THE OCCiriTAL REGTOX OF THE HEAD IX BATRACHIA URODELA. 1 01 



a. hybrid. Grouse vary considerably in their colouring from very 

 dark to cream-colour. I do not personally contend that this bird 

 is a hybrid ; in my opinion it is a Grouse, and I show it this 

 evening as a curious variety of the colouiing of the ordinary 

 Red Grouse." 



Other zoologists present confirmed Dr. Hammond Smith's 

 opinion that the bird was not a hybrid. 



Mr. D. Seth-Smixh, F.Z.S., Curator of Birds, exhibited some 

 slans of the Austi-alian Yellow-rumped Finch {Mnvia Jiavi- 

 prymna). These birds had been kept alive in an outdoor aviary 

 in England, and had developed certain markings tending towards 

 those of another closely allied species, Mtmia castaneithorax. 

 The exhibitor attributed this to the fact that the former species 

 was a desert fox'm of the latter, and when placed in a, humid 

 environment tended to revert to the plumage of the lattei-. He 

 referred to a paper he had published on this subject in the 

 ' Avicultural Magazine,' 1907, p. 195. 



Dr. W. E. HoYLE, M.A., F.Z.S., English Member of the Inter- 

 national Commission on Zoological Nomenclature, explained the 

 Report presented to the Graz Meeting of the International 

 Zoological Congress, and referred in particular to the proposals 

 made for the protection of well knoAvn zoological names. 



A discussion followed on the portion relating .to the formation 

 of an Official List of most frequently used Zoological ISTames. The 

 feeling of the Meeting was very strongly in favour of the Inter- 

 national Congress giving its authority to the forming of a List of 

 Zoological Names, the significance of which should not be altered 

 by application of the rules of the International Code. It was 

 Tinanimously agreed to accept the action of the Congress if it 

 would adopt this course. 



PAPERS. 



8. On the Segmentation of the Occipital Region of the Head 

 in the Batrachia Urodela. By Edwin S. Goodrich. 

 M.A., F.R.S., F.Z.S., Fellow of Merton College, Oxford. 



[Received November 29, 1910 : Read December 13, 1910.] 

 (Text-figures 29-51.) 



rutroduGiion. 



It is now well known that in the Craniata Gnnthostomata the 

 region of the head lying behind the auditory capsule is a, 

 compound structure, formed of a number of segments -jriginally 



