Geological Papers. 129 



inner side back of the middle and not far from the margin. Be- 

 cause of this position and absence of any distinct sutures, I believe 

 that the bone is the coracoid only, and that the scapula was a sepa- 

 rately ossified bone. An outline of the bone in its relative size is 

 shown in plate 2. 



The clavicular girdle, found with its parts in nearly perfect re- 

 lations, the outer side of the right clavicle only missing, is remark- 

 able for its large size. The three bones together form a gently 

 concave trough, nearly straight in the middle antero- posteriorly. 

 All the bones show on their outer surface the characteristic pitting 

 of tho skull, with their margins thinned and delicately grooved ra- 

 dially. A stout process from the clavicle on each side is directed 

 inward and upward, and somewhat backward, perhaps for attach- 

 ment to the yet undiscovered scapula. A figure of the united 

 bones from below is shown in plate 2; and the outline of the three 

 with the attached coracoid in plate 4. The rather stout humerus 

 has its two extremities twisted at an angle of about forty-five de- 

 grees. The proximal extremity (plate 3) is transversely expanded 

 and of moderate thickness, without tuberosity of any kind; indeed 

 until the discovery of the epicondylar foramen I was disposed to 

 consider this the distal extremity, though rather puzzled to account 

 for the transposition of the right humerus attached to the skull 

 apparently in immediate connection with the pectoral girdle. The 

 distal extremity has a much greater expansion and thickening. 

 Distally and laterally there is a well-defined canal piercing the 

 bone obliquely, evidence for which is corroborated in other speci- 

 mens from Orlando. The presence of an epicondylar foramen has 

 usually been considered as characteristic of the reptiles and want- 

 ing in the amphibians, though Cope expressly mentions such a 

 foramen in Ackeioma, a Texas tetnnospondyle. From the oppo- 

 site side a narrow but high ridge ascends the bone obliquely about 

 half way toward the opposite side, extending nearly to the ex- 

 tremity as an elevated ridge. The shape of the bone in different 

 aspects will be well understood by reference to the figures made 

 from a well-preserved specimen of small size from the Orlando 

 beds. 



Of the femora the best preserved is one from specimen No. 651 ; 

 various others from Texas and Orlando agree well with it. The 

 bone is much more slender than the humerus, with the proximal 

 and distal expansions subequal and but moderate in extent. On 

 the posterior side there is a high but thin oblique crest, occupying 

 about three-fifths the length of the bone, and reaching neither ex- 

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