CONTENTS. 
V 
CONTENTS OP No. LXXIX, N.S., JULY, 1880. 
MEMOIRS : 
PAGE 
On the Structure and Homologies of the Germinal Layers of 
the Embryo. By F. M. Balfour, M.A., F.R.S., Fellow 
of Trinity College, Cambridge .... 247 
Hubrecht’s Researches on the Nervous System of Nemertines. 
(With Plate XXIII) . . . . ^ . .274 
On the Structure of the Nephridia of the Medicinal Leech. 
By A. G. Bourne, Assistant in the Zoological Laboratory 
of University College, London. (With Plates XXIV and 
XXV) 283 
On Intra-Epithelial Capillaries in the Integument of the Me- 
dicinal Leech. By E. Ray Lankester, M.A., F.R.S., Pro- 
fessor of Zoology in University College, London. (With 
Plate XXVI) 303 
On the Connective and Vasifactive Tissues of the Medicinal 
Leech, By E. Ray Lankester, M.A., F.R.S., Professor 
of Zoology and Comparative Anatomy in University College, 
London. (With Plates XXVII & XXVIII) . . 307 
On the Use of the Wenham Binocular with High Powers. By 
Heneage Gibbes, M.B. ..... 318 
On the Structure of the Human Spermatozoon. By Heneage 
Gibbes, M.B. ...... 320 
Some Disputed Points in Echinoderm Morphology. By P. 
Herbert Carpenter, M.A., Assistant Master at Eton 
College ....... 322 
The Origin of the Red Blood-Corpuscles. By Professor Pouchet, 
of the Jardin des Plantes, Paris . . ... 331 
On Limnocodium (Craspedacustes) Sower biiy a New Tracho- 
medusa inhabiting Fresh Water. By E. Ray Lankester, 
M.A., F.R.S. (With Plates XXX and XXXI) . . 351 
NOTES AND MEMORANDA : 
On the Development of the Structure known as the ‘ Glome- 
rulus of the Head-Kidney’ in the Chick. By Adam Sedg- 
wick, B.A. . . , . . . .372 
Bacterium anthracis ...... 374 
Dr. Carl Rabl on the Pedicle of Invagination in Pulmonate 
Gastropoda ....... 376 
Development of Muscular Tissue from Epiblast in the Mammalia 377 
PROCEEDINGS OF SOCIETIES : 
Dublin Microscopical Club ..... 378 
