28 
Siphonophora Rosarum 
Fig. 18. The next serial section to that shown in Fig. 17. In this section the main 
salivary duct is seen in the mid-ventral line beneath the nervous system. ( x 152.) 
Fig. 19. A longitudinal oblique section through the middle region of the body, showing 
the two salivary glands of one side, the duct from each meeting and joining, and the 
main salivary duct beneath the nervous system. ( x 236.) 
Fig. 20. The central nervous system as seen from above. Semi-diagrammatic. ( x 152.) 
Fig. 21. Longitudinal horizontal section cutting through an embryo just about to descend 
through the oviduct into the vagina and pass outwards. ( x 72.) 
Fig. 22. Lateral view of the two stigmata to show the dorsal and ventral divisions of the 
short main trachea from the stigma. ( x 108.) 
Fig. 23. A single stigma to show short main trachea. ( x 630.) 
Fig. 24. A piece of the “ secundare Dotter.” ( x 355.) 
Corrections: In Fig. 1 the chitinous rods (cli. r.) on the left side of the figure should 
show a cross line as on the right above the upper dotted line leading to cli. r. In Fig. 4 
the dotted line leading from p. to. (small protractor muscle) should not traverse the space 
to the right of the muscle. In Fig. 20 for circ. ves. conn, read circ. oes. conn.; the swelling 
beneath (opposite n. mus.) represents the sub-oesophageal ganglion. 
NOTE. 
Since going to press, it has been brought to my notice that the 
homologies of the Hemipterous mouth parts are now generally accepted. 
The structures which have been called the anterior setae will therefore 
represent the mandibles, and the posterior setae, the first maxillae. 
