New Series, No. 228 (Vol. 57, Part 4). Price 10s. net. 
Subscription per volume (of 4 parts) 40s. net. 
APRIL, 1912. 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
KDlThl) HY 
Sir RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
HONORARY FELLOW OF EXETKR COLLEGE AND HONORARY STUDENT OF CHRIST CHURCH, OXFORD; 
MEMBER OF THE INSTITUTE OF FRANCK (aSSOCIE £tRANGER DE I.’aCADEMIE DES SCIENCES) ; 
COHRKSFONDBNT OF TUB 1MPKRJAI. ACADEMY OF SC1KNCKS OP ST. PETERSBURG, AND OF THE 
ACAtlKMY of SCIENCES OF F H 1 1. A D K I.F U I A , AND OF THE ROYAI, ACADEMY OF SCIENCES 
OF TURIN; FOREIGN MKMBKR OF TUB ROYAL SOCIETY OF SCIENCES OF 
GOTTINGEN, AND OF TIIB ROYAL BOHEMIAN SOCIETY OF SCIRNCBS, AND 
OF TBS ACADEMY OF TUB LINCEI OF ROME, AND OF THR AMERICAN 
ACADEMY OF ARTS AND SCIENCES OF BOSTON ! ASSOCIATE OF THE 
ROYAL ACADEMY OF BELGIUM. HONORARY MEMBER UP TUB 
NEW YORK ACADEMY OF SCIENCES, AND OF THE 
CAMBRIDGE P II ILOS O F II ICAL SOCIETY, AND OF 
THE ROYAL PHYSICAL SOCIETY OF EDIN- 
BURGH, AND OF THE 
BIOLOGICAL SOCIETY OF PARIS. AND OF THE CALIFORNIA ACADEMY OF SCIENCES OF SAN FRANCISCO, AND 
OF THE ROYAL ZOOLOGICAL AND MALACOLOGIC AL SOCIETY OF BELGIUM;* 
CORRESPONDING MEMBER OF THE 8KNKENBERG ACADEMY OF F R AN KFU RT 1 A" M J 
FOREIGN ASSOCIATE OF THE NATIONAL ACADEMY OF SCIENCES, U.8., AND MEMBER OF THE 
AMERICAN PHILOSOPHICAL SOCIETY i 
HONORARY FELLOW OF THE ROYAL SOCIETY OF EDINBURGH'. 
LATE DIRECTOR OF THR NATURAL HISTORY DEPARTMENTS OF TIIE BRITISH MUSEUM; I. ATE PRESIDENT OF THE 
BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE.' LATE Fill. 1. BRIAN PROFESSOR OF 
PHYSIOLOGY IN TIIE ROYAL INSTITUTION OF GRRAT BRITAIN i 
LATE LI N AC R E PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE, OXFORD; 
EMERITUS PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN UNIVERSITY COLLEGE, UNIVERSITY OF LO SDON 
WITH THE CO-OPERATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
FELLOW OK TRINITY COLLEGE, CAMBRIDGE, AND PROFESSOR OK ZOOLOGY IN THE IMPERIAL COLLEGE OP 
SCIENCE AND TECHNOLOGY, LONDON; 
SYDNEY" J. HICKSON, M.A., F.R.S., 
BKYRR PROFESSOR OF ZOOLOGY IN T11K UNIVERSITY OF MANCHESTER', 
E. A. MINCHIN, M.A., F.R.S., 
PROFESSOR OF PROTOZOOLOGY IN THE UNIVERSITY OF LONDON; 
AND 
GILBERT C. BOURNE, M.A., D.Sc., F.R.S., 
INaCRK PROFESSOR OF COMPARATIVE ANATOMY, AND FELLOW OF MERTON COLLEGE, OXFORD. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
LONDON. 
J. & A. CHURCHILL, 7 GREAT MARLBOROUGH STREET 
1912. 
Adlard and Son, Impr.,] 
[London and Dorking, 
