NATURAL SCIENCES OE PHILADELPHIA. 129 



on each side. This has raised edges and terminates above in the 

 longitudinal surface for the neural arch, having thus a T _s l ia P e - 

 It narrows below to an obtuse point, and no doubt supported a 

 free diapoplrysis. 



The fragments of the pelvic and scapular arches indicate that 

 they were eapacious. The clavicle inclosed a large foramen, was 

 rather narrow, and thickened on the inner edge. Its glenoid 

 surface was wide and sub-rhomboid. Some of the other bones 

 were quite thin. 



MEASUREMENTS. 



M. 



Length of anterior cervical 0.062 



Depth articular face do .050 



"Width of articular face do. ' .050 



Length of posterior cervical .070 



Depth articular face do .052 



Width " " 090 



Distance between parapophysi .048 



Length anterior dorsal .059 



Depth articular face do .062 



Width " " 072 



" neural canal on centrum . . . . .017 



Long diameter proximal end clavicle . . .114 



Associated with these remains were those of a turtle of the 

 size of some of the large Gheloniidse of recent seas. The only por- 

 tions were the scapulo-procoracoid, the coracoid, and the mandible 

 nearly complete. The two former were like those of Ghelydra; 

 the procoracoid issuing nearly at the articular extremity, and the 

 coracoid being of moderate elongation and much expanded dis- 

 tally, and with nearly straight axis. The mandibular rami were 

 remarkably slender and Avith correspondingly short symphysis. 

 The tomia obtuse and directed outwards, the apex flat and obtuse. 

 Coronoid process slightly elevated ; articular bone osseous. 

 Length coracoid .250 m. ; diameter distally .080 ; distal width of 

 scapula .058; length ramus of mandible .150; length symphysis 

 .030. 



The general characters of this form were thought to agree with 

 Cynocercus, Cope, though the individual was larger than that 

 on which the G. incisus was established. 



