CONTENTS OF No. 203.-New Series. 



MEMOIRS : 



PAGE 



The Cbsetognatlia, or Primitive MoUusca. With a Bibliography. By 

 R. T. GuNTHER, F.L.S., F.R.G.S., Tellow of Magdalen College, 

 Oxford. (With 10 Text-figures) . . . .357 



The Structure, Development, and Bionomics of the House-fly, Musca 

 domes tic a, Linn. — Part I. The Anatomy of the Fly. By 

 C. Gordon Hewitt, M.Sc, Lecturer in Economic Zoology, 

 University of Manchester. (With Plates 22—26) . . 395 



Trichomastix serpentis, n.sp. By C. CLiFroRD Dobell, B.A., 

 Scholar of Trinity College, Cambridge. (With Plate 27, and 2 

 Text-figures) . . . . . . 4i9 



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

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

 Plate 28) . . . . • . i59 



Note on the Formation of the Skeleton in the Madreporaria. By 

 Maria M. Ogilvie Gordon, D.Sc.(Loudon), Ph.D.(Munich), 

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



Studies in Sjiicule Formation. VIL — The Scleroblastic Development 

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

 Spicules of the Auricularia Larva. By W. Woodland, The 

 Zoological Laboratory, King's College, Loudon. (With Plates 29 

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



