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5. W. WILLISTON 



more anterior ones, were first determined by Professor Case.^ 

 Dr. Huene completed our knowledge of the anterior ones, and Dr. 

 Broom has corroborated the most of them. The most striking 

 peculiarity of the skull is seen in the large size and posterior exten- 

 sion of the lacrimal. 



The figure of the clavicular girdle is made from one of the 

 numerous isolated specimens agreeing closely with that attached 

 to the first-mentioned skull. Its comparison with that of Cacops^ 



Fig. 5. — Trimerorhachis. A, right interclavicle, from behind; B, right scapula, 

 from without; C, the same, from within; D, scapula of a smaller individual or species; 

 E, fragment of another scapula; F, humerus; G, H, radii; I, occipital condyle from 

 laehind; exo, exoccipital; /, the same bone from in front; K, the same from below; 

 L, ulna. All figures three-fourths natural size. 



will show the extraordinary differences from the more terrestrial 

 type of the contemporary temnospondyl amphibians. The scapula 

 is also very peculiar in its short, rounded shape. The thickened 

 part on its front border is apparently for articulation with the 

 ascending process of the clavicle (Fig. 5, C). The foramen is the 

 supraglenoid. The bone agrees closely with that figured by Case 



' Carnegie Publication, No. 146, {1911) pp. 107 ff., A, B. 



^ Bulletin American Geological Society, XXI, Plate II, Fig. i. 



