THE 



QUARTERLY JOURNAL 



OP 



THE GEOLOGICAL SOCIETY OF LONDON. 



Vol. LXII. 



1. On a New Specimen of the Chtm^roid Fish, Myri acanthus 

 paradoxus, from the Lower Lias near Lyme Regis (Dorset). 

 By Arthur Smith Woodward, LL.D., F.R.S., F.L.S., F.G.S. 

 (Read November 22nd, 1905.) 



[Plate I.] 



In 1871 the late Sir Philip Egerton * communicated to the 

 Geological Society an account of part of a fossil Chimaeroid from 

 the Lower Lias of Lyme Regis, remarkable as exhibiting a peculiar 

 prolongation of the snout like that of the existing Callorhynchus. 

 He named the specimen Ischyodus orthorhinus. In the following 

 year he described 2 the somewhat anomalous dentition of a much 

 larger Chimseroid fish from the same formation and locality, and 

 regarded it as representing a previously-unknown genus and species, 

 Prognathodus Guentheri. With the aid of additional specimens in 

 1889, I was able to prove 3 that the dorsal fin-spine of the so-called 

 'Ischyodus orthorhinus ' was identical with an ichthyodorulite which 

 had been named Myriacanthus granidatus by Louis Agassiz in 1837 \; 

 while the dentition of the same fish, when satisfactorily preserved, 

 agreed generically with that known as Prognathodus. I therefore 



1 ' Ou a New Chiingeroid Fish from the Lias of Lyme Eegis {Ischyodus 

 orthorhinus) ' Quart. Journ. Greol. Soc. vol. xxvii (1871) pp. 275-78 & pi. xiii. 



2 ' On Prognathodus Guentheri, Egerton, a new Genus of Fossil Fish from 

 the Lias of Lyme Eegis' ibid. vol. xxviii (1872) pp. 233-36 & pi. viik 



3 ' On the Myriacanthidse — an Extinct Family of Chimaeroid Fishes ' Ann. 

 & Mag. Nat. Hist. ser. 6, vol. iv (1889) pp. 275-80 ; see also ' Catalogue of* the 

 Fossil Fishes in the British Museum' pt. ii (1891). 



4 ' Eecherches sur les Poissons fossiles' vol. iii (1837) p. 40 & pi. viii a, 

 fig. 16. 



Q.J.G.S. No. 245. b 



