
Finally, a similar skull from the Upper Lias of Yonne, France, 
received the name of Catwrus gigas from Sauvage in 1891. The 
species is thus well supplied with names, defined and undefined ; 
but according to the ordinary laws of nomenclature, it must be 
termed either Saurostomus esocinus or Pachycormus esocinus, the 
specific name just mentioned being the earliest. 
The unique specimen in the Moore Collection proves that the 
fish belongs to the Pachycormide as now understood; but one 
conspicuous feature suggests doubts as to the correctness of 
referring the species to the genus Pachycormus itself. It will be 
noticed that the roof of the skull is quite flat, not raised into a 
median ridge at the back, while its constituent bones are less. 
completely fused together than in the typical Pachycormus. The 
same peculiarities may be very distinctly seen in the skull from 
q Whitby. The scales also have a singularly curly appearance in 
the fossil ; and the “lateral line” on the tail is supported by a 
row of somewhat enlarged scales, such as have never been 
observed in any undoubted species of Pachycormus, 
PHOLIDOPHORUS. 
No other genus is represented in the Moore Collection from 
Ilminster, but it may be added that there is one specimen of the 
Q 
