Notes on the morphology of the Tunicata. 595 



Fig. 11. A sagittal section through the intersiphonal organs of 

 Diasona violacea S a v. X 100 diameters. 



Fig. 12. One of the cells of the neural gland of Ecteinascidia 

 turhinata Herdm. X 1200 diameters. 



Fig. 13. A sagittal section through the intersiphonal organs of 

 Perophora viridis Verrill. X 360 diameters. 



Plate 35. 

 Reference letters. 



a. s. n anterior siphonal nerve r. n rapheal nerve 



h.s blood sinus s in Fig 16 dorsal surface of the 



C.f ciliated funnel (dorsal tubercle) neural gland 



d duct of neural gland t in Fig. 16 ventral surface of the 



d.r dorsal raphe neural gland 



ep epidermis v in Fig. 18 a portion of the par- 



f region where the ganglion and tition between pharynx and 



neural gland are fused together cloaca 



99 ganglion (brain) x in Fig. 15 the point at which 



gl neural gland the neural gland and rapheal 



n nerve duct unite 



ph.ep pharyngeal epithelium z in Fig. 21 the epithelium of the 



p.s.n posterior siphonal nerve duct of the neural gland 

 r. d rapheal duct 



Fig. 14 A ventral view of the ganglion and ciliated funnel of 

 Cynthia papulosa L. X 6 diameters. 



Fig. 15. A nearly sagittal section through the intersiphonal organs 

 of Cynthia papillosa L. At the anterior end of the ganglion the 

 section passes to the right of the median plane. X about 30 diameters. 



Fig. 16. A small portion of the epineural gland of Cynthia papil- 

 losa L., in sagittal section. X ^00 diameters. 



Fig. 17. A parasagittal section through the intersiphonal organs 

 of Cynthia carnea Verrill. The section passes to the right of the 

 median plane. X about 150 diameters. 



Fig. 18. A sagittal section through the intersiphonal organs of 

 Cynthia carnea Verrill. X about 150 diameters. 



Fig. 19. A dorsal view of the intersiphonal organs in Boltenia 

 reniformis MacL. The outline of the aperture of the funnel is indi- 

 cated in this figure. In reality this could be seen by reflected light 

 only in ventral view. X 12 diameters. 



Fig. 20. A cross section through the ganglion and neural gland 

 and adjacent parts in Boltenia reniformis MacL. X ^1 diameters. 



Fig. 21. A section through the duct of the neural gland in 

 Boltenia reniformis MacL. at the point where it receives the fibres 

 of the nerve which innervates it. This figure is an enlargement of a 

 portion of Text Fig. F on p. 515. X ^90 diameters. 



Figs. 22 and 23. Three ganglion cells from the nerve which in- 

 nervates the ciliated funnel in Boltenia reniformis MacL. X ^^0 diameters. 



