19-1 C. W. Gil more — New Species of Baptanodon. 



appears to have the same number of segments (14) as found in 



the other members of this genus. It has been removed from 



the orbital cavity and as viewed antero-posteriorly it might be 



Avell described as the union of the bases of two truncated 



cones. This specimen fully confirms a previous suggestion of 



the writer* "that this covering extended well to the back of 



the eyeball as in some birds." The diameter of the internal 



opening equals that of the external pupillary opening. The 



ring is about 70 mm in thickness, and compared with the eye of 



B. discus is small in diameter, as is clearly indicated by the 



following measurements : 



Greatest Diameter Diameter 



length of of 



of sclerotic pupillary 



skull. ring. opening. 



B. discus, No. 878, Carnegie Museum 1082 ram 202 mm 100 mm 

 B. reedi, D. B., University of Wyo. 1320" 150 "f 85" 



That part of the rostrum studied by the writer measures 

 262 mm in length, and, as in the other Baptanodon skulls, the 

 tip of the beak is wanting. The frail nature of the bone, 

 together with the exceedingly refractory matrix, did not admit 

 of the preparation of this part of the specimen, but a longitu- 

 dinal fracture exposes the dental groove of one side, in which 

 may be counted the bases of thirteen teeth. 



These teeth are of a strong, robust nature with enlarged 

 bases. The few teeth protruding from the matrix are subcir- 

 cular in cross-section, their surfaces being covered with coarse 

 longitudinal stride which gradually subside before reaching the 

 subacute apex, which is smooth. Mr. Reed informs me that 

 large teeth are present in the grooves of the posterior portion 

 of the rostrum. It would seem, therefore, from this evidence 

 that Baptanodon reedi had a series of strong functional teeth 

 extending from the back to the front of the jaws. 



Mr. Reed furnishes the following information concerning 

 the vertebral series : 



" The vertebrae of this specimen number one hundred and 

 fifty-three. There are four centra missing, namely, the atlas, axis, 

 third and fourth cervicals, but their neural processes are retained 

 in place, and these parts resemble the homologous elements of 

 Baptanodon marshi. The diapophysial articular surface on the 

 fifth centrum (counting from the skull) of the series is confluent 

 with the neurapophysial articular surface, and this position 

 holds until the eighteenth centrum is reached. On this vertebra 

 the two surfaces are separated. From this point posteriorly the 

 diapophyses and parapophyses gradually move down on the 



* C. W. Gilmore, Memoirs Carnegie Museum, vol. ii, No. 9, p. 328. 

 f If flattened out like the sclerotic ring of No. 878 this dimension would 

 he about 175 mm . 



