1897.] 



AITATOMX OF PHAETHOBT. 



289 



could find no aftershaft ; there are 12 rectrices ; the poUex is clawed. 

 The bird is aquincobital. 



The anatomy of the soft parts of this bird has been briefly touched 

 upon by Brandt in the memoir already cited, where the tongue, 

 palate, and larynx are figured. The presence of two carotid 

 arteries, the muscular formula of the leg, and one or two other 

 miascles have been referred to by Garrod \ I am not aware, however, 

 to what species these notes refer, and, as will be seen presently, 

 specific differences are apparently marked iu the internal organs. 



The specimen of the bird which I dissected had had the intestines 

 removed. I find, however, from a MS. note of Garrod that the 

 intestines of an individual dissected by him were Sg feet long, the 

 large intestine only | inch, and the cseca " buttons. " The left 

 lobe of the liA'^er is the smaller, and there is a gall-bladder. 



The Pecf oralis jorimus was not \evj markedly two-layered. Mr. 

 Forbes found a specimen dissected by himself (? species) to have a 

 single-layered pectoralis. It has the second insertion on to the 

 flat common Biceps tendon found in so many Steganopodes. I 

 found no Pectoralis abdominalis. 



Kg- 1. 



COf 



Origin of Biceps in Pelecamis (left-hand figure) and Phalacrocorax (right-hand 

 figure). (After Fiirbringer.) 



Cor., Coracoid ; 0, coracoidal head of Biceps ; A, attachment of humeral 

 head to Humerus ; B, its prolongation to Coracoid. 



The Biceps (fig. 1) is fashioned like that of Phalacrocorax, 

 not like that of Pelecamis and still less like the Biceps of Sula 

 and Fregata ; the humeral head in fact is a narrowish tendon 

 attached to but still distinct from (by reason of its greater 

 thickness) the wide thin tendon which is the coracoidal head 

 of the muscle ; the former has also, as shown in the drawing 

 (fig. 1, A), a short special tendinous attachment to the head 

 of the humerus. The muscular slip to the patagium (Biceps slip) 

 arises from the humeral head of the Biceps. 



The Patagialis muscle in part performs the function of a deltoid ; 



1 " On certain Muscles in the Thigh of Birds &c.," P. Z. S. 1873, p. 628 &c. 

 " Notes on the Anatomy oi Plotvs anhinga," P. Z. S. 1876, p. 335 &c. 



Pkoc. Zool. Soc— 1897, No. XIX. 19 



