380 S. W. WILLISTON 



a tuberculiform parapophysis, but does not have a diapophysis 

 on the side of the prezygapophysis, and hence must be considered 

 a true cervical. 



A second connected series of cervicals, of somewhat larger size, 

 includes three elongated vertebrae, of nearly equal length. I can- 

 not distinguish the posterior two from the anterior two of the pre- 

 ceding series, and the first of this series is scarcely different, save 

 in having a little more pronounced spine on the posterior half of 

 the arch rising directly above the level of the zygapophyses. The 

 two series thus fix the number at not less than seven, four of which 

 are much elongated, and the fifth only a little less so. This, 

 however, does not preclude the possibility of a larger number of 

 vertebrae in the neck. Among the free cervical vertebrae are four 

 elongated ones of adult size, one of which is shown in Fig. 4, E, 

 F, G. There are also several others like these, but of smaller size, 

 one of which is shown in Fig. 4, C. They all have rudimentary 

 spines, very thin, short, and low. In some, there is a very small 

 cartilaginous surface on the upper margin. The cervical vertebrae 

 were originally described by me as caudals, but the error was imme- 

 diately recognized when the connected series were prepared. 



Dorsals. — In the three specimens shown in Figs, i and 2 the 

 dorsal series of vertebrae are complete and connected except that 

 a few have been dislodged in the specimen presented in Fig. 2, A. 

 Unfortunately in all three specimens the matrix has been removed 

 from the ventral side, and it would be a matter of much difficulty 

 now to clean the dorsal side and thus to determine the transition 

 from the cervicals to the dorsals. Inasmuch as in two of these 

 specimens the scapulae lie in relation to the nineteenth or twentieth 

 presacrals, that number may be accepted as almost certain for the 

 dorsal series. 



Several other series of dorsal vertebrae showing the dorsal 

 side have been prepared. A part of one of these series is shown 

 in Fig. 4, Q, from above; and two isolated dorsal vertebrae are 

 shown in Fig. 4, N, P, together with a more posterior one, a lumbar, 

 in Fig. 4, O. The dorsals, as seen from below, are all rather slender; 

 from above they appear less so, because of the overhanging arch. 

 The centra are all more or less obtusely keeled below. An anterior 



