PLATE VI. 
Figs. 1-4. Cliromodoris runcinata, Bergli. 
Pig. 1. Elements of the armature of labial disk. Cam. luc. x 750 diam. 
Fig. 2. Outer part of three series of teeth ; a, two outermost ; b, second and third ; c, third. Cam. 
luc. x 750 diam. 
Fig. 3. Two teeth from the middle of a series. Cam. luc. x 350 diam. 
Fig. 4. a, Spermatheca ; b, vaginal duct ; c, vagina ; d, uterine duct ; e, spermatocyst. 
Figs. 5-18, 20, 21. Onchidium melanopneumon, Bergli. 
Fig. 5. Median part of two series of teeth ; a, median ; b, b, b, b, first lateral teeth. Cam. luc. x 350 
diam. 
Fig. 6. a, Pharynx ; b, oesophagus ; e, superior bile duct ; d, inferior bile duct ; e, first stomach ; /, 
second stomach ; g, posterior bile duct ; h, third stomach ; i, ampulla of h, intestine. 
Fig. 7. The same from the side ; b, c, e,f, as above ; d, inferior liver ; g, posterior liver. 
Fig. 8. Longitudinal section of inferior half of second stomach; a, opening into first stomach; b, 
recess in its cavity ; c, posterior bile duct. 
Fig. 9. Transverse section of the same. 
O 
Fig. 10. a ; Posterior bile duct, with isolated small hepaticula. 
Fig. 11. Part of atrium cordis, with a, atrio-ventricular valves. 
Fig. 12. a, Hermaphrodite gland with coiled duct ; b, mucous gland ; c, duct of mucous gland (vagina) ; 
dd, vas deferens enclosed in the body wall (cf. fig. 21c) ; ef, its coiled-up portion lying in 
body cavity and ending in the penis, g ; h, dart-gland ; ii, ampulla of the duct (Jc ) ; l, dart- 
sac. 
Fig. 13. Lobules of hermaphrodite gland ; a, duct. Cam. luc. x 100 diam. 
Fig. 14. a, Common orifice (with protrusors) of dart sac b, and praeputium h ; cc, duct of (the ampulla of) 
the dart-gland ; d, first free portion of vas deferens ; ee, prostatic part of same ; fg, muscular 
part ; h, praeputium ; i, retractor muscle of the penis ; k, its continuation into the common 
sac of praeputium and dart. 
Fig. 15. a, Common sac opened ; b, praeputium ; c, vas deferens ; d, dart-sac opened containing dart- 
cone ; e, duct of (the ampulla of) the dart-gland. 
Fig. 16. Praeputium opened to show glans ; a, vas deferens. 
Fig. 17. End of glans penis. 
Fig. 18. The dart; a, point; b, base; c, wall of dart-cone; d, continuation of dart-duct. Cam. 
luc. x 100 diam. 
Fig. 20. End of dart. Cam. luc. x 350 diam. 
Fig. 21. Vertical section through body wall; a, internal part of genital furrow; b, external part; 
c, section of vas deferens. 
Fig. 19. Onchidium tonganum, Quoy et Gaimard. 
Fig. 19. Fore end of dart in various positions. Cam. luc. x 100 diam. 
