PROCEEDINGS 
OF 
THE ROYAL SOCIETY. 

“Series B. Vol. 76. = No. BSu. 
BIOLOGICAL SCIENCES. 
CONTENTS. 
. : _ Page 
On the Occurrence of Certain Ciliated Infusoria within the Eggs of a Rotifer, 
considered from the Point of View of Heterogenesis. By H.CHARLTON 
BASTIAN, M.A., M.D., F.R.S. (Abstract.) (Plate 7). ; . 385 
The Morphology of the Ungulate Placenta, particularly the Development of 
that Organ in the Sheep, and Notes upon the Placenta of the Elephant 
and Hyrax. By RICHARD ASSHETON, M.A., Lecturer on Biology in 
the Medical School of Guy’s Hospital, University of London. (Abstract) 393 
Contributions to the Physiology of Mammalian Reproduction. Part I—The 
; CEstrous Cycle in the Dog. Part I]——The Ovary as an Organ of 
‘Internal Secretion. By FRANCIS H. A. MARSHALL, Carnegie Fellow 
in the University of Edinburgh ; and WILLIAM A. JOLLY, Assistant to 
the Professor of Physiology in the University of Edinburgh. (Abstract). 395 
Chitin in the Carapace of Pterygotus osiliensis, from the Silurian Rocks of 
Oesel. By OTTO ROSENHEIM, Ph.D. . 398 
On a New Species of Cephalodiscus (C. nigrescens) from the Antarctic Ocean. 
By E. RAY LANKESTER, M.A., D.Sc. LL.D., F.R.S., Director of the 
Natural History Departments of the British Museum. (Plate 8). . . 400 
Experimental Researches in Vegetable Assimilation and Respiration. [V.—A 
Quantitative Study of Carbon-Dioxide Assimilation and Leaf-Temperature 
in Natural Illumination. By F. FROST BLACKMAN, D.Sc., Fellow of 
St. John’s College, Reader in Botany in the University of Cambridge, and 
GABRIELLE L. C. MATTHAEI, Fellow of Newnham College : . 402 
Note on the Mechanics of the Ascent of Sap in Trees. By Professor 
J. LARMOR, Sec. R.S. . : j i ; : : : : . 460 
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