110 THE ZOOLOGIST. 
the foliage. The whole phenomenon was comparable to the production 
of honeydew from the Lime by the agency of Aphides. 
Then followed a paper “On the Shell of the Bryozoa,” by Mr. Arthur 
W. Waters. The points he more particularly drew attention to were the 
great difference of the young and old cells, caused by a constant growth of 
shell substance, so that the older zooecia become closed up. This growth 
progresses at various rates. Passing through the shell are tubes filled with 
corpuscles of the chylaqueous fluid, which thus become oxidised. The 
supposed nervous filament of the colonial connection the author believes to 
be rather for the supply of material from one part of the zooarium to 
ancther. He further suggests that the varying thickness of the plates in 
the walls of the colonial connection should be used as a factor in specific 
determination, and especially would it be useful in comparing recent and 
fossil forms. There is a possibility of the avicularia and adventitious tubes 
being homologous, and helping to maintain the vitality of the colony when 
the polypides have disappeared. 
Messrs. A. G. Agar and C. Berjeau were elected Fellows of the Society. 
The President, having put the motion, it was unanimously resolved to 
present an address to Professor C. T. Ernest von Siebold on his approaching 
jubilee.—J. Munir. 
ZooLoeicaL Society oF Lonpon. 
February 5, 1878.—Prof. Mivarr, F.R,S., Vice-President, in the chair. 
The Secretary read a report on the additions that had been made to the 
Society’s Menagerie during the month of January, and called especial 
attention to a Japanese Wild Dog (an animal apparently allied to the 
“ Dhole” of India and the “ Dingo” of Australia), presented by Mr. Harry 
Pryer, of Yokohama, January lst; and to a young Penguin (probably 
Spheniscus Humboldti), purchased January 24th. 
Prof. Mivart read a paper entitled ‘* Notes on the Fins of Elasmobranchs, 
with Considerations on the Nature and Homologies of Vertebrate Limbs,” 
wherein the author detailed his dissections of the fins of Elasmobranchs, 
which dissections had convinced him that the paired and azygos fins are of 
similar nature. He represented them as having all resulted from the 
centripetal growth and evalescence of a primitively distinct series of cartila- 
ginous rays developed in longitudinal folds, of which one was dorsal, one 
ventral, and two were lateral. He also advocated the view that the limb- 
girdles result from the further centripetal growth of the evalescing limb- 
cartilages, which growth seeks’ a point d’appui, the pectoral limb-girdles in 
fishes shooting upwards and downwards as well as inwards to obtain a firm 
support, and, at the same time, to avoid the visceral cavity. He contended 
that the archipterygium was not to be sought for in Ceratodus, which he 
