CONTENTS. XI 



PAGE 



Latent Period in the Muscles of Helix Part 6 870 



Affinities of Onchidia „ 870 



Dimorphism of the Spermatozoa in Paludina „ 871 



Mode of Action of Shell- and Rock-horing Molluscs ., .. ,, 872 



Action of Sea Water on Molluscs „ 873 



Molluscoida. 



Ugg and Egg-membranes of Tunicata , . . . . Part 2 213 



Simple Ascidians of the Bay of Naples „ 214 



Urnatella gracilis, a Fresh-water Polyzoan „ 214 



Structure and Development of Argiope „ 215 



Development of Salpa Part 3 368 



Budding of Anchmia „ 369 



Morphology of Flustramemhranaceo-truncata „ 371 



Anatomy of Rhopalaea Part 4 552 



Simple and Compound Ascidians Part 5 731 



Digestion in Salpa , 732 



Fresh-water Bryozoa „ 732 



Supposed New Species of Cristatella „ 733 



Segmentation of Ascidians Part 6 873 



Relation of the Nervous System of the Adult Ascidian to 



that of the Tailed Larval „ 874 



Segmentation of Simple Ascidians „ 875 



Development of Social Ascidians „ 875 



Tunicata of the ' Triton ' „ 878 



Organization of Anchinia „ 878 



Closure of the Cyclostomatous Bryozoa „ 879 



Arthropoda. 



Aspects of the Body in Vertebrates and Arthropods .. , , Part 6 866 

 a. Insecta, 



Respiratory Centre of Insects Part 1 40 



Ghordotonal Sense-organs and the Hearing of Insects . . , . „ 41 



Number of Segments in the Head of Winged Insects .... „ 43 



Protective Device employed by a Glamopid Caterpillar ., „ 44 



Formation of Honeycomb „ 44 



Mouth-organs of Rhynchota „ 45 



Development of Genital Organs of Insects „ 45 



Genital Ducts of Insects , „ 46 



Thoracic Musculature of Insects „ 47 



Early Developmental Stages of Viviparous Aphides .... „ 47 



Chlorophyll in Aphides „ 48 



Genealogy of Insects Part 2 217 



Development of Antennm in hisects „ 218 



Experiments with the AntenncB of Insects „ 218 



Epidermal Glands of Caterpillars and Malachius ,. .. „ 219 



Classification of Orthoptera and Neuroptera „ 220 



Sucking Organs of Flies , 220 



Visceral Nervous System of Feriplaneta orientalis .. . . „ 223 



