xiv CONTENTS. 



PAGE 



Endodcrmnl Nervous System in IJydroids Part 3 376 



Development of the Tentacles of Hydra „ 377 



Preserving the Fresh-water Medusa. {Fig. 90) . . . . Part 4 485 



Structure of Hydroid Polyps „ 513 



Development of Hydra „ 514 



Alternation of Generations in Hydro-medusae „ 515 



Hydro-ynedusa: without Digestive Organs , 516 



Phylogeny of the Siphonop)ho7-a „ 516 



Embryonic Tentacular Knobs of certain Physophores ., „ 518 



Blue Colouring Matter of Phizostoma „ 518 



Symbiosis of Br yozoa and Actinia: Part 5 635 



Ccelentcrates of the Southern Seas „ 663 



Observations on Medusa: „ 664 



Rcjyroduction of Hydroid Polyps „ 665 



New Hydroid Polyp „ 666 



Hard Structures of the Fungiidce „ 666 



Ccelentcrates of the Southern Seas Part 6 850 



New Medusce from the Eed Sea „ 852 



Development of Obelia „ 853 



American Anthozoa „ 854 



Hard Structures of the FungiidcB „ 854 



Elevated Coral Beefs of Cuba „ 854 



Polymorphism of Alcyonaria „ 855 



Ciliated Groove (^Siphonoglyphe') in the Stomodccum of the 



Alcyonarians „ 855 



Porifera. 



Vosmaer's Porifera Part 3 378 



Fresh-water Sponges of Pussia „ 378 



Fungus Parasitic on Sponges „ 393 



Australian AplysinidcB Part 4 519 



Ovum of Marine Sponges Part 5 667 



New British Sponge „ 668 



Vital Manifestations of the Sponges Part 6 856 



Spermatogenesis in Sycandra „ 857 



Fresh-water Sponges of Bohemia „ 858 



Bavarian Fresh-water Sponge „ 860 



African Fresh-water Sponges „ 860 



Protozoa. 



Suctociliata, a New Group of Infusoria, intei-mediate between 



the Ciliata and the Acinetina Part 1 75 



New Infusorian belonging to the Genus Pyxicola . . , , „ 77 



Systematic Position of Amphidinium „ 77 



Evolution of the Peridinina , „ 77 



New Thuricola „ 78 



Flagellata „ 79 



Microsporidiw or Psorospermia: of Articulates „ 79 



Development of Gregarinx and Coccidia ,, 80 



GregarinidiC of Annelids „ 81 



Intestinal Parasites of the Oyster „ 81 



Perception of Light and Colour by the lowest Organisms .. „ 81 



