SHTJFELDT : OSTEOLOGY OF THE STEGANOPODES 175 



and down the shaft, back and front, also slightly differ, as does the form of the 

 hypotarsus in a lesser degree. 



The skeletal plan of the pea in Phalacrocorax essentially agrees with what we 

 found in the Anhingidse. We are to note the great length of the basal joint of 

 hallux, and for its entire continuity, how muchjthe shaft of the bone is bowed. 



Mr. Frederic A. Lucas, Curator of the Department of Comparative Anatomy 

 in the U. S. National Museum, in describing some of the bones of P. perspidllaius 

 in the Proceedings of that institution for 1899 (Vol. XII., p. 88), remarked that he 

 had the following material upon which to base his studies, and which had been 

 collected by Dr. Leonard Stejneger on Bering Island in 1882. 



" Rostral portion of cranium in " Right fused metacarpals, very im 



advance of the fronto-nasal hinge, with perfect, 

 attached palatines. " Three pelves, lacking pubic bones. 



" Lower mandible. " Left femur. 



" Right ramus of lower mandible. " Two left tibiae. 



"Two nearly complete sterna. " Right tibia. 



" Right coracoid. " Two left tarsi. 



" Right humerus. " Second cervical vertebra. 



"Left humerus of another individual. " Third cervical vertebra. 



" Right ulna. " Ninth (?) cervical vertebra. 



" Right fused metacarpals. 



" The more important of these are figured on the accompanying plates, all figures 

 being of natural size, and drawn by the author. 



" The bones, although stained, are in a good state of preservation, being but 

 slightly weathered, and all are from thoroughly adult individuals. 



"For a better and briefer description of these bones they have been compared 

 with those of an adult Phalacrocorax carbo, and the opportunity has been taken to 

 test, to some extent, the value of the subgenera Urile and Phalacrocorax, by com- 

 paring at the same time the corresponding bones of P. urile and P. dilophus. 



"The former bird is, for the species, large and the latter somewhat undersized, 

 although adult. 



" The rostrum of perspidllatus is nearly as long as in carbo, but much more 

 slender, and is readily distinguished from it by the deep, lateral, longitudinal 

 groove characteristic of the subgenus Urile. 



"The under surface of the rostrum is less grooved, longitudinally, than that of 

 carbo and much less so than that of P. urile (see PI. XXIV., Figs. 13-21, and PI. 

 VI., Figs. 25-28). 



