A.S. Woodesaid=2 British Jurassic Fishes. 449 
Stones of Bavaria, Wirtemberg, and Ain, especially, yield a rich 
assemblage of forms in a remarkable state of preservation; and it is 
now an interesting study to compare the British Jurassic fossils 
with their well-known continental allies. Such an undertaking is 
facilitated by the recent appearance of Prof. Dr. K. A. von Zittel’s 
admirable critical summary of the extinct Mesozoic fishes;* and it 
is the object of the present notice to offer some preliminary remarks 
upon a few of the more prominent types observed by the author in 
English collections. 
1. Eurycormus grandis, sp. nov. 
In 1863, A. Wagner” described a genus of fishes from the Litho- 
graphic Stone of Hichstaidt, Bavaria, under the name of Hurycormus, 
making known a single species, EH. speciosus; and in 1887, Prof. v. 
Zittel added some supplementary information to the original 
diagnosis, while publishing detailed figures of the vertebrae. No 
precise particulars, however, concerning the cranial osteology and 
dentition have hitherto been forthcoming; and the recent discovery 
by Mr. Henry Keeping, in the Kimmeridge Clay of Ely, of a fine 
head of Hurycormus, not only makes known the occurrence of a new 
species of the genus in England, but reveals structural features of 
considerable taxonomic significance. ‘The specimen is preserved in 
the Woodwardian Museum, Cambridge, and the author is indebted 
to the kindness of Prof. McKenny Hughes, F.R.S., for the oppor- 
tunity of undertaking a detailed study of its characters. The skull, 
jaws, and opercular apparatus agree precisely in general form and 
proportions with the corresponding parts figured in Wagner’s typical 
species, while two anterior vertebra exhibit the characters assigned 
to them by v. Zittel. The Ely species, however, is nearly three 
times as large as the Bavarian form, and differs (according to 
Wagner’s description) in the superficial tuberculation of several of 
the head-bones ; it may therefore receive the distinct specific name 
of Hurycormus grandis. 'The maxilla is narrow, and its arched 
margin is provided with a single close series of small slender teeth ; 
the vomerine or palatine bones (or both) bear a cluster of similar 
teeth of larger size; and the inner side of the mandible seems to be 
constituted by the splenial element, provided with at least one series 
of small teeth, while for a short space near the anterior end of each 
dentary are observed the sockets of about nine large teeth. Hach 
dentary bone is deep and plate-like, and, though much crushed, 
doubtless inclined inwards in its inferior half; and a very large 
elongated azygous jugular plate extends between the rami as far 
back as the suture between the dentary and angular elements. The 
hyomandibular bone is more lamelliform than in Pachycormus, etc., 
thus more nearly resembling the same bone in Caturus, the Lepto- 
lepide, and modern Teleosteans. 
1 “ Handbuch der Palzontologie,” vol. iii., pts. i. ii. (1887-88). 
* A. Wagner, ‘‘ Monographie der fossilen Fische aus den lithographischen Schiefern 
Bayerns,”’ Abh. k, bay. Akad. Wiss., cl, ii. vol. ix. (1868), p. 707, pl. iv. 
DECADE IlI.—VOL. VI.—NO. X. 29 
