PLATE III. 



Colours : see Plate I. 

 Figs. jó — 82. Dinomenia verrucosa. 



Figs. 76, TJ. see Plate II. 



Fio-. 78. Reconstruction of the posterior extremity of a young specimen. 18 x- Dorsal view. 



Figs. 79 — 82. Schematic transverse sections through the posterior extremity of another specimen, along 

 the lines A B — GH of fig. 78. 4 x. 

 figs. Si, 82. a atrium, v ventricle. 



Figs. 83 — 100. Proparamenia bivalens. 



Proparamenia bivalens, 4 x, from a spirit-specimen. 



Spicula 316 x- A of the body-wall, B along the ventral groove. 



Schematic transverse section through the anterior extremity along the lines AB — CD of 



fig. 87. 30 x. sg glandular part of the salivary glands, sd salivary ducts, m muscle. 



Reconstruction of the anterior extremity out of transverse sections, 30 X. o opening of 



the right salivary duet .ï d. 

 Radula-teeth, 215 X- 

 Fig. 89. Transverse section through pharynx and radula r, 88 X. 



Fig. 90. Transverse section through the radula-sac, r radula, rt fragments of radula-teeth (?), 



cc cartilaginous cells, ph pharyngeal wall, 88 x- 

 Fig. 91. Pharyngeal glands, 88 X. 



Transverse section through a salivary gland, 88 X. e epithelium of the salivary duet sd, 



m circular muscle, sg glandular part. 

 Reconstruction of the posterior extremity out of transverse sections, 30 X. rs recepta- 



culum seminis. 

 Schematic transverse sections along the lines A B — L M of fig. 93. c cloaca, a atrium, 



ds dorsal sinus, v ventricle, 30 x- 

 5 Sections through the pericardium and the heart. 40 x- gs gill-sinus, a atrium, v ventricle, 



ds dorsal sinus. 



Figs. 101 — 112. Rhopalomenia indica. 



Figs. IOI — 103. Rhopalomenia indica, drawn from spirit-specimens. 4 x- 



Fig. 104. Spicula 50 X. A of the body-wall, B around the cloaca-opening, C along the ventral groove. 



Fio-. 105. Reconstruction of the posterior extremity out of longitudinal sections, dorsal view. 18 x- 



Fig. 106. Section along the line EF of fig. 105. 7 x- 



Figs. 107, 108. Sections along the lines CD — AB of fig. 105. 11 X. eg cloaca-groove. 



Fig. 109. Reconstruction of the anterior extremity out of longitudinal sections. 18 x. sg salivary duet, 



Figs. 110, in. Schematic transverse sections along the lines AB — CD of fig. 109. 18 x. sg sublingual 



commissure. 

 Fig. 112. Transverse section through a salivary gland. 88 X. ge glandular cells, sd salivary duet. 



