In. 



Lin. 



11 





2 



11.2! 



4 



6. 



4 



9. 



] 



10. 



2 



9. 



1 



10. 



1 



6. 



1 



4. 



AND AVES OF NORTH AMERICA. 67 



Length of portion of femur, 



Largest diameter below head. 



Convex extent of head, 



Circumference of shaft, 



Diameter of tibia two inches below head, 



Length of condyles of humerus, 



Diameter of inner condyle, 



" region between condyles, 



" shaft 2.5 inches above condyles, 



Greatest diameter of head of rib, 2 



Second — A fifth cervical, two lumbars and fragments of long bones from Birmingham, N. J. The cervical is con- 

 siderably larger than the last, and has the arches coossified ; its total length is 34^ lines, and is appropriate to the 

 adult condition of this animal. The lumbars indicate further the difference between this species and the Hoi. 

 obscurus. The cups and shoulder are more expanded latterly than in any species here enumerated, even near the 

 sacrum, and the centrum more depressed, and with concave sides. A very obtuse rib extends along the inferior 

 face. 



In. 

 Total length, 3. 85 



Length to shoulder, 2.3 



Width of cup, 1.76 



" shoulder, 1.76 



Both of these specimens represent the Crocodilus basitruncatus of Owen, and should 

 their reference to the Bottosaurus by Leidy prove erroneous, will indicate a species under 

 that specific name. 



From the Cretaceous greensand of New Jersey. 



HOLOPS, Cope. 



This genus, which appears to differ from Thoracosaurus only in the absence of lach- 

 rymal fossae, has probably been represented by several species during the Cretaceous period 

 in New Jersey. Vertebrae of two species have been described by Leidy as pertaining to 

 the genus Crocodilus. All of them differ from the species of the existing six genera of 

 Crocodilidse in the absence of elongate hypapophyses on the cervical vertebra?, and their 

 replacement by bified or simple often transverse tuberosities. As observed by Leidy, the 

 T. macrorhynchus from the cretaceous of France presents a similar character. 



The student should also notice that in this genus the axis is the longest vertebra, and 

 the third cervical the most constricted. The third cervical vertebra, as well as the axis, is 

 also in Alligator mississippiensis and Crocodilus biporcatus slightly more constricted 

 than the succeeding vertebra. The cups widen above to the fourth dorsal ; from 

 this point to the sixth the centra narrow rapidly, presenting more difference than in the 

 same distance elsewhere. The eighth begins to widen again, though still narrowed. 



