STROPHODUS TEETH IN THE CORALLIAN 
BEDS OF MALTON. 
J. WILFRID JACKSON, F.G.S., 
Manchester Museum. 
WITH reference to the note on Asteracanthus in the Coralline 
Oolite, in ‘ The Naturalist,’ (p. 130), the Manchester Museum 
possesses specimens of Strophodus teeth from the Coralline 
Oolite of Yorkshire. Four examples in all are included in the 
collection. Two of these are attached to the matrix, and possess 
a label as follows: ‘ Strophodus sp. Malton, Yorkshire. Coralline 
Oolite.. They have been in our collection for some consider- 
able time, but are without particulars as to the donor. The 
other examples are loose teeth minus the roots; they are 
labelled, ‘ Strophodus tenuis Agassiz, Coralline Oolite, E. Coll. 
Wilhamson.’ Though no locality is given on the label, it is 
nor unreasonable to suppose that they came from the neigh- 
bourhood of Malton, as nearly all Williamson’s researches were 
made in Yorkshire. Some evidence is afforded by the fact 
that most other Corallian fossils in the Williamson collection 
are labelled ‘ Malton.’ 
The four teeth are in an abraded and rolled condition. 
All four, however, approximate nearer, both in shape and 
details of ornamentation (where this is visible), to the type 
of dentition named by Agassiz ‘ Stvophodus reticulatus,’ than 
to any other. 
‘~ Other vertebrate remains from the Malton beds contained 
in the Manchester Museum collections are :—A fine series of 
the teeth of Hybodus obtusus Agassiz; two much abraded 
teeth of a Pycnodont Ganoid, either Mesodon bucklandi (Ag.) 
or M. rugulosus (Ag.); and two or three loose Crocodilian 
teeth belonging to Steneosaurus and Teleosaurus. 
We have also a dorsal fin-spine, doubtless referable to 
Hybodus obtusus, which was obtained from the Corallian at 
Headington, Oxfordshire, by Mr. P. Manning. 
Spines of this species appear to be of very rare occurrence, 
in fact, the only example that I am acquainted with is one 
figured and described by Mr. H. M. Platnauer* from the Coralline 
Oolite at Malton. 
The Headington specimen measures some 264 mm. in 
length, but is not perfect, as a small portion is broken away 
from each end. It is moderately well-preserved, but, owing 
to its having been much rolled about, the flat characteristic 
ridges are only discernable in certain places. 
From the same beds Mr. Manning also obtained several 
teeth of Hybodus obtusus, which he has presented to the museum. 
* Ann. Rept. Yorks. Phil. Soc. (1887), 1888, p. 36, pl.i., f. 16. 
1gtr April 1. 
