118 R. S. Lull — Cretaceous Armored Dinosaur, 



Metatarsal II has also the greatest proximal area. Some 

 question may exist as to the position of the phalanges, 

 but some were in contact, and of these there can be no 

 question. Digit I is correct throughout, of II the asso- 

 ciated ungual is doubtful, of III there is little question, 

 but ly is incomplete. The metatarsals are narrow in 

 mid-length, with dilated extremities, and the unguals are 

 broad and hoof -like. The articular ends of the bones are 

 relatively smooth, as with the limb bones, but here the 

 distinction from Stegosaurus stenops (Y. P. M. 1856) is 

 less marked, as the proportion of articular cartilage must 

 have been relatively small in either case. 



Measurements of Pes. 



mm. 



Metatarsal I, length 85 



Entire first digit, length 210 



Metatarsal II, length 125 



Metatarsal II, max. diameter, proximal end ... 73 



Metatarsal II, max. diameter, distal end 71 



Metatarsal II, max. diameter, mid-shaft 42.5 



Entire second digit, length 240 



Metatarsal III, length, est 130 



Entire third digit, length 290 



Metatarsal IV, length 124 



EXOSKELETON. 



Armor. 



General character.— Isiarsh^s description of the armor of 

 Nodosaurus defines two types of elements, the one regu- 

 larly arranged in a series of rounded knobs in rows which 

 suggested the generic name, the other consisting of 

 dermal ossifications placed near the head (italics mine). 

 These were described as quite small, quadrangular, 

 arranged in rows, with their external surface peculiarly 

 marked by a texture that appears interwoven, like a 

 coarse cloth. ^ This has suggested the specific name and 

 is well shown in the only figure Marsh published to repre- 

 sent the animal (our fig. 1). His reference of these 

 elements to a position near the head is not founded upon 

 observed fact, as no trace of the head and neck of the 

 animal is present, but was probably reasoned from 

 analogy, as small rounded scutes have been found in situ 

 near the head of Stegosaurus. As a matter of fact, the 

 two sorts of dermal elements were contiguous, and in 



