E. T. NEWTON ON SAUEOCEPHALTTS. 795 



Geol. Surv. Terr. vol. ii. Cret. Vert. pp. 217, 275, pi. xlviii. f. 3-8 ; 

 1877, Bull. Geol. Surv. Terr. vol. iii. p. 821. 



Peotosphye^na peneteans, Cope. (America.) 



Erisichihe penetrans, Cope, 1877, Bull. Geol. Surv. Terr. vol. iii. 

 p. 821. 



Peotosphye^na ziphioldes, Cope. (America.) 



Erisichthe ziphioides, Cope, 1877, Bull. Geol. Surv. Terr. vol. iii. 

 p. 821. 



Cimolichthys levesiensis, Leidy. (England.) 



Saurodon Leanus, Agassiz, 1843, Poiss. Foss. vol. v. p. 102, pi. 

 xxv c . f. 30, 31 ; Dixon, 1850, Foss. Suss. p. 373, pi. xxx. £. 28, 29, 

 pi. xxxii*. f. 10. 



Cimolichthys levesiensis, Leidy, 1856, Trans. Am. Phil. Soc. I860, 

 vol. xi. p. 91. 



Cimolichthys maeginattjs?, Eeuss. (France and Bohemia.) 



Spinas marginatus, Reuss, 1845, Bohm. Kreide, p. 8, pi. iv. 

 figs. 10, 11. 



Anenchelum marginatus, Hebert, 1854, Mem. Soc. Geol. Fr. ser. 2, 

 vol. v. p. 350. 



Cimolichthys? steiatus, Agassiz. (England.) 



Saurocephalus striatus, Agassiz, 1843, Poiss. Foss. vol. v. p. 102, 

 pi. xxv c . f. 17-20. 



? Saurocephalus striatus, Dixon, 1850, Foss. Suss. p. 375, pi. 

 xxxv. f. 5. 



Protosphyrcena striatus, Leidy, 1856, Trans. Am. Phil. Soc. 1860, 

 vol. xi. p. 91. 



Note. — Since the above was written, a valuable paper by Mr. W. 

 Davies, of the British Museum, " On the Nomenclature of Saurocepha- 

 lus lanciformis, of the British Cretaceous Deposits ; with Description 

 of a New Species (#. Woodivardi)" has appeared in the ' Geological 

 Magazine ' (dec. 2, vol. v. p. 254) ; and it is most satisfactory to find 

 that, in so far as we treat of the same subject, we are in perfect 

 agreement, except as regards the name which should now be adopted 

 for the so-called Saurocephalus lanciformis. Mr. Davies is of opinion 

 that the name Protosphyrcena, proposed by Prof. Leidy, should not 

 be adopted, inasmuch as it seems to indicate an affinity with Sphy- 

 rcena, which does not exist, and he therefore would use Prof. Cope's 

 name of Erisichihe. Although quite appreciating the cogency of my 

 friend's reasoning, I could not but feel that this was a case in which 

 the law of priority must be respected. Unwilling, however, to trust 

 to my own judgment alone, I laid the matter, as clearly and fully as 



