CONTENTS. XVH 



Bryozoa. 



PAQK 



Okada, Yaichiro — Cyclostoniatous Bryozoa of Japan 390 



Echinoderma. 



Packard, Charles — Effect of Radium Radiations on Rate of Cell-division in 



Arbacia 128 



MiLLiGAN, H. N. — Food of Sea-urchin 128 



Gemmill, J. F. — Development of Asteroids 225 



Newth, H. ft. — Early Development of Cucumnria 226 



Herlant, M. — Action of Oxazine on Germ-cells of Sea-urchin 226 



LiLLiE, Ralph S. — Division of Sea-urchin Ova 303 



„ „ Permeability and Activation of Sea-urchin Egijs 396 



Herlaxt, M. — Increase in Volume of the Nucleus of the Activated Ovum .. .. i70 



Flsher, W. K. — New Family of Asteroids 470 



Clark, Austin H. — Revision of Genera of Bouryuetricinidx 471 



DoDERLEix, L. — Genus Astropecten 591 



Ccelentera. 



^VASS, yVii.— Firth of Forth Coekntera 128 



Cart, L. — Sense-organs and Regeneration in Cassiopea 129 



Parker, G. N. — Neuromuscular Arrangements in Sea-Anemones 129 



MiLLiGAN, H. N. — Sagartia parasitica Moujiting Shells 130 



Bedot, M. — Genus Kir chenpaueria 226 



Broch, Hjalmar — Northern Hydroids 227 



BiGELOW, H. M. — Neio Genus of Trachomedusse 227 



Matthews, Annie — Development of Alcyonium digitatum 227 



HiCESON, Sydney J. — Monograph on Pennatulacea 228 



Parker, E. Newton — Luminescence of Cavernularia 304 



Parker, G. H. — Nervous Transmission iii Actinians 304 



,. Movements of Tentacles in Actinians 305 



„ Pedal Locomotion in Actinians 305 



LoEB, Jacques, & Hardolph Wasteneys — Heliotropism in Eudendrium .. .. 306 



Parker, G. H., & E. G. Titus — Structure of Metridium 397 



Parker, G. H. — Effector Systems of Actinians 398 



Badham, C. — Larval Actinian Parasitic in Rhizostome 398 



Child, C. M. — Conducting Paths in Ctenophores 399 



Sanchez y Sanchez, Manuel — Minute Structure of Actinians 471 



Dehorne, Yvonne — Senonian Stromatoporella 471 



Eoskine, G. — Epithelio-muscular Cells of Hydra 471 



Bedot, M. — Genus Antenella 591 



Thomson, J. Stuart — South African Gorgonacea 591 



Porifera. 



Dendy, Arthur— GeZa^HiOMS Spicules in a New Genus of Siliceous Sponges .. .. 131 



Gravier, Ch. J. — Animals Associated with a Sponge .. 306 



Hallman, E. F. — Axinellid Sponges , .. 307 



Annandale, Nelson, & Tamiji Kawamura — Sponges of Lake Biwa ., . . . , 307 

 Dec. 19th, 1917 h 



