ASPIDORHYNCHIDiE. 
427 
the cranium ; cranial bones ornamented with prominent rugse and 
granulations, mandible almost smooth ; principal mandibular teeth 
broad, of moderate size, and well spaced ; presymphysial bone about 
three times as long as its maximum depth. 
Form. Sf Loc. Bathonian; Oxfordshire. 
39199, 39200. The type specimens, two skulls described and 
figured in Proc. Geol. Assoc, vol. xi. p. 295, pi. iii. figs. 
11, 12 ; Stonesfield Slate, Stonesfield, near Oxford. 
Bowerbank Coll. 
P. 959. Two portions of cranial roof; Stonesfield. Egerton Coll. 
P. 3720 a. Bight maxilla, figured loc. cit. pi. iii. fig. 13 ; Stonesfield. 
Enniskillen Coll. 
P. 877 b. Fragment probably of a maxilla of this species ; Stones¬ 
field. Egerton Coll. 
P. 3720 b. Left dentary bone, figured loc. cit. pi. iii. fig. 14 ; 
Stonesfield. Enniskillen Coll. 
41294. Left dentary; Stonesfield. Purchased, 1869. 
P. 877 a, c, d. Three imperfect dentaries; Stonesfield. 
Egerton Coll. 
P. 3720 C, d, e. Three imperfect dentaries; Stonesfield. 
Enniskillen Coll. 
P. 3720 g. Presymphysial bone with teeth, shown of the natural 
size in PI. XVII. fig. 11. Enniskillen Coll. 
P. 3720 f. Imperfect left pterygoid arcade; Stonesfield. 
Enniskillen Coll. 
The following specimen is too imperfect for specific determina¬ 
tion :— 
P. 2058. Much-disturbed remains of a fish measuring about 036 
from the pectoral arch to the base of the caudal fin ; 
Lithographic Stone, Cirin, Ain, France. The trunk 
appears to be stouter than in A. acutirostris from Bavaria, 
and all the scales exhibited are smooth. Bing-vertebrae 
are displayed, and the ribs shown in the abdominal region 
are both short and delicate. Of the anal fin 16 supports 
are preserved, while there is only evidence of 12 rays in 
the dorsal. Egerton Coll. 
Aspidorliynchus silesianus is an undefined name given by Hohe- 
negger to some fragments from the Aptian of Wernsdorf, Moravia, 
