CRETACEOUS ANIMALS. 



487 



was found in Europe, on the river Meuse, and hence the name Mosa- 

 saurs ; but they seem to have been far more abundant in America. At 

 least fifty species (Cope) have been found in the Cretaceous of New 

 Jersey, the Gulf States, and Kansas. Of these, the Mosasaurus prin- 



Fig. 817 



Figs. 815-817.— 815. Snout of a Tylosaurus micromus, x j- (after Marsh). 816. A. Scapular arch and 

 fore-limbs of Lestosaurns simus (after Marsh), seen from below, one sixteenth natural size, 

 with outline of sternum from Edestosaurus. B. Pelvic arch and hind-limbs of Lestosaurns 

 simus, seen from below. One twelfth natural size. U, ilium; pb, pubis; is, ischium; /, femur; 

 t, tibia; /', fibula; mt. metatarsal. The paddles are represented as horizontal, and the bones of 

 the arches are somewhat displaced to bring them into the same plane. 817. Tooth of a Mosa- 

 saurus, x i (after Leidy). 



ceps was sixty to seventy feet long, and Tylosaurus (Liodon) clyspelor 

 probably "attained a length equal to the longest whale" (Cope). 

 These reptiles seem to have united the long, slender form of a snake, 



