PLATE V. 



Colours: see Plate I and Plate IV. 



Figs. 141 — 145. Hemimenia intermedia. 



Figs. 141- — 143. See Plate IV. 



Fig. 144. Transverse sections through the gland of the penis-spicula. A the vesicles g and h have 



not yet united, B the two vesicles are united. 125 X- 

 Fig. 145. Transverse sections through a penis-spiculum with its epithelial sheath. 125 X. 



A distal, C proximal part. 



Figs. 146 — 171. Cyclomenia holosericea. 



Fig. 146. The animal, dravvn from the spirit-specimen. 4 x- 



Fig. 147. Spicula. A of the body-wall, B along the ventral groove. 88 x- 



Fig. 148. Section through the integument. 125 x. 



Fig. 149. Transverse section through the ventral furrow, cf. fig. 164. 50 x- 



Fig. 150. Reconstruction of the anterior extremity out of transverse sections. The red line indicates 



the contour of the radula. 20 X- ƒ fold of the dorsal wall of the mouth-cavity. 

 Figs. 151 — 157 Schematic transverse sections along the lines AB — NO of fig. 150. 20 X. 



f fold of the dorsal wall of the mouth-cavity, sg salivary gland, p, b and a see text, 



r m radula-muscles. 20 X. 

 Fig. 158. Transverse section through the radula-sac. Radula-plates red. 88 x. 



Fig. 159. Transverse section through the radula in the pharynx. 50 X. 



Fig. 160. A part of the radula-muscles. 70 X. 



Figs. 161 — 171. Schematic transverse sections through the posterior extremity. 20 X. See text. 



a atrium, p o precloacal organ, / cloaca-fold, v ventricle, c. sp cloaca-spicula. 



Figs. 172 — 179. Dondersia annulata. 



Fig. 172. The animal, drawn from the spirit-specimen. 4 X. 



Fig. 173. Spicula. 316 X. A and B of the body-wall, C along the ventral groove. 



Figs. 174 — 176. Schematic transverse sections through the anterior extremity. 40 X. m c mouth-cavity, 



rs radula-sac, p g pharyngeal glands, sg salivary glands. 

 Fig. 177. Transverse section through the radula. 50 X. a tooth, b base of the next tooth. 



Figs. 178 — 179. Lateral and median longitudinal section through the posterior extremity. ds dorso-terminal 



sense-knots. 



