A. Smith Woodward—On the Genus Anomeodus. 491 
to be identified with the pre-operculum. On comparing the arrange- 
ment with the skulls of recent fishes no closer parallel can be found 
than in some of the Plectognathi, where the specialization seems to 
be much of the same character. Whether, however, the agreement 
be a real proof of close affinity, or whether it be merely a case of 
similar mechanical conditions leading to analogous modifications, 
cannot be determined until the osteology of all the principal Pycnodont 
genera has been investigated. 
Form. and Loc.—Turonian ; Sussex. 
3. DescripTION OF THE SPLENIAL DentTITION OF TWO NEw SPECIES 
OF C@LODUS. 
There still remains much fragmentary evidence of species of 
Coelodus hitherto unrecognized, and it seems advisable to propose 
specific names for the two well-marked new forms of splenial 
dentition described below. The specimen from the Chalk is as yet 
unique, and but few examples of the Cambridge Greensand fossil 
have come under the writer’s notice. 
Ca@Lopus INmQuIDENS, sp. nov. Plate XVII. Fig. 8. 
Type. Left splenial, with dentition; British Museum. 
A species of moderate size, known only by the splenial dentition. 
Teeth of principal series attaining a breadth somewhat more than 
twice as great as their length, and exceeding in width the two flank- 
ing series, of which the inner teeth slightly exceed the outer in size, 
all being about as broad as long; a row within the principal series 
represented by few minute round teeth; all the teeth smooth. 
This species is noteworthy for the smoothness and relatively small 
size of the two flanking series of teeth on the splenial bone. 
Form. and Loc.—Cenomanian ; Cambridgeshire. 
C@LopUS FIMBRIATUS, sp. nov. Plate XVII. Fig. 6. 
Type. Imperfect right splenial dentition ; British Museum. 
A large species, known only by the splenial dentition. Teeth of 
principal series on the splenial bone smooth or feebly crimped round 
the margin, somewhat less than three times as broad as long, about 
equalling in width the two outer series, which are nearly similar in 
size, irregular in form, slightly broader than long, and have a deep 
coronal pit with rugose or crimped margin. 
The type and only known specimen shown of the natural size in 
Pl. XVII. Fig. 6, was obtained from the Lower Chalk of Halling, 
Kent. 
Form. and Loc.—Turonian; Kent. 
4.—Somrt UNDETERMINED SPECIMENS OF THE VOMERINE DENTITION. 
Among Cretaceous Pycnodonts there is a general tendency for 
the dentigerous face of the vomer to become narrowed and convex 
in transverse section; while three series of teeth are alone well 
developed, the outer flanking series being usually very small and 
