STEGANOPODES 



405 



Sulct and Pelecanus a slender tendon, running from the arm- 

 pit and ending in un striated (Sula) or striated (Pelecanus} 

 fibres for the movement of the secondary feathers, was dis- 

 covered. 



The biccys is two-headed in the Steganopodes ; but the 

 arrangement differs from what is common among birds. 

 Both heads, in fact, arise from the coracoid, but the outer 

 one, which corresponds to the humeral head of other birds, is 

 also attached to the humerus. The two muscular bellies are 

 separate in Pelecanus and Fregata, and their tendons unite 



COR. 



COR 



FIG. 190. ORIGIN OF BICEPS IN Pelecanus (LEFT-HAND 

 FIGURE) AND Phalacrocorax (AFTER FURBRINGER) . 



'.'('/-, corncoM ; C, coracoidal head of biceps ; A, attachment of humeral 

 B, its prolongation to coracoid. 



to divide again directly. In Fregata, indeed, the division of 

 the tendon of the coracoidal head takes place before the 

 junction. In Phalacrocorax africanus I found the coracoid 

 head alone, and it had but one insertion. In Phaeton and 

 Phalacrocorax and Sula the tendons of origin of the two 

 heads from the coracoid are continuous. In Phalacrocorax 

 and Plotus, at any rate, the anconaus has a humeral head. 



The muscles of the leg vary greatly among the Stegano- 

 podes. The following are the formulae for the different 



genera :- 



Phaeton AXY- 1 

 Plotus AX + 



Pelecanus AX 



S/ila AX + 



PJialacrocorax \ 

 Fregata A + . 



f ABX + - 

 1 AX + 



1 Perhaps the ambiens varies. GAKROD, FORBES, and I did not find it. 

 FCRBRINGER marks it as present, as does GADOW. 



- ABX P. carto? AX P. lur/ubris, P. brasilicnsis. 



