BELONORHTOCHUS ACUTUS — CHONDROSTEUS (?). 
197 
Family BELONOEHYNCHID^. 
Belonorhynchus acutus (Agassiz). 
The jMuseum contains part of a jaw with teeth (a nice specimen) from 
the Lower Lias, Barrow-on-Soar, and Mr. Harrison records,* under its former 
generic name of Belonostomus, the finding of this, in 1874, in the Limestone 
“ Bank Hurs,” in a section of a large pit between Barrow and Sileby. 
Saurichthys acuminatus, Agassiz. 
The Museum possesses over twenty-five teeth, collected by Mr. Harrison 
from the Rhaetic bone-bed. Spinney Hills ; also a quantity of scales from the 
same place, labelled as belonging to this species, but this must be an error, as 
Mr. A. S. Woodward informs me “ Saurichthys is a long-snouted fish without 
scales.” (See, however, ‘Quarterly Journ. Greol. Soc.,’ 1877, p. 569.) 
A number of teeth collected from the same place by Mr. Quilter, and 
described by Mr. Woodward,! have since been acquired by the Museum, which 
also contains several labelled Saurichthys apicalisjt Agassiz, and there are some 
in Mr. Quilter’s collection, but Mr. Woodward considers that the two species 
are probably referrible to one, as, no doubt, there is “ considerable variation in 
the dentition of different parts of the mouth.” 
Family CHONDEOSTEID^. 
Ghondrosteus (?), Agassiz (sp. ind.). 
MTien visiting the Barrow-on-Soar Lias lime-pits some years ago, I was 
kindly presented, by the Messrs. Ellis, with two slabs shewing portions of a fish, 
which, being unable to determine, I referred, as usual, to Mr. A. S. Woodward, 
whose kindness to me in such matters it is impossible to over-estimate, and 
who replied ; — “ This unique and interesting fossil is the caudal portion of a fish 
evidently related to Chond/i^osteus, well known irom Lyme Regis, and probably 
pertains to the same genus. The fulcral scutes upon the upper lobe of the 
tail are equally large, but too much broken to exhibit their precise form and 
proportions. A few of the characteristic oat-shaped scales upon the side of the 
caudal lobe are preserved ; and there are several distinct, broad, hour-glass- 
shaped hsemal spines supporting the caudal fin. The latter consists of rays 
articulated as in Ghondrosteus, but the outline of the fin is not shown. 
Remains of the dorsal and anal fins are also preserved in their natural situations, 
but each fin is much broken and scattered. The dorsal is considerably in advance 
* ‘Geol. Leicestershire and Rutland,’ p. 37. 
t ‘ Trans. Leicester Lit. and Phil. Soc.,’ April, 1880, pp. 20-21. 
X Mentioned ‘ Geol. Leicestershire and Rutland,’ p. 35. 
