WOODWARD : FOSSIL FISHES OF THE UPPER LIAS OF WHITBY. 459 
As already mentioned, complete heads with a cranium of 
similar proportions to that named B. acutus are known from 
the Lower Lias ; and, in the absence of all evidence that the 
trunk differed in the two forms to which these heads belonged, 
it is necessary to record them provisionally under one and the 
same specific name. The head of the Lower Lias fish is from 
four and a half to five times as long as its maximum depth ; 
the distance between the orbit and the occiput considerably 
exceeds the maximum depth of the mandible, while the angular 
bone of the latter is much truncated though gentl}^ rounded 
postero-inferiorly. Its superficial ornamentation consists of short 
rugae, the majority directed longitudinally. 
Belonorhyiichus hrevirostris, A. S. Woodward. 
1858. Belonostomus axutus, F. A. Qaenstedt (errore), Der Jura, 
p. 234, pi. xxix., fig. 8. 
1892. Saurorhynchus acutus, O. M. Reis, Geogn. Jahresh. 1891, 
p. 145 (in part), figs. 1-3. 
1895. Beloiiorhynchus brevirostris, A. 8. Woodward, Catal. Foss. 
Fishes B. M., pt. iii., p. 17, pi. ii., fig. 2. 
Type : Head from Lower Lias, Lyme Regis ; British Museum. 
The fine head of Belonorhyiichus from the Upper Lias of 
Wiirtemberg, referred by Quenstedt to B. acutus, differs con- 
siderably from the t}'pical Whitby skull in its greater depth 
and shorter rostrum ; and similarly short and deep skulls are 
also known from the Lower Lias of Lyme Regis, associated 
with the elongated type already described. These fossils are 
therefore now regarded as representing a distinct sj^ecies, 
B. brevirostris. 
Only one example of this comparatively short skull claimed 
to be a Whitby fossil, is known to the present writer, namely, 
an abraded specimen from Dr. Bowerbank's collection in the 
British Museum (IS^o. 39,153). An examination apparently of 
this specimen caused Professor Blake to doubt the record of 
its origin (o]j. cit., p. 259) ; but the matrix in which it is 
