﻿364 CKOSSOPTERYGII. 



Type. Anterior portion of skull ; University of St. Petersburg. 



A species attaining a larger size than the type, and having the 

 teeth almost or quite erect to the apex. Snout gently rounded and 

 head-bones externally ornamented with coarse granulations, which 

 are rarely fused together into short vermiculating series. 



As remarked by R. H. Traquair (Geol. Mag. [3] vol. vi. 1889, 

 p. 491), the specimens described under this name by Rohon as 

 entire skulls are merely fragmentary examples of the region in 

 advance of the parietal bones. The pair of large teeth shown in 

 these fossils is borne by the vomers, and the supposed orbits are 

 probably the nasal openings. 



The tuberculated scales described and figured by Rohon (Jog. cit. 

 p. 6, pi. i. figs. 7, 8, pi. ii. figs. 13, 15, 16, 17, 18, 20) may pos- 

 sibly pertain to this species, but Trautschold remarks (loc. cit. 1890, 

 p. 622) that such scales have not yet been found in the same 

 localities as the jaws. The specimens are preserved in the School 

 of Mines, St. Petersburg, and the University of Dorpat. 



Form. Sf Loc. Devonian : Government of St. Petersburg, and 

 (?) Livonia. 



28871. Base of large mandibular tooth affixed to part of the sup- 

 porting bone ; locality unknown. Purchased, 1854. 



P. 4733. Two similar specimens, one of them showing the outer 

 series of small teeth, and also a detached tooth wanting 

 the apex ; River Ssjass. Purchased, 1884. 



To this, or to the following genus, may also probably be assigned 

 the species described thus : — 



Cricodus (?) agassizi, M. Lohest, Ann. Soc. Geol. Belg. vol. xv. 

 (1888), p. 120, pi. vii. fig. 4, pi. viii. fig. 1.— Upper 

 Devonian ; Belgium. [Imperfect dentary and teeth ; 

 M. Lohest Collection, Liege.] 



Genus SAURIPTERUS, Hall. 



[Nat. Hist. New York, pt. iv. Geology, 1843, p. 282 (Sauripteris).~\ 



Head-bones, operculum, jugular plates, and clavicular bones or- 

 namented with tubercles, more or less fused into short, vermicu- 

 lating ridges. Teeth compressed to the base with a pair of sharp 

 edges ; pulp-cavity large. Ossified ring-vertebrae present. Scales 

 [according to J. S. Newberry] having " the covered portion beauti- 

 fully reticulated with large elongated meshes, the exposed portion 



