492 A. Smith Woodward—On the Genus Anomeodus. 
placed quite on the side of the bone. There is, however, as yet 
no means of distinguishing the vomer of Ccelodus from that of 
Anomeodus; and none of the detached specimens hitherto dis- 
covered can be referred with certainty to the species named from 
the evidence of lower jaws. 
In recording some new examples of the vomerine dentition from 
Cretaceous rocks, it is therefore inadvisable to attempt their specific 
and generic determination; and we merely give the accompanying 
figures of four well-marked types (Plate XVII. Figs. 2-4, 7) 
without names. The original of Fig. 2, in the British Museum, 
was obtained from the Greensand of the Isle of Wight, and com- 
prises three series of tumid, faintly indented teeth almost in one 
plane, with a very minute outer series well on each side of the 
bone. The originals of Figs. 3 and 4, in the Woodwardian Museum, 
are from the Cambridge Greensand: the first is remarkable for 
the relatively great width of the median teeth and the convexity 
of the dentigerous face (best observed in side-view, Fig. 3a), while 
the second is noteworthy for the flatness of the grinding surface 
formed by the three principal series of teeth. 
Most interesting of all, however, is the small vomerine dentition 
from the Chalk of Charing, Kent, shown of twice the natural size 
in Fig. 7—a form represented in the British Museum by still 
another larger specimen from the Chalk of Southeram, Sussex. The 
worn teeth are coarsely punctate, and all seem to have been obtusely 
conical, though sometimes with an apical indent. Similar detached 
teeth have already been found in the Chalk of Bohemia and Saxony, 
and described under the name of Pyecnodus scrobiculatus!; while 
portions of the vomerine dentition exactly similar to those now 
made known from the English Chalk have been described and 
figured by Geinitz? from the Turonian of the valley of the Elbe. 
Nothing is known of the true generic relationships of the fossils, 
and they may thus at present remain under the provisional name 
originally proposed by Reuss. 
EXPLANATION OF PLATES. 
PLATE XVI. 
Fic. 1.—Athrodon intermedius, sp. nov.; left splenial dentition. Purbeck Beds; 
Aylesbury. [British Museum, No. 40314. ] 
») 2.—Athyodon tenuis, sp. noy.; right splenial, from the oral, inner (2a), and 
inferior (24) aspects. Lower Senonian ; Lonzée, near Gembloux, Belgium. 
[Royal Museum, Brussels. } 
», 98.—Athrodon crassus, sp. noy.; right splenial, from the oral, inner (8a), and 
inferior (3), aspects. Cambridge Greensand; Cambridge. [Wood- 
wardian Museum, Cambridge. | 
», 4.—Athrodon, sp.; vomerine dentition. did. [ Woodwardian Museum. | 
», 9.—Anomeodus superbus, sp. nov. ; left splenial, oral and inferior (5a) aspects. 
Ibid. { Woodwardian Museum. | 
», §.—WMesodon Damoni, A. 8S. Woodward ; left splenial, inferior aspect. Port- 
land Stone; Weymouth. [British Museum, No. P. 6165.] 
1 A. E. Reuss, ‘‘ Versteinerungen der béhmischen Kreideformation ’’ (1845), p. 
10, pl. iv. figs. 15-25, 64. 
* H. B. Geinitz, Paleontogr. vol. xx. pt. i. (1875), p. 801, pl. lxv. figs. 31, 32. 
