386 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Meastircments. 



M. 



Length of ungual phalange 0.185 



Vertical proximal depth ...„ 0.058 



Vertical depth at middle of inferior tendinous tuberosity 0.055 



Vertical depth just beyond inferior tuberosity , 0.044 



Width of proximal cotylus 0.052 



Width of unguis at middle 0.033 



Width of unguis near end 0.020 



Length of penultimate phalange 0.065 



Depth of penultimate across condyles 0.040 



Width of penultimate across condyles 0.033 



Depth of proximal end 0.052 



In size, this species equallefl the M. Imrlani or the Megalonyx jefer- 

 sonii. 

 From the Pliocene of Oregon. 



Oraculus macropus, sp. nov . 



This cormorant is represented by numerous bones in my collection, 

 of which I select three nearly perfect tarso-metatarsi as representative. 

 One of these is 4°"" longer than the others, and is one-fourth of its 

 length longer than the corresponding bone in the G. dilophus. The 

 shaft is grooved in front deeply for the proximal third, shallowing to 

 and on the remaining portion, with the external margin the more ele- 

 vated, but descending distally. On the posterior face of the shaft there 

 is a median longitudinal angle along the distal half of the length, which 

 curves outward to the inner base of the external trochlea. The hypo- 

 tarsal crest disappears on the inner side of the middle crest, near its 

 proximal extremity. A delicate crest originates at the inner side of the 

 proximal end, and curving backward returns to the inner side at the 

 anterior base of the external trochlea. There is a rough ridge on the 

 inner side of the posterior face of the shaft on its distal third. The 

 borders of the trochlea are prominent, particularly the posterior ex- 

 tremities of those of the median trochlea. There is a median longitud- 

 inal angle on the proximal third of the inner side, and a weaker one on 

 the postero-internal side for the proximal fourth. The four insertions of 

 the flexor tendons of the tarso-metatarsus are distinct. The hypotarsus 

 is not so long as in G. diloplms and G. penicillatus, and terminates ob- 

 tusely. Its length is equal to the anteroposterior diameter of the in- 

 ternal cotylus, whereas it is greater in the two species named. The 

 tendinous canal on their inner side is open and not closed, as in the two 

 species named, and it is as large as the groove at the base of the hypo- 

 tarsus. The external cotylus is a little smaller than the internal, and 

 has a truncate external border ; the external posterior notch is small. 



Measurements m. 



Length, No. 1 0.082 



Width, proximally 0.017 



Width at middle of shaft 0.0095 



