TABLE OF CONTENTS. XI 



Page. 

 Structure and anatomy Continued. 



Axial organ 



Central organ 



Cirrus nerves 



Bracliial nerves 325 



Nerves of the division series 325 



Finer structure of the brachial nerves 



Branching of the axial cord in the arms 



Wandering cells 



Ventral nervous system 



Innervation of the tentacles 



Neurilemma 



Epithelial nerves 



Physiology of the crinoidal nervous system 



Interbrachial muscles 336 



Epithelial muscles 330 



Ligaments 339 



Ligaments in the cirri 342 



Water-vascular system __. 342 



Blood-vascular system 345 



Labial plexus and spongy organ 347 



Schizoccele cavities 348 



Ciliated epithelium of the ambulacra! grooves.- _ 350 



Ciliated sacks 350 



Ambulacral mucus cells.- 351 



Sacculi 351 



Tentacle papillse 355 



Porsal glands 356 



Brachial and pinnule cysts of Antedon. - 357 



Genital cord 358 



Cement secreting cells 358 



Genital pores of the male 359 



Sperms togenesis and the spermatozoa 360 



Genital organs of Isometra vivipara 365 



Genital organs of Notocrinus virilis 367 



Marsujnum 368 



Sexual differentiation 369 



Spawning season 369 



Comatella nigra ._ 369 



Comissia spanoschistum 369 



Comissia littoralis 370 



Comactinia meridionalis '. 370 



Comanthus japonica 370 



Comanthus anuulata 371 



Catoptometra ophiura 371 



Aruphimetra spectabilis 371 



Amphimetra parilis 371 



Cenometra deltcata 371 



Tropiometra maerodiscus 371 



Tropiometra picta 371 



Calyptometra lateralis 371 



Antedon bifida^_ 371 



Autedon inediterranea 373 



Antedon adriatica__ 373 



