PLATE IV. 



Colours: see Plate I. 

 Fig. 113. Dinomenia Hubrechti. Glandular tissue around the salivary glands. 40 x- 



Figs. 114 — 117. Rhopalomenia debilis. 



Fig. 114. Rhopalomenia debilis, drawn from the spirit-specimen. 4 X. 



Figs. 115, 116. Schematic transverse sections through the anterior extremity; fig. 1 16 more proximally. 40 X. 



a salivary duet, b rudimentary radula-sac, hb "hintere Bauchdrüse". 

 Fig. 117. Transverse section through the rudimentary radula-sac. 215 X. 



Figs. 118 — 140. Hemimenia intermedia. 



Violet the penis-gland, orange the carina-pouches. 



Fig. 118. Hemimenia intermedia, drawn from a spirit-specimen. 4 X. 



Fig. 119. The same specimen from the dorsal side. 4 X- 



Fig. 120. Spicula 215 X. a, f flat spicula of the body-wall and the carina, b lance-point-shaped 



spicula of the carina-pouches, c, d, e pointed spicula along the ventral groove of the 



body-wall. 

 Fig. 121. Hypodermal cells and cuticle of the body-wall. 316 X. 



Fig. 122. The same of the carina-pouches. 316 X. 



Fig. 123. Longitudinal median section through the anterior extremity out of transverse sections. 



18 X. See text. 

 Figs. 124 — 130. Transverse sections along the lines A B — NO of fig. 123 vb "vordere Bauchdrüse", 



li b "hintereBauchdrüse", er cirrhi, 111 mouth-opening, ml "Mundleisten", e/cilia. 18 x- 

 Figs. 131 — 143. Transverse sections through the posterior extremity. 18 X. 



ƒ (figs. 130 — 133) represents the course of the blood, o opening of the precloacal organ 



p o into the cloaca, r s receptaculum seminis. See text. 



