234 UPPER, OR FLINTY CHALK. 



every essential particular of this description, the fossils alluded to, will be 

 found to correspond. 



113. Zeus Lewesiensis. Tab. xxxv. figs. 1,2. Tab. xxxvi. 

 . This species is from six to eight inches long ; and its width is nearly 

 equal to the length of the body, exclusive of the head. It is covered with 

 large, ovate, striated scales; the back and abdomen are ridged, and gently 

 arched; and the body is thin, and compressed. The head is somewhat 

 obtuse, and large in proportion to the body; the orbits project, and are 

 placed high in the head. The lower jaw is straight, the vipper one 

 slightly arched; and both are destitute of teeth. The opercula hrancliialia 

 are large, and there are six branchiostegous rays. The dorsal and anal 

 fins are placed opposite to each other, and extend over two-thirds of the 

 posterior part of the body, but do not unite with the tail ; the rays of the 

 dorsal fin appear to pass into long filaments, as in the recent Dory. The 

 pectoral fins have not been observed. The caudal fin, or tail, is rounded, 

 and composed of numerous strong rays. The vertebrge are about twenty 

 in number : in most instances the ribs still remain attached. 



The above description is taken from upwards of twenty specimens, not 

 one of which is sufficiently entire, to indicate the structure of the original, 

 without the assistance of other examples. Those figured, are the most 

 perfect in my possession, and will serve to illustrate the general appear- 

 ance of this species. It seemed unnecessary to dehneate detached parts. 



Tab. xxxv. fig. 1. A portion of the body, exposing several vertebra?, 

 with the ribs attached. 



Tab. xxxv. fig. 2, and Tab. xxxvi. are corresponding parts of the same 

 specimen. In fig. 2, the drawing is inverted, the fish being represented 

 with the abdomen uppermost. It exhibits the anal fin, the termination of 

 the lower jaw, and numerous remains of the bones of the head. 



In Tab. xxxvi. the same parts are more distinctly shewn; and also the 

 elongated rays of the dorsal fin, with part of the tail, &c. 



Localities. Upper chalk, near Lewes, and Brighton. 



