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 bv 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 ( loc. 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. 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. 
[Is at. Hist. Is ew Tork, 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-vertebr® present. Scales 
[according to J. S. Newberry] having « the covered portion beauti- 
fully reticulated with large elongated meshes, the exposed portion 
