CONTENTS OP VOL. II. 



PAGE 



CHAPTER XV. PHORONIDEA. By K. HEIDEII . 1 



I. Embryonic development . . . ... 1 



The Actinotrocha larva . . f> 



II. Metamorphosis . . . ... 5 



Rise of the organs . . . ... 8 



III. General considerations . . . ... 8 



Literature . . . . ... 10 



CHAPTER XVI. BRYOZOA ECTOPROCTA. By K. HEIDEII . . 12 



Systematic . . . . ... 12 



I. Formation of the egg, fertilisation, position of the embiyo . .13 



II. Embryonic development . . . ... 15 



General account of the form of the larva . . 17 



III. Metamorphosis . . . . 18 



1. Type which develops an alimentary canal . . .19 



a. Larva of Alcyonidium . . . 19 



b. Larva of Tendra . . . 21 



c. Larva of Membrauipora (Cyphonautes) and Flustrella . 21 



2. Type of the intestineless Chilostomatons larva with slightly 



developed corona . . ... 24 



3. Type of the intestineless Chilostomatous larva with highly 



developed corona . . ... 25 



a. Structure of the larva . . ... 25 



b. Metamorphosis . . ... 27 



4. Type of the Vesiciilarian larva . . 31 



5. Type of the Cyclostomatous larva . . 31 



6. Type of the Phylactolaematous larva . . 32 



IV. Development of the polypide . . ... 37 

 V. Asexual reproduction of the Ectoprocta . . 44 



A. Budding . . . ... 44 



B. Development of Statoblasts . . ... 49 



C. Winter buds (hibernacula) . . ... 54 

 VI. Regeneration . . . . ... 55 



VII. General considerations . . . ... 55 



Literature . . . . ... 60 



CHAPTER XVII. BRACHIOPODA. By K. HEIDER . . 65 



I. Testicardines . . . . ... 65 



A. Embryonic development . . ... 65 



B. Metamorphosis . . . ... 68 



II. Ecardines . . . . ... 73 



III. Changes in the shape of the shell . . ... 75 



