CRETACEOUS FISHES. 367 
and differing in shape by being much less oblique and attenuated ; the notch on 
the posterior margin is smaller, and the accessory denticle not so prominent. 
The serrations surrounding the margin of the tooth are remarkable for their 
neatness and regularity ; they are smaller in proportion to the size of the tooth, 
than in any other species of the genus. I have observed it in the cabinets of 
the Rev. T. Image and Mr. Fitch, from Norfolk and Suffolk; also in Captain 
Burgh’s collection from Sussex. The figured specimen was procured at 
Houghton. 
Genus Oxyrhina', Agassiz. 
Oxyrhina crassidens, new, R.3. (Tab. XXXI. figs. 13 & 137.) 
This large and thick tooth I discovered at Houghton ; it differs from O. Man- 
telli by being shorter and more obtuse. The shoulders are deeply corrugated, 
almost to give the appearance of the lateral denticles of an Otodus. 
Notes on the Order Ganoidei. 
Family Savuroipel. 
Genus Pomognathus*, new, Agassiz. 
Pomognathus eupterygius, R. 2. (Tab. XXXV. figs. 6 & 7.) 
The name Pomognathus was proposed by M. Agassiz, from the lower jaw ex- 
tending so far back towards the opercular bones. The teeth in the anterior portion 
of the jaws are exceedingly numerous, small, round and very pointed, sloping 
backwards towards the gullet. In the posterior extremities of the jaws, the 
teeth are few in number, considerably larger, flat and wide at their base. The 
pectoral, dorsal and ventral fins are displayed ; they are of large dimensions. 
It is allied to the genus Caturus of M. Agassiz. This beautiful fish forms a di- 
stinguished ornament in Mr, Catt’s collection, and is faithfully represented by 
M. Dinkel. Detached upper and lower jaws are occasionally discovered °. 
Genus Belonostomus*, Agassiz. 
Belonostomus cinctus, R. 2. (Tab. XXXV. figs. 3 & 3*.) 
This magnificent specimen agrees in most of its characters with the genus 
1 9eN ey 2 a , . 
obus acutus, ply nasus. ropa operculum, yva0os maxilla. 
* Bedovn acumen, oropa os. 
oi 2 
* The tail is reversed in fig. 6. 
