28 Notices of Memoirs — A. 8. Woodw. — Chalk Sahnonoid Fishes. 



Fig. 3. 



Fig. 4. 

 Fig. 5. 

 Fig. 6. 

 Fig. 7. 



Fig. 8. 

 Fig. 9. 



Fontocypris pyriformis, sp. nov. ; a, \ 



left valve ; b, edge view ; c, end 



view. 

 Cypris Dawsoni, sp. nov. ; «, left 



valve ; h, edge view ; c, end view. 

 Ilyocypris oblonya, sp. nov. ; «, right 



valve ; b, edge view ; c, end view. 

 Cythere, sp. indeterminate. Two^ 



valves, imperfect. 

 Candona ? Sanctm-Maria, sp. nov. ; 



a, left valve ; b, edge view ; c, end 



view. 

 Cytherella crucifera, sp. nov. ; a, right 



valve ; b, edge view ; c, end view. ^ 

 Candona (?), sp. indeterminate. Dorsal l IV. 



aspect. j 



>II. Loose block. ^ 



III. North Branch, 

 Milk River. 



Old-Man 

 River. 



Saint-Mary- 

 River Beds. 



isroTiciES OIF" nvcEnvnoiias. 



A Description of the so-called Salmonoid Fishes of the 

 English Chalk. By A. Smith Woodward, F.G.S.^ 



OF English Cretaceous fishes three genera (Osmeroides, Aulolepis, 

 and Acrognathus) are commonly assigned to the Salmonidse. 

 None have hitherto been described in detail, and the present paper 

 is intended to give a full account of the osteology of the two first- 

 mentioned genera, so far as the best specimens will allow. Nothing 

 new has been discovered in reference to Acrognathus. 



Osmeroides Leioesiensis is proved by several specimens in the British 

 Museum to possess a large, though very thin gular plate between the 

 rami of the mandible. The branchiostegal rays are numerous, 

 and the opercular apparatus is complete. The marginal teeth are 

 extremely minute and clustered in both jaws. The maxilla is 

 arched, exhibiting a convex oral margin, and overlapped above by 

 two large supramaxillaries, shaped as in the herrings. The parietal 

 bones meet in the median line, excluding the supraoccipital from the 

 cranial roof. Thin plates completely cover the cheek. Intermuscular 

 bones appear to be present in the abdominal region. 



The type skull of Osmeroides crassus (Dixon) is now described 

 for the first time, and proved to be generically distinct from 0. 

 Leioesiensis. It has large, well-s]3aced conical teeth, and so much 

 resembles the skull of Elopopsis, not hitherto recorded from the 

 English Cretaceous, that the fossil may be provisionally assigned to 

 this genus. 



Aulolepis typus agrees with Osmeroides Lewesiensis in the possession 

 of a large gular plate, the meeting of the parietal bones, the very 

 small size of the teeth, and the form of the supramaxillaries. It 

 is remarkable for the advanced situation of the pelvic fins, and for 

 the prominent ridge produced by the " lateral line " on the scales of 

 the caudal region. 



In determining the systematic position of these fishes from the 

 English Chalk, it is, of course, impossible to refer to the most 



1 Abstract of a paper read before the Zoological Society, November 20, 1894. 



