70 



VEKTEBEATA. 



No. 261. Leptorhynchus G-angeticus;Faic.andCaut. 



Head, truncated. Original from the same locality and Museum as the pre- 

 ceding Size, 12x8. Price, $8.50. 



Lacertilians. 



No. 262. Mosasaurus HofFmanni, Mantell. 



Head, on slab. 

 This is the most re- 

 markable and extreme 

 modification of the la- 

 !H| certian type in the 

 Wm. Cretaceous Period. It 

 |jl| had large pointed 

 H| teeth, pyramidal and 

 |jjf| slightly recurved, ex- 

 ; tj* ; \ panding at the base, 





yb« 



i " inch «;is aiiciiyinscil 



■ "W to the top of the alveo- 

 ^W lar ridge. In tlie low- 

 er j aw there were four- 

 teen teeth on each side 



and in the upper, eleven ; and Cuvier supposed that the intermaxillary bone 

 which is wanting, contained three more. In addition to these, the gigantic Rep- 

 tile had its pteryoid bone armed with teeth, like the Iguana. The vertebrae were 

 concavo-convex like those of living Crocodiles, Monitors, and Iguanas. The tail 

 was flattened, and the feet were probably webbed. The length of this marine 

 animal has been estimated at twenty -five feet. The remains have been found ex- 

 clusively in the Chalk formation, This celebrated specimen, now in the Garden 

 of Plants, was discovered in 1780 by Dr. Hoffmann, in the Upper Chalk, near 

 Maestricht, Netherlands. It consists of both sides of the lower jaw, with the 

 right ramus of the upper jaw in its natural position, and the left lying across the 

 left ramus of the lower ; the pterygoid bones ; the left tympanic bone ; one of the 

 metatarsal or metacarpal bones ; and some fragments. 



Size, 4 ft. 10 in. x 3 ft. Price, $60.00. 



No. 263. Mosasaurus HofFmanni, Mant. 



Lower Jaw, right ramus. Size, 3 ft. 1 in. x 11 in. Price, $7.00. 



No. 264. Mosasaurus HofFmanni, Mant, 



Fragment op Lower Jaw, with old and young teeth. 



Size, 18x7. 



Price, $3.00. 



No. 265. Rhynchosaurus articeps, Owen. 



TRACKS, On slab. This edentulous Reptile had a skull resembling in gen- 

 eral aspect that of a Bird or Turtle. The feet were of very nearly equal size, 



