PLATE IV. 
Figs. 1-4. Chromodoris striatella, Bergh. 
Pig. 1. a, a, Buccal ; b, b, gastro-oesophageal ganglia. Cam. luc. x 100 diam. 
Fig. 2. Two teetli from the outermost third of a series of teeth. Cam. luc. x 750 diam. 
Fig. 3. a, Truncus aortas; b, the ventricle; c, atrium ; del, hinder part of renal organ, in the middle 
is the renal chamber with its continuation into the ureter, on the right side the renal syrinx 
with its duct, behind the vena hepatica magna. 
Fig. 4. a, Spermatheca; b, vaginal duct ; c, uterine duct; d, spermatocyst. 
Figs. 5, 6. Doriopsis nebidosa, Pease. 
Fig. 5. Everted glans penis, showing a, armature continuous with that in interior of vas deferens. 
Cam. luc. x 350 diam. 
Fig. 6. End of glans penis. Cam. luc. x 750 diam. 
Figs. 7-24. Euplocamus pacijicus, Bergh. 
Fig. 7. Central nervous system, from the upper side ; a, cerebral ; b, b, visceral ; c, c, pedal ganglia ; d, 
common commissure ; e, e , proximal olfactory ganglia ; /, buccal ganglia. Cam. luc. x 100 
diam. 
Fig. 8. The same, from behind. Letters as above. 
Fig. 9. Otocyst upon the surface of the ganglion («). Cam. luc. x 350 diam. 
Fig. 10. A spicule of the skin. Cam. luc. x 350 -diam. 
Fig. 11. Labial plate, from the inside; a, its upper end. Cam. luc. x 55 diam. 
Fig. 12. The same, from the fore-end. Cam. luc. x 55 diam. 
Fig. 13. Part of the radula, with 2 (3) series of teeth ; a, a, first ; b, b, second lateral teeth ; c, c, outer- 
most teeth. Cam. luc. x 100 diam. 
Fig. 14. a, First, b, second, lateral tooth, from above. Cam. luc. x 200 diam. 
Fig. 15. The same, from the side. Cam. luc. x 200 diam. 
Fig. 16. First (innermost) and second of the outer teeth, from the inner side. Cam. luc. x 200 diam. 
Fig. 17. a, Fourth ; b, fifth tooth, from above. Cam. luc. x 200 diam. 
Fig. 18. Outer teeth, from above ; a, a, the innermost. Cam. luc. X 200 diam. 
Fig. 19. Basal portion of teeth; a, third tooth; b, sixth. Cam. luc. x 350 diam 
Fig. 20. Fore end of armature of ductus ejaculatorius. Cam. luc. x 350 diam. 
Fig. 21. Hinder end of same. Cam. luc. x 350 diam. 
Figs. 22, 22. Part of cuticle with hooks. Cam. luc. x 750 diam. ~ 
Fig. 23. a, Basal portion of spermatheca; b, vaginal duct; c, vagina; dd, uterine duct; e, spermato- 
cyst. 
Fig. 24. a, Funiculus spermaticus ; b, prseputium penis. 
Figs 25-27. Onchidium melanopneumon, Bergh. 
Fig. 25. Tubercle of the skin. 
Fig. 26. Bulbus pliaryngeus, from above ; a, radula-sheatli. 
Fig. 27. Phachidian portion of the radula ; a, median ; b, b, first lateral ; c, c, second lateral teeth. Cam. 
luc. x 350 diam. 
