OUR KNOWLEDGE OF NEVY ZEALAND HOLOTHURIANS. 125 



Plate 14, 



Figs. 21-29. Mhabdomolgiis novcB-zeulandice, 



Fig. 21. Transverse section of the radial nerve whilst on the pharynx, (x 225.) 



ep. = i-adial epineural space ; ex.n. — external band of the radial nerve ; 

 li%jp. = radial hyponeural space ; in.n. ■= internal band of radial nerve ; n.c. — 

 nerye-cells ; sep. — septum of connective tissue between the inner and outer 

 bands of the radial nerve. 

 Fig. 22. Transverse section of radial region of the bodj'-wall after the disappearance of the 

 radial nerve, (x 225.) 



cav. = radial cavity ; c.e. = columnar epithelium ; c.l. = connective-tissue 

 layer ; c,?n. = circular muscle-layer ; (/. = ganglion, from which radiate the 

 nerves of the sense-papilla ; (/I. = gland-cell ; Ijn. = longitudinal muscle-band ; 

 n.l. = nerve-layer*; n.p. — nerve supplying the ganglion ff-; p. = sense-papilla; 

 per. = peritoneal layer ; s.n. = superficial layer of nerve-fibres beneath the 

 epithelium. 

 Fig. 23. Transverse section (somewhat oblique) through the calcareous ring, &c. (x 55.) 

 c.r. = calcareous ring ; l.7n. = longitudinal muscle-band ; ot. = otocyst ; 

 ph. = pharyngeal wall ; 7-.n. — radial nerve ; t.c. = diverticulum of tentacular 

 canal. 

 Fig. 24. Transverse section of the madreporic canal, (x 250.) 



c.e. = endothelium of columnar cells (probably ciliated) ; c.t. — connective- 

 tissue layer ; mes. — mesentery ; per. — peritoneal layer. 

 Fig. 25. Ciliated funnel from the dorsal mesentery, (x 300.) 



/. = funnel ; st. = stalk. 

 Fig. 26. Funnel from a longitudinal muscle-band showing two large cells (? ova) escaping 

 from the mouth, (x 250.) 



e, = large nucleated cells, filling the funnel; oi;. = large cells escaping from 

 the funnel ; st. = stalk. 

 Fig. 27. Transverse section of an open ciliated funnel from the dorsal mesentery. ( x 300.) 



c.c. — ciliated columnar cells ; p.c. = cellular contents. 

 Fig. 28. Transverse section of a closed funnel from a longitudinal muscle-band. 



(X300.) 

 Fig. 29. Transverse section of another funnel from a longitudinal muscle-band. 

 (X300.) 



Figs. 30 «-30 c. Chirodota geminifera, n, sp. 



Fig. 30 a. Sigmoid spicules showing some variations of shape. ( x 280.) 



Fig. 30 b. A young pair of sigmoid spicules. ( X 280.) 



Fig. 30 c. An older pair of sigmoid spicules, partially fused, (x 280.) 



* The dotted line has been accidentally omitted ; the nerve-layer lies just outside the 

 layer of circular muscles, but is not distinctly shown. 



LINN. JODRN.— ZOOLOGY, VOL. XXX. 10 



