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The pronephros of Scyllium canicula, 
By 
T. H. Burlend, M. A. B. Sc. 
formerly Scholar of Christ’s College, Cambridge. 
(Lecturer in Histology and Embryology at University College, 
Cardiff.) 
With Plates 18—-25 and 7 Figures in the text, 
Contents. 
Introduction. 
Historical. 
Material and Observations. 
Description of the pronephros and its blood-supply in embryos A to K. 
Comparison of the main results with those of RUCKERT, VAN WIJHE 
C. RABL and LAGUESSE. 
Theoretical conclusions reached from a study of the pronephros in the 
Dogfish compared with the existing views. 
Introduction. 
An inquiry into the development of the pronephros in a Che- 
lonian — Chrysemys marginata — has prompted me to inquire into 
the early development of the kidney in a Selachian, Scyllium cani- 
cula. The observations of Rickert and VAN WIJHE are in part de- 
pendent upon theoretical considerations, and have never been satis- 
