1 899-] Osborn^ Carnivorous and Herbivorous Dinosaurs. 1 65 



2. Hind Limbs of Cetiosaurs. 

 Figure i. 



The smaller of these limbs (Fig. i, A, No. 251) was fortunately 

 found nearly complete and in position, all parts being preserved 

 excepting the head of the femur. It was removed and worked out 

 with the greatest care by Mr. Granger. There is thus absolutely 

 no doubt about the position of the phalanges. 



This limb is of a type distinct from the larger one, which is 

 undoubtedly a Brontosaurus. We should unhesitatingly refer it 

 to Diplodocus, were it not that the fourth trochanter has a more 

 elevated position than in the Diplodocus femur recently described 

 by the writer/ and that the pes differs from the pes of Diplodocus 

 figured by Marsh ('96, Plate 28). None the less it is a long-limbed 

 type, and this we believe to be a characteristic distinction of 

 Diplodocus. It has the following characters : 



1. Tibia and fibula very long and slender. 



2. Femur long with relatively slender shaft. 



3. Metatarsals I and II as in Brontosaurus. 



4. Metatarsal III much more slender than in Brontosaurus. 



5. Metatarsal IV still more slender, two osseous phalanges. 



6. Metatarsal V more slender, no osseous phalanges. 



This limb may prove, therefore, to represent merely a form of 

 Brontosaur distinct specifically from B. excelsus. But, in spite 

 of the e.xceptions noted above, the probabilities are that it belongs 

 to Diplodocus, for this animal is abundantly represented in the 

 Bone Cabin Quarry by parts of several series of caudal vertebrcC, 

 besides pelvic and other bones. 



Measurements. 



No. 251. No. 309. No. 353. 



Total height of limb e 2920 3040 



Femur, height e 1430 1640 



Femur, circumference below tr. 4 560 e 730 



Tibia, length ro6o 1080 



Tibia, circumference 390 e 480 



Fibula, length 1120 1130 



Astragalus, width uf 227 280 



Pes, width of proximal metatarsal surfaces, 410 445 



The circumferences of the various shafts are very important 



' Osborn, "A Skeleton of Diplodocus." Mem. A m. Mus. Nat. Hist., I, Pt. IV, 1899. 



