Notes on the morphology of the Tunicata 



601 



Plate 40. 

 Reference letters. 



n. t in Fig. 80 neural tube 



oe. a "oesophageal" aperture 



ovy in Fig. 87 ovary 



ph in Fig. 81 pharynx 



pTi.ep in Fig. 88: pharyngeal epi- 

 thelium 



r. d in Fig. 86 rapheal duct 



r.m in Fig. 84 rapheal muscle 



r.n rapheal nerve 



s.gl in Fig. 83 "sub-neural gland" 



st in Fig. 81 stolon 



s.v in Fig. 80 "sensory vesicle" 



t in Fig. 87 testis 



X point of origin of the axial cord 

 of the stolon. 



a anus 



ax in Fig. 91 axis cylinder process 



C.f ciliated funnel 



cl in Fig. 81 cloaca 



cl.a cloaca aperture 



d.t in Fig. 83 "dorsal tubercle" 



en in Fig. 87 endostyle 



gg ganglion (brain) 



gl neural gland 



g.s gill slit 



in intestine 



m muscle 



m. h in Fig. 83 "muscle bundle" 



mo in Fig. 81 mouth 



n nerve 



n. g in Fig. 83 "nerve ganglion" 



Fig. 80. The nerve tube, ciliated funnel and neural gland (?) of 

 Mcgalocercus abyssorum, as seen from the right side. The otolith, 

 which lies in the sensory vesicle, is seen through the thin walls of the 

 ciliated funnel. (After Chun.) 



Fig. 81. Part of a colony of Octacnemus patagoniensis, as seen 

 from the left side. A shows the external appearance of an individual; 

 B and C show sagittal sections, except that the visceral mass in B is 

 shown entire and in C is dissected to show the alimentary tube. The 

 test is not shown in B and C. About natural size. 



Fig. 82. A dorsal view of the intersiphonal organs of Octacnemus 

 hithyus. (From Herdman, after Moseley , reference letters my own.) 

 "Magnified". 



Fig. 83. The intersiphonal organs and adjacent muscles of Octac- 

 nemus hithyus. Probably intended for a dorsal view. (After Hkrdman, 

 reference letters Herdman's.) "Magnified (s. 1.)". 



Fig. 84. A dorsal view of the external aspect of the visceral 

 mass of Octacnemus patagoniensis., designed especially to show the 

 peculiar dorsal muscles. About natural size. 



Fig. 85. A ventral view of the external aspect of the visceral 

 mass of Octacnemus patagoniensis., designed especially to show the gill 

 slits. About natural size. 



Fig. 86. A diagrammatic reconstruction of the intersiphonal organs 

 of Octacnemus patagoniensis^ as seen in dorsal view. 



Fig. 87. The visceral mass of Octacnemus hithyus, as seen from 

 the left side. (From Hekdmax , after Moseley , reference letters my 

 own.) "Enlarged". 



Fig. 88. A transverse section through the intersiphonal organs of 

 Octacnemus patagoniensis. X ^l^o^t 50 diameters. 



