Page:Synopsis of the Exinct Batrachia and Reptilia of North America. Part 1..pdf/77

 AND AYES OF NORTH AMERICA. 71 Measurements of Vertebra. Of Young. Ira. Lin. Eighth? dorsal ; total length, I 5. length to shoulder, I 1. longitudinal line between zygapophyses, 1 5.• horizontal base of neural spine, 11. depth of neural canal, 4.5 46 articular cup, 9.5 width of " 9.5 neural suture to nearest diapophysis, 3. Third ? lumbar; total length, 1 5. length to shoulder, 1 1. longitud. line between zygapophyses, 1 0. horizontal base of neural spine, 1 depth neural canal, 4.75 " articular cup, 9. width " •‘ 11. First sacral ; length, 1 2.75 anterior width centrum, 1 .75 posterior " 10. depth neural canal, 4.75 " articulation of diapophysis, 11. length 6• if 9. width neural arch between diapophyses, 1 2.5 Anterior caudal ; length, 1 3. to shoulder, 1 1.5 depth neural canal, 4.5 if articular cup, 8. width 8.75 .width inferior plane, 4. Distal caudal ; length, 1 5.5 " to shoulder, 1 3.25 depth cup,* O. width " 5. length base diapophysis, 8.73 None of the vertebra exhibit a constriction of the neural canal by a ridge on each of its sides. as is seen in the H. tenebrosus. This specimen is named from the short longitudinal and vertical extent of its hypapophyses. A right humerus accompanying three vertebrae of the adult, has the same color and mineralization, and was found with them ; it probably belongs to the same animal. Compared with a humerus of H. obscurus of medium size, it is three-fifths the length and has more strongly marked articular faces. The head is more transverse, less rounded, and more strongly divided into the scapular and coracoid faces. The width of the head is one-fourth the length, and reaches the summit of the deltoid crest. This crest is lower down in H. obscnrus. the above width only reaching its proximal base. The anterior face above the crest is concave in H. brevispinis, nearly flat in II obscnrus. There is a moderate internal tuberosity distally, and the condyles are moderately prominent. Coronoid fossa well marked.
 * )Thasuremmts of tits articular cup are always made from middle to middle of the rim.