CONTENTS. V 



PAGE 



Notes on Common Species of Troclius. By H. J. Fleure and 

 Muriel M. Gettings, University College, Aberystwyth. (With 

 Plate 28) . . . . .459 



Note on the Formation of the Skeleton in the Madreporaria. 

 By Maria M. Ogilvje Gordon, D.Sc.(London), Ph.D. (Munich), 

 F.L.S. . . . . . .473 



Studies in Spicule Formation. VII, — The Scleroblastic Develop- 

 ment of the Plate-and-Anchor Spicules of Synapta, and of the 

 Wheel Spicules of the Aurioularia Larva. By W. Woodland, 

 The Zoological Laboratory, King's College, London. (With 

 Plates 29 and 30, and G Text-figures) . . . 483 



CONTENTS OF No. 204, N.S., NOVEMBER, 1907. 

 MEMOIRS : 



The Development of the Head-muscles in Gallus domesticus, 

 and the Morphology of the Head-muscles in the Sauropsida. 

 By F. H. Edgewortii, M.B., D.Sc, Professor of Medicine, 

 University College, Bristol. (With 39 Text-figures) . . 511 



The Development of Ophiothrix fragilis. By E. W. Mac- 

 Bride, M.A., D.Sc, F.R.S,, Professor of Zoology in McGill 

 University, Montreal. (With Plates 31—36, and 4 Text-figures) 557 



On the Segmentation of the Head of Diplopoda. By Margaret 

 Robinson, University College, London. (With Plate 37, and 

 6 Text-figures) . . . . .607 



The Fixation of the Cypris Larva of Sacculina carcini 

 (Thompson) upon its Host, Carcinus msenas. By Geoffrey 

 Smith, M.A., New College, Oxford. (With 6 Text-figures) . 625 



Physiological Degeneration in Opal in a. By C.Clifford Dobell, 

 B.A., Scholar of Trinity College, Cambridge. (With Plate 38, 

 and 2 Text-figures) ..... 633 



Some Facts in the Later Development of the Frog, Rana tempo- 

 raria. Part I. — The Segments of the Occipital Region of the 

 Skull. By Agnes I. M. Elliot, B.Sc, Associate of Newnham 

 College, Cambridge. (With Plates 39 and 40) . . 647 



Title, Index, and Contents. 



VOL. 51, PART 4. NEW SERIES. 



