xNo. iG«o. osTEOLoay or camptoi^aurus—gilmore. 271 



Tlie forui and proportiou of the various elements of the fore limb are shown in 

 Plate III. tig. 1. 



The pelvic arch is quite unlike any hitherto flescriberl. In its general form 

 the ilium resembles that of Morosaunis, but the proportions are reversed. The 

 massive portion in the present genus is not in front, but behind, as the ischium 

 is larger than the pubis. The relative position and form of the elements of 



the pelvic arch are shown 



ifWW ^^ *^^ figure below. 



The femur has a long 



pendant third trochanter, 



and a prominent ridge to 



])lav between the tibia 



wm \\»\ X ^^^^ fibula. The tibia is 



it B. f a ^i V , stout, and somewhat 



shorter than the femur. 



,, . --==^8*^ -^-«fc. Ttie fibula is slender, and 



shorter than the tibia. 



F ^''^^^l^ l // '^^^ astragulus and cal- 



p ^^^^^^^^*'^ caneum are distinct. 



The second row of tarsals 



Fig 36. — rELvic ahch of CAi\iPTOsAUKt;s (Camptonotus) contains but two bones. 



DisPAE Marsh. No. 1878, Yale Museum ; side view ; The first digit in the pes 



A NAT. size, a, acetabulum ; il., ilium ; is., ischium ; ^c^g rudimentary and did 



», pubis ; »' posTPUBis. After Maksh. . , .>,, ' ' j 



not reach the ground. 



The second, third, and fourth were well developed. The fifth was entirely 

 wanting. The number of phalanges, beginning with the first digit, was 2, 3, 4, 5. 

 The structure of the hind limb and foot is well shown in Plate III, fig. 2, which 

 is taken from the same skeleton as fig. 1. 



Some of the principal measurements of the present species are as follows : 



mm. 



United length of the nine cervical vertebrae 565 



Length of axis^ 54 



Transverse diameter of posterior articular face 41 



Length of ninth cervical vertebi'a 64 



Transverse diameter of posterior articular face ^^ 63 



Length of humerus 337 



Length of radius 245 



Length of ulna 260 



Length of femur 565 



Length of tibia 5.55 



The known remains of this species indicate an animal about S or 10 feet in 

 height and herbivorous in habit. All the specimens discovered are from tlie 

 Atlantosaurus beds of the Upper Jurassic. 



Concerning the status of the material upon which the above genus 

 and species was founded, Dr. R. S. Lull writes me as follows : " I 

 find an old manuscript sheet in Marsh's writing in which No. 1877 is 

 called the " type " of C. dispar. Professor Schuchert and I have de- 

 cided therefore that 1877 should be the holotype and 1878 the para- 

 type.'' No. 1877r/ mav pertain to the holotype, but, as shown later, 

 appears to represent a distinct individual. ' 



