6 



PROCEEDINGS OF THE jS^ATIONAL MUSEUM 



VOL. 73 



opposed to cotylosaurian affinities, as Williston states that " the pec- 

 toral girdle [in the Cotylosauria] is almost invariably found lying 

 immediately back of the skull, the front end of the interclavicle, 

 indeed, between the angle of the jaws." If this is true, I would 



favor an assignment to the 

 Theromorj)ha on account of 

 the longer neck. 



Fore foot. — The natural 

 molds of a group of small 

 disarticulated bones on the 

 left side of the skeleton and 

 clear of the rib ends are 

 regarded as being the ele- 

 ments of the left fore foot. 

 (See fig. 3, F. F.) Two of 

 the longest of these are 

 thought to be metacarpal 

 bones (see fig. 3, mc.) ; the 

 longest has a greatest length 

 of 10 mm., the other 9.4 mm. 

 The molds of some smaller 

 bones lying anterior to the 

 metacarpals may represent 

 carpal bones, but I have 

 been unable to identify any 

 of them. Obscure indica- 

 tions show the presence of 

 phalangeal elements, includ- 

 ing one slightlj'^ curved, 

 pointed, ungual phalanx that 

 has a greatest length of 5.5 

 mm. The preservation is 

 such that I have been unable 

 to positively identify the 

 pro[)er articulated relation- 

 ships of any of these scattered bones. One of the metacarpal bones 

 has a wide shaft with expanded extremities, while the longest has a 

 shaft that is subcircular in cross-section. 



Fig. 3. — Hypsognathus fenneri^ new species. 

 Type, Cat. No. 11643, U.S.N.M. Outline op 

 skeleton as found in the rock. About 



ONB-IIALF natural SIZEl F. F., ELEMENTS OF 

 LEFT FORE FOOT ; H, PROXIMAL END OF HU- 

 MERUS ; mc, METACARPALS ; R, RIBS ; Ra, 



RAMI ; S, SCAPULAE ; V, VERTEBRAE ; X, UN- 

 IDENTIFIED BONK 



DISCUSSION OF RELATIONSHIPS 



In the absence of the skull and other diagnostic parts of the skele- 

 ton no satisfactory conclusion has been reached concerning the family 

 and other relationships of the specimen under consideration. The 

 presence of holocephalous ribs, deeply aniphicoelous vertebrae, den- 

 tary of unusual height with receding chin, and mandible greatly 



