1883.] PROF. OWEN ON GENERAL HOMOLOGY. 349 



name " nationi ' ' for this species if it were to be retained in the 

 genus Buarremon. 



Mr. Selater called the attention of the Meeting to a Condor from 

 Peril, which had been presented to the Society by Mr. John I. North, 

 on the 13th June, 1877, and which was still living in the 

 Society's Gardens. After six years it was in nearly the same uniform 

 brown plumage as that in which it had been originally received, and 

 which at that time had led Mr. Selater to suppose it to be the young 

 of the Common Condor (Sarcorhamphus grijphus). Mr. Selater had 

 now come to the conclusion that this must be a sjiecimen of the 

 " Condor ijardo,'^ or Brown Condor, spoken of by Mr. J. Orton\ 

 and subsequently named Sarcorhamphus cequatorialis by Sharpe in 

 his ' Catalogue of Birds in the British Museum' (i. p. 21). 



Mr. Selater exhibited a water-colour drawing of this curious bird 

 (Plate XXXV.), and pointed out that it differed from the Common 

 Condor in its smaller size, nearly uniform brown plumage, and brown 

 ruff. The example in the Gardens had no caruncle on the head, 

 and was perhaps a female bird, as the specimen seen at Amsterdam 

 by Mr. Sharpe was stated to have a perfectly formed erectile wattle. 



Mr. G. French Angas exhibited a collection of Butterflies from 

 Dominica, West Indies, made during a seven weeks' residence in that 

 island in February and March last. 



The following papers were read : — 



1. Embryological Testimony to General Homology. 

 By Prof. Owen, C.B., F.R.S., F.Z.S., &c. 



[Eeceived April 18, 1883.] 



In my researches on the ' Archetype of the Vertebrate Skeleton '^ I 

 was led to regard the limbs, severally, as an appendage of a haemal 

 arch, diverging therefrom with a free termination. In the majority 

 of these appendages their distal end does not push through the 

 integument : this condition is represented by the " pleural spines " in 

 Fishes {op. cit. pi. ii. fig. 2, a, a), and by the " costal appendages " 

 in Crocodiles (ib. fig. 3, a, a) and Birds (ib. fig. 4, a, a). The only 

 appendicular elements of the vertebral segment which do push 

 through and undergo diverse degrees of adaptive developments, as 

 " limbs," are those in which such development may be traced from 

 the primitive form in Lepidosiren and Protopterus (ib. fig. 7, «) to 

 that of the many-rayed and jointed diverging appendage of the 

 scapulararch,or "pectoral fin," in other Fishes, and of the varied forms 

 and modifications of the fore and hind limbs in higher Vertebrates. 



^ ' The Andes and tlie Amazon,' by James Orton, 3rd ed., Kew York, 1870. 

 p. 565. 

 * 8vo, 1848, pp. 72, 101. 



Proc. Zool. Soc— 1883, No. XXIV. 24 



