UPPER, OR FLINTY CHALK. 233 



instance having been noticed, in which they are disposed with any degree 

 of regularity. 



Tab. xl. fig. 2, represents the usual appearance of these fossils ; and 

 Tab, xxxix. fig. 11, the only example that retains the slightest indication 

 of a fin. In another solitary specimen, one extremity terminates in an ob- 

 tuse projection, hke an obscure outline of the head; it is however, too im- 

 perfect to warrant any speculation on the form of the original. 



Until more illustrative specimens shall be discovered, our conjectures 

 concerning the recent animal must be vague, and unsatisfactory. That 

 the remains in question are referable to a fish of the order Apodes, cannot 

 however be questioned, and they certainly appear to be more intimately 

 related to the genus Murana, than to any other with which we are ac- 

 quainted. 



In the quarries at OfFham, the remains of a narrow, compressed, 

 cylindrical body, evidently related to the preceding, are occasionally met 

 with. They are more or less contorted, possess a glossy surface, and are 

 of a light greenish colour ; the imperfect state of the specimens prevents a 

 more particular notice. 



Localities. Upper, and Lower chalk, near Lewes, and Brighton. 



Thoracic:. 



In the fishes of this order, the ventral fins are placed on the trunk, or 

 nearly under the pectoral fins. 



It is with some hesitation, that I refer to this division a thin com- 

 pressed fish, whose remains are frequently met with in the Upper chalk 

 near Lewes. This ichthyohteis related to the genera Stromateus, Chceto- 

 don, and Zeus; but in its general form, more closely resembles the recent 

 individuals of the latter. 



The fishes of the genus Zeus have the head compressed, and sloping, 

 the upper Hp arched, the tongue subulated, the body compressed, thin, 

 and shining ; and the rays of the first dorsal fin ending in filaments ; in 



H H 



