XVI CONTENTS. 



PAGE 



New Rotifers Part 6 893 



Observations on Rotifera (^Melicerta) „ 894 



Echinodermata. 



Sexual Dimorphism in Echinoderms Parti 51 



New Echinoidea Part 2 251 



Perivisceral Fluid of the Echinoidea „ 251 



Pedicellarice and Muscles of Sea- Urchin „ 253 



New Asteroidea „ 254 



Structural Feature, hitherto unknown among Echinoder- 

 mata, found in Deep-sea OpMurans ,, 254 



Arctic Echinodermata Part 3 463 



Echinoidea of the ^ Gazelle' Expedition „ 464 



Locomotor System of Echinodermata „ 464 



Circulatory and Respiratory Organs of the OpMuroidea .. „ 466 



Stomach and Genital Organs of Astrophytidm „ 466 



Preliminary List of the known Genera and Species of Living 



Ophiurida; and Astrophytida; „ 467 



Echinoderms from the North Sea Part 4 605 



Echinodermata of the Straits of Magellan „ 605 



Nervous System of the OpMuroidea „ 606 



Viviparous Chirodota „ 606 



Echinodermata of the Gulf of Triest Part 5 743 



Revision of the Holothuroida „ 743 



Observations on the Echinoidea „ 744 



Crossaster ,, 745 



Echinoidea of the ' Challenger ' Expedition Part 6 895 



Morphology of the Sur-Anal Plate ,, 896 



Comatulce of the Leyden Museum ,, 896 



Coelenterata. 



Diverse Nervous Susceptibilities of Lower Organisms .. .. Part 1 52 



Rising and Sinking of Beroe ^ 54 



Zoantharia of the Gulf of Marseilles ^^ 55 



Structure of Corals and Sea-anemones „ (32 



Structure of Cladocoryne ^^ 63 



Early Stages of Renilla Part 2 255 



Development of Campanularia angulata ,, 256 



Development of the Ova of Eiidendrium ^^ 256 



Nervous System of the Siphonophora Part 3 468 



Colouring Matter of Medusm 468 



Australian Distichopora ^^ 47O 



Observations on Hydroid Polyps , 47O 



Formation of Ova in Eudendrium , 47O 



Organization and Classification of the Acraspedota .. .. Part 4 608 



The Discomedusai 609 



Origin of the Ovum of the Hydroida Part 5 746 



American Acalephos 746 



Jelly-fishes of Narragansett Bay 746 



JEquorea Forskalea 747 



