PLATE III. 



Colours : see Plate I. 



Figs. "jG — 82. Dinonienia verrucosa. 



sec Plate II. 



Reconstruction of tlio posterior extremity of a young specimen. 18 x- Dorsal view. 



Schematic transverse sections through the posterior extremity of another specimen, along 



the lines AB — G H of fig. 78. 4 x- 

 figs. 81, 82. a atrium, v ventricle. 



Figs. 83 — 100. Proparamenia bivalens. 



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

 84. 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. 

 87. Reconstruction of the anterior extremity out of transverse sections, 30 x. opening of 



the right salivary duct s d. 

 Radula-teeth, 215 x- 



Transverse section through pharynx and radula r, 88 X. 

 Transverse section through the radula-sac, r radula, rt fragments of radula-teeth (r), 



cc cartilaginous cells, pli pharyngeal wall, 88 x- 

 Pharyngeal glands, 88 X. 

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



III circular muscle, sg glandular part. 

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



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. loi — 112. Rhopalomenia indica. 



P^igs. lOi — 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. 



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



Fig. 106. Section along the line E F 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. .f^"- salivary duct, 



Figs, no, III. 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. gc glandLihu cells, sd salivary duct. 



