CONTENTS. 
CONTENTS OF No. CXXIX, N.S., DECEMBER, 1891. 
MEMOIRS: 
PAGE 
Some Problems of Reproduction : a Comparative Study of Gameto- 
geny and Protoplasmic Senescence and Rejuvenescence. By 
Marcus M. Harrtoe, M.A., D.Sc., F.L.S., Professor of Natural 
History in the Queen’s College, Cork . : : : 1 
On Wandering Cells in Echinoderms, &c., more especially with 
regard to Excretory Functions. By Hrrserr HE. Durnam, 
M.A., King’s College, Cambridge, and Guy’s ee London. 
(With Plate I) .. ; : : Pe: 
On the Nature of the Excretory Processes in Marine Polyzoa. 
By Srpney F, Harmer, M.A., B.Sc., Fellow and Assistant 
Tutor of King’s College, Cambridge. (With Plates Il and III) 123 
Spermatogenesisin Myxine glutinosa. By J.T. Cunyinenam, 
M.A., Naturalist on the Staff of the Laboratory of the Marine 
Biological Association, Plymouth. (With PlateIV) . . 169 
Notes on some Aquatic Oligocheta. By W. Buaxtanp Brennan, 
D.Se.Lond., Aldrichian Demonstrator of Comparative Anatomy, 
Oxford. (With Plates V, VI, and VII) : : : 187 
On the Differentiation of Leprosy and Tubercle Bacilli. = 
Cuarzes Stater, M.B.Cantab. . F : 219 
On a Specimen of the True Teeth of Ornithorhynchus. + Pro- 
fessor CHARLES STEWART, P.L.S. (With Plate VIII). wooed 
b 
