PLATE V. 



Colours: see Plate I and Plate IV. 



Figs. 141 — 145. Hcmimenia intermedia. 



Figs. 141 — 143. See Plate IV. 



Fig. 144. Transverse sections through the gland of the penis-spicula. A the vesicles ^ and /< 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, drawn 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- / fold of the dorsal wall of the mouth-cavity. 

 Figs. 151 — 157 Schematic transverse sections along the lines AB—A'O of fig. 150. 20 X. 



f fold of the dorsal wall of the mouth-cavity, sg salivary gland, /, l> and a see text, 



;- rii 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, /> o precloacal organ, / cloaca-fold, v ventricle, c. s/> 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. »t c mouth-cavil.,. 



rs radula-sac, /^ pharyngeal glands, sg salivary glands. 

 Fig. 177- Transver.se section through the radula. 50 x. <j tooth, /> base of the next tooth. 



Figs. 178—179. Lateral and median longitudinal section through the po.sterior extremity, t/s dorso-terminal 



sense-knots. 



