New Series, No. 216 (Vol. 54, Part 4). Price lOs. net. 
Subscription per volume (of 4 parts) 40s. net. 
FEBRUAEY, 1910. 
THl^ 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE. 
KDIIKI* HY 
Sje ray LANKESTER, K.C.B., M.A., D.Sc., LL.D., F.R.S., 
HONUHAUT KKI.1.0W UK KXKTBU C U I.l. BO K . U X KO K I) ; C U U K KS P UX UK X T UK TUB IXSTtTliTK OK KHANCE« 
AXU OK TUK IMPKRIAI. ACAUKMY OK 9CIKNCKS OK 8T. PKTKURBirUG, AXU UK TUB ACAUK.MY 
UK SCIKXCK8 UK P M I I.A il K I.P 11 1 A , AND OK THE KOYAl. ACADEMY OF SCIKNCBS 
OK TUKIn; KUKKIGN MBHBRU ok TUK ROYAI. SOCIETY OK SCIENCES OK 
GOTTINGKN, and UK THE KUYAI. BOHEMIAN SOCIETY <'K SCIKNCKS, AND 
OK TUK ACADEMY OF TUB MNCKl OK IIUMB, AND OK TUK AMKUirAN 
ACADEMY OK AKTS AND SCIENCES OK BOSTON ; ASSOCIATK OK TUK 
ROYAl. ACADKMY OK BBl.GItlM; HONORARY MEMBKK OK TUK 
NKW YORK ACADEMY UK SCIKNCKS, AND OK THE 
CAMHKIDGK P il I I.OSOP II I C A I. SOCIETY, AND OP 
THE UOYAI. PIIYSICAI. 80CIKTY UK EDIN* 
BIIRGII, AND OK TUK 
BlUf.OGICAL SOCIKTY OK PARIS. AND OF TUK CAI.IFOKMA ACADEMY J F 8CIKNCE.S OK SAN KKANCISCO. AND 
OK TUK ROYAl. ZOOI.OGICAI. AND MAt.ACOI.OGlCAl. SOCIKTY OF BELGIUM; 
CORRKSPUNDING MEMBER OF THE SRNKKNBEKG ACADKMY OP K R AN K FU RT*A- M ; 
FUKKIGN ASSOCIATK OF TUK NATIONAL ACADKMY OF SCIENCES. U.8.. AND MEMBER UK TUB 
AMERICAN rilll.OSOPIIlCAI. SOCIEl Y ; 
HONORARY KELLOW OF THE ROYAL SOCIETY OF EDINBURGH; 
LATE lilllRrtOH OK TUK NAtl'RAL IliSTUllY DRPARTMKNTS OK THE BRITISH MUSKUM : LATE PRRSIDENT OF THE 
BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE.’ l.ATK Kt'l.LKKIAN PUUKKS80R OF 
FIIYSIULOGY IN THE ROYAL INSTITUTION OF QRRAT BRITAIN ; 
l.ATK MNACRK FROFKRSOR OF COMKAHATIVE ANATOMY AND FEM-OW op MERTON C O LLF GE , O X FO R l> . 
EMERITUS PROFESSOR OF ZOOLOGY AND COMPARATIVE AXATOMY IN UNIVERSITY COLIEGE. UNIVERSITY OK LONDON 
WITH THK CO-OPEUATION OP 
ADAM SEDGWICK, M.A., F.R.S., 
FELLOW OK TRINITY COLLEGE. CAMBRIDGE. AND PROFESSOR OK ZOOLOGY IN TUB IMPERIAL COLLEGE OK 
SCIENCE AND IBCUNOLOOY, LONDON. 
SYDNEY J. HICKSON, M.A., F.R.S., 
BKTRR PKOKRSSOK OK ZOOLOGY IN TUK UNIVERSITY OK MANCMKsrKR; 
AND 
E. A. MINCHIN, M.A., 
PKOKESSOn OK PROT OZOOLOGY IN TUB UNIVERSITY OK LONDON. 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES 
LONDON. 
& A. OHUllOHlLL, 7 GEEAT MAKLBOROUGH STREET. 
1910. 
Adlanl and Son, Impr.,] 
[London and Dorkin] 
