PLATE IX. 
Figs. 1-5. Rizzolia australis , Bergh. 
Fig. 1. Part of margo masticatorius ; a, processus masticatorius. Cam. luc. x 350 diam. 
Fig. 2. Upper part of one of the teeth from radula. Cam. luc. x 350 diam. 
Fig. 3. Two teeth, obliquely from the side. Cam, luc. x 200 diam. 
Fig. 4. Another, in a similar position. Cam. luc. x 200 diam. 
Fig. 5. A single tooth, obliquely from above. Cam. luc. x 200 diam. 
Figs. 6-8. Janolus australis, Bergh. 
Fig. 6. Central nervous system, from above ; ctb, cerebro-pleural ganglia ; c, c, pedal ganglia ; d, d, 
eyes. Cam. luc. x 55 diam. 
Fig. 7. Median part of the radula (two series) ; a, a, median teeth ; b, cuticular continuation of the 
same ; e, c, first lateral plates. Cam. luc. x 350 diam. 
Fig. 8. Outermost part of a series of teeth ; a, outermost tooth. Cam. luc. x 350 diam. 
Figs. 9-22. Ohola pacijica, Bergh. 
Fig. 9. The animal, from above ; a, a, posterior papillae. 
Fig. 10. Mandibular plate; a, transverse; b, longitudinal part. Cam. luc. x 100 diam. 
Fig. 11. Part of the radula, with three series of teeth ; a, rhachis with its folds ; b, b, first lateral teeth ; 
c, c, c, c, second lateral teeth ; d, d, d, innermost external teeth ; e, e, e, outermost external 
teeth. Cam. luc. x 200 diam. 
Fig. 12. First lateral tooth, from the inner side. Cam. luc. x 350 diam. 
Fig. 13. The same, in another position. Cam. luc. x 350 diam. 
Fig. 14. a, First ; b, second lateral tooth, from the inner side. Cam. luc. x 350 diam. 
Fig. 15. Part of radula ; a, a, second lateral teeth ; b, innermost external tooth ; c, outermost tooth. 
Cam. luc. x 350 diam. 
Fig. 16. The two external plates ; a, innermost. Cam. luc. x 350 diam. 
Fig. 17. T Innermost external plate, from the side. Cam. luc. x 350 diam. 
Fig. 18. Anterior part of the armature of the vas deferens ; a, a, walls of the vas deferens proper. 
Cam. luc. x 750 diam. 
Fig. 19. Median part of the same ; a as above. Cam. luc. x 750 diam. 
Fig. 20. Posterior part of the same. Cam. luc. x 750 diam. 
Fig. 21. Part of the renal tubules. Cam. luc. x 350 diam. 
Fig. 22. a, Intestine ; b, urethra c, end of the renal chamber ; d, renal syrinx ; e, pericardium. 
