374 CRETACEOUS FISHES. 
This fish must have had considerable resemblance to the Sphyrzna or Baracuda 
Pike in the sharpness of its physiognomy, the length of the lower jaw, and the 
predatory character of its teeth. The barbed teeth described by M. Agassiz are 
those on the palatine bone, their edges are finely serrated ; the teeth in the lower 
jaw are of an entirely different form, the base is broad and fluted, the blade 
compressed and recurved, with a sharp, finely-serrated edge ; they are separated 
from each other by wide intervals, which are filled by innumerable, small, pointed 
teeth. It is from Malling pit near Lewes. I have several single, barbed teeth ; all 
the specimens are from the upper chalk. I have found this tooth at Charlton 
near Woolwich, and at Gravesend. 
Genus Pachyrhizodus', new, Agassiz. 
Pachyrhizodus basalis, R. 4. (Tab. XXXIV. figs. 12 & 13.) 
The fine and remarkably strong lower jaw of this fish, named by M. Agassiz, 
was found at Steyning. I have added the specific name of basalis, from the 
large size of the base of the tooth. The apex of the tooth is very brittle, slightly 
curved inwardly and solid; the base is hollow, and extends into the substance 
of the jaw. In Sir P. Egerton’s cabinet there is a specimen of this fish, showing 
the humerus which is unusually thick and strong ; it also shows the scales, which 
are large and circular, and covered with asperites so minute as to be indistin- 
guishable without the aid of a glass. 
Family SpHyranipZ. 
Genus Saurocephalus?, Agassiz. 
ip > 
The teeth of this genus were first discovered in the chalk of America, and con- 
sidered by R. Harlan to have belonged to reptiles. M. Agassiz placed them 
among the fishes of the family Sphyrznidz, which has been proved to be correct 
by Professor Owen’s microscopical investigations. 
Saurocephalus lanciformis, R. (Tab. XXXIV. fig. 14; Tab. XXX. fig. 21; 
Tab. XXXI. fig.12. Vol. v. p. 102, Agassiz.) 
The finest specimen of this species hitherto discovered belongs to Mr. Bower- 
bank ; it shows the extremities of the two rami of the lower jaw; the dentary 
' raxus crassus, pila radix, ddovs dens. * aavpos lacerta, xepads caput. 
