THE NERVOUS SYSTEM OF ANTEDON ROSACEUS. 297 



DESCRIPTION OF PLATE XIV, 



The figures are diagrammatic, and are intended merely to show the 

 position and relations of the nervous system ; the other systems being 

 omitted, either wholly or in part. The nervous system is coloured 

 black in all three figures. In figures 1 and 3, I have borrowed ideas 

 from figures given by Ludwig (' Morphologische Studien ') : all the 

 figures are, however, constructed from camera drawings of my own 

 preparations, and the two mentioned will be found to differ in some 

 important points from the corresponding ones of Ludwig. 



Alphabetical List of References. 

 a. Axial cord. b. Branches of axial cord. c. Branches of axial 

 cord to pinnule, d. Central capsule, e. Branches from central capsule 

 to cirri. /. Chambered organ, g. Central plexus, h. Subepithelial 

 band (ambulacral nerve). *. Ambulacral groove, h. Tentacle. I. Am- 

 bulacral canal, m. Subtentacular canal, n. Cceliac canal, o. Pin- 

 nule, p. Cirri. r. Mouth. s. Intestine. t. Ciliated openings 

 in body-wall. u. Muscle. CD. Centrodorsal plate. R. Bosette. 

 Rl First Badial. R. 2 . Second Badial. R 3 . Third Badial. Br v First 

 Brachial. Br 2 . Second Brachial. 



Fig. 1. Diagrammatic vertical section through the disc and base of 

 one of the arms of Antedon rosaceus, showing the relations 

 of the central capsule, axial cords, and subepithelial bands. 

 The section is interradial, i.e. passes between two pairs of 

 arms, on the left side, radial on the right. 

 Fig. 2. Transverse section of an arm of Antedon rosaceus, passing on 

 the right side through the base of one of the pinnules. 

 The figure is diagrammatic as regards the branches of the 

 axial cord, which are filled in from a considerable number 

 of sections. 

 Fig. 3. Diagrammatic plan of the central capsule and its branches in 

 Antedon rosaceus. 



