216 



REPTILIA 



CLASS III 



Alligatorellus, Jourdan (Fig. 316). Total length 22 cm. Cranial bones 

 faintly sculptured. Nasals elongated, and apparently dividing the external 



Fig. 316. 

 Alligatorellus beaumonti, Jourdan. Upper Jura ; Cerin, Ain, France. 1/2- 



nares. Tail very long ; at least thirty candals. Lithographic Stone ; Cerin, 

 France. 



Atoposaurus, v. Meyer. Tail very long, comprising over fifty caudals. 

 Dorsal armour not observed. Otherwise like the preceding. Lithographic 

 Stone ; Cerin, France, and Bavaria. 



Family 2. Goniopholidae. (Metamosuchia, Hulke.) 



Small to large- sized crocodiles. Orbits usually smaller than supratemporal 

 vacuities. Internal narial opening remote, at hinder margin of palatines, and 



bounded in part by the 'pterygoids. Dorsal armour comprising 

 two or more longitudinal series of overlapping and sometimes 

 articulating scutes. Ventral scutes suturally united. Pur- 

 beckian and Wealden. 



Goniopholis, Owen (Diplosaurus, Marsh ; Amphicotylus, 

 Hyposaurus, Cope), (Fig. 317). Snout moderately long, 

 nasals not quite reaching external nostril ; supratemporal 

 vacuities larger than the orbits. Twenty -three stout 

 teeth on each side of either jaw, carinated and vertically 

 grooved. Ventral armour consisting of seven to ten 

 longitudinal series of polygonal plates united by jagged 

 sutures. Skull in some species attaining a length of 

 70 cm. G. simus, Owen, known by complete skeletons 

 about 2 m. long, has limbs of equal size. Purbeckian 

 ,,;;; , .„.' ';;;;;■ and Wealden ; England, Belgium, and Northern Germany. 



1 Posterioi portion Upper Jura : Colorado. 



ofpalate. bo, Basioccipital ; z> • i • t\ n *, • • -, i <• -, 



iornare ; pi, Paia- nernissartia, Dollo. Attaining a length of 1 m. 



1 < after Supratemporal vacuities smaller than the orbits, nasals 



not reaching the external nostril. Twenty irregular 



eetli on each side of either jaw; fore-limbs much shorter than the hinder 



Dorsal armour with more than two longitudinal series of over- 



Fig. 317. 



