Page:Synopsis of the Exinct Batrachia and Reptilia of North America. Part 1..pdf/82

76 THE EXTINCT BATBACH1A, REPTILIA It is in the third a short acute transverse crest truncate in front, gradually inclined behind ; fourth, a similar crest curved into a crescent quite as in Leidy's plate* above cited under T. obscurus. In the fifth they are two weak elevations, much less marked than in the above in my possession. All the above exhibit a well marked constriction between the parapophyses and the rim of the cup. The dorsals with hypapophyses are distinguished by the less cordate form of the articular cups, they being relatively broader below. and in the second to fifth, narrower above than in the T. cordatus. Their neural arches have on the inner faces a ridge constricting the neural canal slightly. The hypapophysis of the two-fifths in my possession are rather short, broad and obtuse. The eervieals may also be known by their strong posterior shoulder, and constriction of the body behind the Para popbyses, where the width enters the length (exclusive of ball) twice : the relation is 1:1.5 in T. neocacsariensis. The parapophyses are most abruptly tuned out, and are directed downwards, thus embracing a median concavity which is divided by a rather narrow earina. Separated from the rim of the cnp by a narrow transverse plane, a hypa-pophysial elevation extends transversely between positions in front of the parapophyses: this is less elevated medially than exteriorly, the latter position being marked by a prominent angle. The articular cup of the first dorsal is a slightly transverse oval. The lumbar vertebrae exhibit little to distinguish them from those of other species. An anterior caudal is more depressed than that from near the same position in T. brevispinis. The cup is broader than high, and the inferior plane broad and concave. ,Measurements. Fifth cervical ; total length, length to shoulder, width of neural canal, between ends diapophyses, In. 2 2, Lin.. 9. 1.5 9. 8.5 64 44 " parapophyses, lateral depth of body in front, median iC ••1 1 1 9.• 9. 8. depth articular cnp. 1 4. Sc (4 1 4.75 Seventh dorsal ; total length, length to shoulder, width neural canal, depth anteriorly, with hypapophysis. 1 1 10.5 6.2,• 11.5 width of cup, depth " i 1 0.75 6.25 Posterior dorsal ; length to shoulder, vertical diameter cup, 24.25 20.75 transverse 19. The mandible preserved, indicates an animal of considerable size. Estimated according to the proportions of existing Gavials its length would have been :— In. Head, 28.70 Body, 92.85 Tail, 09.64 Total, Ft., 15 ; In., 11.19 Length of inaudible preserved, symphysis, splenial in front of fork, IT, eg. 4. •