STEWART: NOTES ON SAURODON AND ALLIED S PECIES. 183 
‘ing the sword-fishes’ sword and was no doubt used as a weapon of 
offense. In an animal with such a we pon as this, we might expect 
to find powerful fins, but this is not the case with this species. In 
other respects the skull does not materially differ, excepting in 
details, from the skull of other members of the Saurodontida. 
Saurodon ferox sp. nov. 
This species is represented by the jaws, including the predentary, 
and other disarticulated bones and vertebre. 
The maxillary is larger than the one just described. The poste- 
rior condyles above are somewhat elliptical in outline and but 
slightly convex from before backwards. Just anterior to this there 
is a large protuberance which may support a condyle above, and 
on the external side of this there is a small facet which probably 
gives articulation with the ethmoid. The surface for the premax- 
illary is very irregular and is directed inward, becoming thinner 
toward the anterior border which is sharp. The superior border 
is strongly concave and sharp, and presents a sutural surface on 
the external side probably for a supernumerary bone or jugal. 
The alveolar border is convex and has alveoli for forty or forty- 
one teeth which are non-striate and knife-like. Each tooth has the 
characteristic notch at the base. The posterior extremity of the 
bone is very shallow and turned slightly upward. Aside from the 
shagreened surface of the bone above the alveolar border the 
external surface has no characteristic markings. 
The premaxmillary is very similar to that of the species de- 
scribed above, except that there are ten instead of twelve teeth. 
On the internal side the bone 1s bevelled off toward the posterior 
border in order to fit the surface for its reception on the maxillary. 
MEASUREMENTS OF MAXILLARY AND PREMAXILLARY. 
Maxillary len xthsotranyeOlambord Gieie.). vie. ai cae sit ahs hitem caer ase aes 115 
a depthbat-condplestcempa tyne: vnrisieete statics eeicae en seeaghe.s selon a 45 
SECALeS tema tHE OlMDONER + sc. neve bes elu id. Fanti tas . 128 
MiMibeR OteT Sects Gary sii «ocd: ours ay. eaten npn 3.5 
I PATTesnie STUN EW AIA. TOKENO) U Uipad  ses e hs Pye end RCS PLR COLA REA aR i CREE a oy ee ae 60 
: VEST SIR RR ea ene Yee RIE ne cm as oe SS te aks ye NE co ae 32 
The dentary is elongate and slender. The alveolar border is 
slightly incurved at the sympyhsis and supports forty-six teeth, 
similar in form but about twice as large as those upon the maxilla. 
Just back of the last tooth there is a slight coronoid process, 
somewhat similar to that found in Avphactinus. The symphysis is 
very similar to that found in the last species described, and has 
