New Series, No. 184 (Vol. 46, Part 4). 



FEBRIIAEY, 1903. 

 THE 



Price 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



EDITKI) HY 



E. RAY LANKESTEK, M.A., LL.D., E.R.S., 



SOKABV FELLOW OP EXETER COLLEGE , OXPOB D ; COH B ESPONDK > T OK THE INSTITUTE OK PBAXCI 



AND OK TUB IMPEBIAL ACADEMY OK SCIENCES OK ST. PETERSBURG, AND OK THE ACADKMV 



OK SCIENCES OK PUILADELPIIIA ; KORKIGN MEUBBR OK TUE BO»AL BOHEMIAN 



SOCIETY OK SCIENCES, AND OK TUE ACADEMY OK THE LINCEI OK BOMB, 



AND OK TUK AMERICAN ACADEMY OK ARTS AND SCIENCES OK BOSTON : 



ASSOCIATE OK THE ROYAL ACADEMY OK BELGIUM; HONORARY MEMBER 



UK THE NEW YORK ACADEMY OK SCIENCES, AND OK THE 



CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OK THE ROYAL 



PHYSICAL SOCIETY OP EUINBUBOH ; HONORARY 



MEMBER OK THE BIOLOGICAL SOCIETY 



OK Paris; 



DIRECTOR OP TUB NATURAL HISTORY DEPARTMENTS OK THE BRITISH MUSEUM; LATE KULLERIAN 

 PBOKBSSOR OK PHYSIOLOGY IN THE ROYAL INSTITUTION OK GREAT BRITAIN. 



WITH THE CO-OPERATION OF 



ADAM SEDGWICK, M.A., F.R.S., 



KELLOW AND TUTOR OK TRINITY COLLEGE, CAMBRIDGE; 



W. F. E. WELDON, M.A., F.R.S., 



LINACHE PROFESSOR OF COMPARATIVE ANATOMY AND KELLOW OK MEUTON COLLEGE, OXFORD: 



LATE KELLOW OF ST. JOHN's COLLEGE, CAMBRIDGE; 



AND 



SYDNEY J. HICKSON, M.A., F.R.S., 



BEYER PROtKSSOU OP ZOOLOGY IN THE OWENS COLLEGE, MANCHESTER. 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON: 



J. & A. CHURCHILL, 7. GREAT MARLBOROUGH STREET. 



1903. 



Adliird and .Son,] 



[London and Dorkinc 



