YELLOW-BROWN CELLS OF CONVOLUTA PARADOXA. 481 
The Yellow-Brown Cells of Convoluta 
paradoxa. 
By 
Frederick Keeble, Sc.BD., 
Dean of the Faculty of Science and Professor of Botany in University 
College, Reading. 
With Plates 26—28, 3 Text-figures, and 2 Tables. 
Y/ CoNTENTS. 
PAGE 
Section I.—Inrropucrion . ° : f 5 asi 
Section I].—Tnz Bionomics or C. PARADOXA . 432 
(2) The Paradoxa Zone : . 432 
(6) Migrations—Tropisms : . 434 
(c) Periodicity of Egg-laying . 440 
(zd) The Eggs and Larve ; . 442 
(e) Ingestion of Solid Food ; . 443 
Section IIJ.—Tur Yriitow-sprown CELLs ; . 445 
(a) Description : . 445 
(4) Photosynthetic Activity 2 . 447 
(c) Reserve Fat a‘ ‘ . 449 
(dq) Fate. 5 5 Bp) 
(e) Origin . i : . 456 
(/) Nature . i 3 . 463 
(g) Significance : : . 464 
Section 1V.—GENERAL Conclusions . 3 . 473 
TABLES 1}, 2 5 ; : : . 475—476 
LITERATURE ; : ; : a ATT 
EXPLANATION OF PLATES ; : ; . 478 
Section I].—IntTROpDUCTION. 
Convoluta paradoxa (=C. convoluta, Auct.) is a 
small brown accelous Turbellarian which lives among the sea- 
weeds of the shore. The characteristic colour of the animal 
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