406 Miscellaneous. 



head from the Kimmeridge Clay of Ely in the Woodwardian Mn- 

 Beum. About twice as large as the typical E. speciosus, aud differ- 

 ing in the granulation of the head-bones. 



2. Strobilodus suclioides, Owen, sp. — As suggested by Yon Zittel, 

 the so-called Thiattodus suclioides, 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. Leedsi) 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 distingiiished 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 Hypsocorrmis and that of the Upper Cretaceous Protosphyrama ; 

 two large tusk-like teeth at the base of the snout in each genus 

 bein"- opposed to a pair of similar teeth on each side of the mandible 

 fixed in sockets in a short, stout, splenial bone. 



4. Leedsiclitliys ixrohlcmaticus, 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 irrohlematicus. 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 

 irreo-ularly -<-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 

 incomi^letely fused together, and the two halves of the ray remain 

 separate. The jaws and axial skeleton of the trunk are still 

 unknown. 



5. Thrissop>s. — 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 



