698 EEFOET— 1897. 



Flagellation is readily oljserved in both forms, the organism in freshly prepared 

 slides being seen to burst from the corpuscle and almost immediately throw out 

 flagella. Other organisms extruded from the corpuscle degenerate without 

 flagellation. 



The tissues of these birds show characteristic changes, resulting from the 

 destruction of blood corpuscles and the deposition of pigment. The spleen and 

 liver are the organs most markedly affected, the pigment being taken up along 

 with infected corpuscles, shrunken parasites, and other debris by large niakro- 

 phages, wliich probably originate from endothelial cells. These occur in the 

 capillaries and small vessels in these organs. The endothelial cells still attached 

 to the vessel wall are also sometimes SNvollen and crowded with pigment, &c. In 

 the spleen the large endothelial cells of the pulp bands take on the characters of 

 makrophages. The leucocytes are only exceptionally xjhagocytic. 



The pigment is partly formed by the organisms, partly the result of the 

 breaking down of the biemoglobin set free in the blood on tlie rupture of the 

 corpuscle, and there are corresponding variations in its colour. 



The other organs, including the bone marrow, are in general very slightly 

 affected. Certain foci of necrosis which occur in vai-ious organs have not as yet been 

 definitely associated with the presence of these organisms. 



9. The Post-embryonic Development o/" Aspidogaster conchicola. 

 By Joseph Stafford, Ph.D. 



The author, after mentioning the ways in which this animal differs in form, 

 structure, development, and life history from other Trematodes, and the conse- 

 quent difficulties in classifying it, gave a brief sketch of the origin of the embryo, 

 and then turned in detail to the life of the young animal after it leaves the e^§, 

 during all the time it is undergoing a change in form and developing new organs 

 until it reaches sexual maturity. 



Its morphological transformations were represented by eight drawings made to 

 the same scale, and its anatomical structure was represented by a few transverse 

 sections of each stage. The first of these is the just liberated embryo, which now 

 begins to live a free life, and is accordingly, following the suggestion of Brown, 

 called a Miracidium. The lengths of the animal at these different periods are 

 0'16, 0-33, 0-45, 0'8, 1, 1'2, r5 mm. The change in external form was described, 

 and then the origin and change in structure of each organ until it has reached 

 maturity were discussed. 



10. On a ]M7-tieularIy large Set of Antlers of the Red Deer 

 (Cervus elaphus). By G. P. Hughes. 



1 1 . On the Evolution of the Domestic Baces of Cattle, with jyarticular Refer- 

 ence to the History of the Durhatn Short Horn. By Q. P. Hughes. 



