CONTENTS. XI 



PAGE 



Castle, W. E. — Role of Selection in Evolution 450 



OsBORN, H. F. — Fundamental Biological Laic 453 



KoPACZEWSKi, W. — Toxicity of Serum of Murxna helena 453 



Pearl, Raymond — The Selection Problem 454 



Clekc, A., & BoBRiE — Digital MalfoniiatioH 455 



Retterer, Ed. — Changes in Shin with Age 455 



Davenport, C. B. — Evolution Theory in the Light of Genetics 573 



McCoRD, Carey Pratt, & Floyd P. Allen — Pineal Gland and Pigmentation .. 573 



Cole, William H., & Carletox F. Dean — Beactions of Tadpoles to Light .. .. 574 



Loyoi.EY.W. H..— Colour-changes of Eeef-Fishes 574 



Sheehy, Edmond J. — Abnormality in Arterial System of Rabbit 575 



VlALLETON, L. — Pectoral Girdle of Tetrapod Vertebrates 575 



Prince, E. E. — Striped Haddoch in New Brunswick 575 



INVERTEBRATA. 



Mollusca. 

 Johnson, Charles W. — New England Molluscs 455 



G, Cephalcpoda. 



ViVANTi, Anna — Spermatophores of New Cephalopod 113 



Goldsmith, Makie — Sensory Reactions of Cuttlefish 385 



Sasaki, Madoka — Notes on Cephalopods 575 



CuENOT, L. — Sepia officinalis 576 



y. Gastropoda. 



Renouf, L. P. W. — Two Generations of Nudibranchs in the Year 113 



ScHiTZ, Victor — Spermatogenesis in Columbella 211 



Baldasseroni, V. — Float of ianthina 211 



Hedlky, Chables— 3/oHw«ca/rom Elevated Marine Beds of McMurdo Sound .. . . 291 



Arcy, L. B. — Migration of Retinal Pigment in Planorbis 456 



Heath, Harold — Structure of an Eolid 456 



Colton, Harold S. — Varieties of Dog-whelk 456 



Heath, Harold — Nervous Si/stem of Crepidula and its Development 457 



Ey ASS, W., & W.E.liyAifS— Scottish Nudibranchs 457 



Massey, Annie L. — Gymno&omatous Pieropods of Coasts of Ireland 576 



Gould, Harley N. — Sex-cycle in Crepidula 576 



,. „ — Influence of Environment on Sex of Crepidula .. ,. .. 577 



5. Lamellibranchiata. 



Anthony, R. — Entovalva 211 



Ghosh, Ekendranath — Structure of Solen 212 



Morris, Margaret — Artificial Parthenogenesis in Cumingia 291 



Heilbrunn, L. V. — Maturation and Development in Cumingia Egg 291 



Churchill, E. P., Jun. — Absorption of Nutriment from Solution by Mussels .. .. 292 



