ROOM V. SAUROIDS. 431 



hofen, on the uppermost ledge, and from the Oxford Clay of 

 Chippenham, immediately beneath, belong to this sauroid 

 genus, which comprises sixteen or eighteen species, that are 

 abundant in the upper divisions of the Oolite. The species 

 from Chippenham is the L. macropthalmus ; that from 

 Solenhofen, L. Knorrii. 



Cololites. On the front of the same shelf are placed some 

 small slabs of Solenhofen limestone, on which are convoluted 

 worm-like bodies, formerly termed lumbricarites, from the 

 supposition that they were petrified earth-worms. These 

 curious fossils M. Agassiz has ascertained to be the intestines 

 of fishes, and has, therefore, named them " Cololites." ! 



Aspidorhynchus. Wall-case B. (No. 10.) In the litho- 

 graphic stone of Solenhofen, specimens of sauroid fishes, 

 closely related to Lepidotus, are discovered ; they differ from 

 the latter genus in the extreme shortness of the lower jaw, 

 and the prolongation of the upper one into a long beak, 

 bearing teeth even in that part which projects beyond the 

 lower maxilla. The scales on the sides of the body are very 

 high, and the tail is homocercal. There is a fine specimen 

 (Asp. acutirostris) from Solenhofen in this Case, twenty-two 

 inches in length. Near this specimen there is an ichthyolite 

 of the same genus (Asp. Cumptoni) from South America. 



BELONOSTOMUS (B. cinctus). Wall-case B. (No. 10.) In 

 1820, I discovered the ichthyolites thus labelled, in the chalk, 

 at Lewes; the great extent of the scales on the side of the 

 body, in a vertical direction, was so remarkable, that until 

 portions of the jaws, with teeth and other parts of the body, 

 were obtained, the affinities of the original could not be 

 determined. This fish, M. Agassiz estimated at three 

 feet in length. A fragment, six inches long, of this spe- 

 cies, is figured in Mr. Dixon's work, PI. XXXV. fig. 3. I 

 have recently discovered remains of this genus in the Weal- 

 den of the Isle of Wight, associated with teeth and scales of 

 Lepidoti. 



Pygopterus (P. Humboldtii). Wall-case B. (No. 10,) In 

 this Case there is an ichthyolite from the copper-slate of 



1 Figured in Dr. Buckland's " Bridgewater Essay," PI. XV. See also 

 " Medals of Creation," p. 657. 



