Note on the morphology of the Tunicata. 



597 



neural gland. The drawing is a reconstruction from serial longitudinal 

 sections in the vertical plane compared with serial cross sections. 

 X 515 diameters. 



Fig. 34. A cross section through the ganglion and neural gland 

 of Eugyra pilularis Verbill. The line through the ganglion and gland 

 indicates the plane of the oblique longitudinal section shown in Fig. 33. 

 X 603 diameters. 



Fig. 35. A cross section through the ciliated funnel of Eugyra 

 pilularis Vbrrill, designed especially to show the darkly staining 

 gland cells among the epithelial cells of its flaring lips. X ^03 dia- 

 meters. 



Fig. 36. A parasagittal section through the intersiphonal organs 

 of Bostrichohranchus molguloides n. sp., a little to the right of the 

 median plane. X ^5 diameters. 



Fig. 37. An enlarged drawing of that portion of the last figure 

 near the point marked x. X ^^^ diameters. 



Plate 37. 

 Reference letters. 



a.s.n anterior siphonal nerve 



h.s in Fig. 42 blood sinus 



C.f ciliated funnel 



eg in Fig. 49 coagulum 



cl in Fig. 40 cloaca 



cl. a in Fig. 40 cloacal aperture 



cl. ep cloacal epithelium 



d duct of neural gland 



d. r dorsal raphe 



ep epidermis 



f region where the ganglion and 



neural gland are fused together 

 gg ganglion (brain) 

 gl neural gland 

 gl' the anterior chamber of the 



neural gland 

 gl" the posterior part of the neural 



gland. It is with this part of 



the gland that the ganglion is 



fused 

 mo mouth (aperture of branchial 



siphon) 

 nc nucleus 

 ph. b in Fig. 44 peripharyngeal band 



Fig. 38. A dorsal view of the intersiphonal organs of Boiryllus 

 goiildi Verbill. A reconstruction from serial sections. 



ph.ep pharyngeal epithelium 



p.nc in Figs. 44 and 48 para- 

 nuclear body 



p.s.n posterior siphonal nerve 



r.d in Fig. 47 rapheal duct 



r.n rapheal nerve 



st in Fig. 43 line of demarkation 

 between the thickened epithelium 

 of the stomodaeal invagination 

 and the delicate epithelium of 

 the tentacles 



t in Fig. 43 outer surface of the 

 test 



VC in Fig. 49 vacuole 



X in Fig. 42 blood sinus full of 

 granular cells which may be 

 phosphorescent. 



y in Fig. 47 the rod of cells in 

 the raphe, an outgrowth from 

 a common mass of cells formed 

 by the fusion of the ganglion 

 with the end of the rudimentary 

 rapheal duct 



