OF FROGS OF THE GEXUS BIIEVICEPS. 405 



between these members of the same genus. On the other hand, 

 I am able to confirm certain structural features of the genus as 

 formerly described by myself by finding an identical arrangement 

 in these examples of B. gihbosns. 



§ Genito-urhiary Organs. 



The testes, fat-hodies, and hidneys of Brevicejys gihhosus do not 

 altogether agi-ee in their chai-acters with my former description. 



There is no doubt that the vasa etferentia of the testes are 

 numerous, as is the general rule among the Anura. This fact I 

 am clear about. So obvious are the several parallel sperm-ducts 

 issiung from each testis, that I cannot understand how I can 

 have been in error in describing only a single duct in the smaller 

 species of Breviceps, if, that is to say, I was in error. Moreover, 

 in Brevicej^s gibbosus the ureter arises from the lower corner of 

 the kidney, and not from rather higher up as I have figured it in 

 Breviceps sp.* The two kidneys are nowhere fused together in 

 the middle line. It is woi^th recording that the fat-bodies have 

 but few finger-like processes ; I found two and three in one 

 specimen and three and four in another. But these structures 

 are known to vary. 



§ Respiratory Organs. 



The lungs of Brevicejis gibbosus pi-esent several features of 

 interest. Each lung itself (in the contracted condition in which 

 it appears in the alcohol pr-eserved specimens) is broader at the 

 base and narrows towards the free abdominal extremity. It is 

 important to notice that both extremities of the lung are free and 

 that the bronchus enters that organ at about the second third of 

 its entire length. The lung is thus not merely a sac dependent 

 from a rudimentary trachea. Furthermore, two bronchi are very 

 plainly difi'erentiated. Each is, in fact, about half as long as the 

 lung (contracted, of course) into which it opens. It is proportion- 

 ately wide and enters the lung at right angles to the long axis of 

 the latter viscus. Its walls are membranous and translucent and 

 I could detect no cartilages. The pulmonary ligament fixing the 

 lung to the dorsal middle line extends along the whole of the 

 bronchus and just on to the lung. 



If I have not in any way misread the conditions which obtain 

 in the species of Breviceps t dissected three years since, that 

 species shows considerable difierences from Breviceps gibbosus in 

 the relations of the cesojihago-jnilmonary inx^scle [^'^ diaphragm"). 

 There are, however, also points of agreement between the two sets 

 of individuals. For instance, the muscle arises in both in the 

 same way from a vertebral ti'ans verse process nearly in common 

 Avith the transverso-scapularis. Furthermore, in both cases the 



* P. Z. S. 1908, p. 38, text-fig". 13. 



t Ijoc. cit. p. 27, and text-tig-. 7, p. 28. 



Piioc. ZooL. Soc— 1911 , No. XXVII. 27 



