New Series, No. 226 (Vol. 57, Part 2). Price 10s. net. 
Subscription per volume' (of 4 parts) 40s. net. 
NOVEMBEK, 1911. 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
ED1TKI) BY 
Sir RAY LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
H 41 NO HA It t KKI.I.OW'ir KXKTKK COI.1.RGK, OXKOIll) ! 
MEMBER OR THK INSTITUTE OR FRANCK (aSSoCiL fiTRANGER DB- I.’a'C ADEMIE DES SCIENCES) ; 
CORRESPONDENT OK TIIK IMPKRIAI. ACADEMY OK SCIENCES OP ST. PETERSBURG, AND OR THE 
ACADEMY OK SCIENCES OK P II II. A 1) K I. P II I A , AND OK THE ROYAI. ACADEMY OK SCIENCES 
OK TURIN; FOREIGN MEMBER OK THK ROYAL SOCIETY OK SCIENCES OK 
GOTTINGEN, AND OF TIIK ROYAL BOHEMIAN SOCIETY OK SCIENCES, AND 
OK THK ACADEMY OK TIIK LINCKI OK ROME, AND OF THK AMERICAN 
ACADEMY OK ARTS AND SCIENCES OK BOSTON I ASSOCIATE OK THE 
ROYAL ACADEMY OK BELGIUM. HONORARY MKMERR oK TUB 
NEW YORK ACADEMY OK SCIENCES, AND OK THK 
CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OK 
THE ROYAL PHYSICAL SOCIETY OK EDIN- 
BURGH, AND OK THK 
BIOLOGICAL SOCIETY OK PARIS, AND OK TIIK CALIFORNIA ACADEMY OK SCIENCES OK SAN FRANCISCO, AND 
OK THK ROYAL ZOOLOGICAL AND M A L ACOl.OGIC A L SOCIETY OK BELGIUM) 
CORRESPONDING MEMBER OK THE SKNKENBEKG ACADEMY OK FR AN KFURT - A‘ M 
FOREIGN ASSOCIATE OK THK NATIONAL ACADEMY OK SCIENCES. U.S., AND MEMBER OK THE 
AMERICAN PHILOSOPHICAL SOCIETY; 
HONORARY FELLOW OK THK ROYAL SOCIETY OK EDINBURGH". 
LATE DIRECTOR OK THE NATURAL HISTORY DEPARTMENTS OK THK BRITISH MUSEUM; LATE PRESIDENT OF THE 
BRITISH ASSOCIATION FOR THE ADVANCEMENT OP SCIENCE. - LATE KUI. 1. BRIAN PROFESSOR OK 
PH Y8IOI.OGY IN TIIK ROYAL I N STIT UTI ON O F G R E AT R R IT A I N I 
LATE LINACRK PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW i>K MERTON COLLEGE , OX FO H D ; 
EMERITUS PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN UNIVERSITY COLLEGE. UNIVERSITY OF LONDON. 
WITH THE CO-OPERATION OF 
ADAM SEDGWICK, M.A., F.R.S., 
FELLOW OF TRINITY COLLEGE, CAMBRIDGE. AND PROFESSOR OF ZOOLOGY IN THE IMPERIAL COLI.EGE OF 
SCIENCE AND TECHNOLOGY, LONDON; 
SYDNEY" J. HICKSON, M.A., F.R.S., 
BEYER PROFESSOR OF ZOOLOGY IN THK UNIVERSITY OF MANCHESTER; 
E. A. MINCHIN, M.A., F.R.S., 
PROFESSOR OF PROTOZOOLOGY IN THE UNIVERSITY OK LONDON; 
AND 
GILBERT C. BOURNE, M.A., D.Sc., F.R.S., 
LINACRE PROFESSOR OF COMPARATIVE ANATOMY, AND FELLOW OF MERTON COLLEGE, OXFORD. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
J. & A. CHURCHILL 
LONDON. 
7 GREAT MAKLBOliOUGH STREET. 
1911. 
Adlard and Son, Impr.,] 
[London and Dorking 
