58 VERTEBRATA. 



No. 209. Ichthyosaurus intermedins, Conyb. 



Head, part op Trunk, and Paddles. This specimen was discovered in 

 the Lias at Boll, Wirtemberg, and is in the Museum at Halle. 



Size, 2 ft. 11 in. xl4 in. Price, $6.00. 



No. 210. Ichthyosaurus intermedius, Conyb. 



Eight and Left Fore-Paddles. From the Lias of Lyme-Regis, England, 

 and now in the Museum at Halle. Size, 14 x 5. Price of both, $3.00. 



No. 211. Ichthyosaurus communis. Conyb. 



Skeleton on slab. This species was the most " common" when first discov- 

 ered in 1824, but has since been surpassed in regard to the known number of 

 individuals. With respect to size, it is second only to the Ichthyosaurus platyodon. 

 It is characterized by a skull wide behind and rapidly contracting to the base of 

 the jaws, which are prolonged and sub-compressed. The teeth are relatively 

 large, with expanded, deeply-grooved bases and round conical furrowed crowns ; 

 the upper jaw contains from forty to fifty on each side, and the lower jaw, from 

 twenty-five to thirty. The anterior paddles have one hundred more phalangeal 

 bones than those of Ichthyosaurus intermedius, and are three times longer than 

 the posterior pair. This specimen is from the Lias of Lyme-Regis, England, and 

 is in the British Museum. Size, 7 ft. 1 in. x 2 ft. 2 in. Price, $16.00. 



No. 212. Ichthyosaurus communis, Conyb. 



Head on pedestal. This 

 is a fine specimen, having all 

 the bones and teeth complete 

 and in true position, and show- 

 ing well the sclerotic plates 

 which defended the eye. Dis" 

 covered in the Lias at Barrow-on-Soar, England, and now in the private Geologi- 

 cal Museum of Mr Ward, at Rochester. Size, 2 ft. 2 in. x 8 in. Price, $5.00. 



No. 213. Ichthyosaurus communis, Conyb. 



Skull, with jaws and teeth complete. It is from the Lias at Lyme-Regis, 

 England, and is in the British Museum. Size, 19 x 5. Price, $2.50. 



No. 214. Ichthyosaurus communis, Conyb. 



Paddle. From the Lias in Boll, Wirtemberg, 

 and now in the Imperial Museum at Vienna. 



Size, 11 x 5. Price, $1.25. 



No. 215. Ichthyosaurus platyodon, Conyb. 



Head. This species is the most gigantic of Ichthyosauri, attaining the 

 length of thirty feet. It derives its name from the crown of the tooth being 

 more flattened than in other species. The bodies of the vertebra? are also more 

 compressed. The head is relatively larger than that of Ichthyosaurus communis; 

 the lower jaw is remarkably massive and powerful, and projects backwards 

 beyond the joint, as far as it does in the Crocodile. The fore and hind paddles 



