406 Miscellaneous. 
head from the Kimmeridge Clay of Ely in the Woodwardian Mu- 
seum. About twice as large as the typical H. speciosus, and differ- 
ing in the granulation of the head-bones. 
2. Strobilodus suchoides, Owen, sp.—As suggested by Von Zittel, 
the so-called T'hlattodus suchoides, Owen, from the Kimmeridge Clay 
of West Norfolk, is certainly generically identical with the previously 
described Strobilodus giganteus from the Bavarian Lithographic 
Stone. 
3. Hypsocormus Leedsi, sp. nov., and Hypsocormus tenuirostris, 
sp. nov.—The jaws of two new species of Hypsocormus have been dis- 
covered in the Oxford Clay of Peterborough by Mr. Alfred N. Leeds, 
of Eyebury. The first (H. Leedsz) equals the Bavarian species H. 
macrodon in size, and has a similarly obtuse snout ; but it differs in 
the marked obliquity of the two great teeth in the upper jaw. The 
second species (H. tenuirostris) attains about half the size of the 
first, and is distinguished by the comparative elongation and acutely 
pointed form of the snout; the two great upper teeth seem to have 
been directed almost vertically downwards, as in H. macrodon. 
These fossils suggest an interesting comparison between the dentition 
of Hypsocormus and that of the Upper Cretaceous Protosphyrena ; 
two large tusk-like teeth at the base of the snout in each genus 
being opposed to a pair of similar teeth on each side of the mandible 
fixed in sockets in a short, stout, splenial bone. 
4. Leedsichthys problematicus, gen. et sp. nov.—This, probably 
the largest Jurassic fish hitherto discovered, is indicated by an asso- 
ciated series of bones from the Oxford Clay of Peterborough in Mr. 
Leeds’s collection. It can only be provisionally defined, and may be 
appropriately named Leedsichthys problematicus. None of the bones 
are externally ornamented, but all have a distinctly fibrous texture. 
A supposed frontal bone measures 2 feet in length by 1 foot 3 inches 
in maximum breadth; the hyomandibular is squamous, at least 
1 foot 3 inches in length ; and the bones of the branchial arches are 
irregularly =¢-shaped in transverse section, bearing numerous gill- 
rakers. The last-named bones are elongated, laterally compressed, 
slightly expanded at the base, and rarely straight, but irregularly 
bent and contorted; the surface is coarse and rugose, and one long 
border is rounded, while the other is cleft by a longitudinal median 
furrow ; the rounded border is comparatively smooth, but the fur- 
rowed edge is coarsely serrated, a series of short oblique ridges 
terminating in points on each side. The branchiostegal rays are 
very large, dense, and rounded in section, in not less than six pairs. 
The pectoral fin-rays sometimes attain a length of 5 feet, frequently 
dichotomously branching, but not jointed ; each consists of fibrous 
bone, appearing as if composed of numerous long tapering splints 
incompletely fused together, and the two halves of the ray remain 
separate. The jaws and axial skeleton of the trunk are still 
unknown. 
5. Thrissops.—Though not hitherto recorded, remains of the genus 
Thrissops are preserved in the British Museum from the Kim- 
meridge Clay and Portland Stone of Dorsetshire; the former equal 
