PLATE I. 
Figs. 1-12. Archidoris kerguelenensis, Bergh. 
Fig. 1. Central nervous system, from [above; a, a, pedal ganglia at the outer side of cerebro- 
pleural ganglia, near to them are the eyes and proximal olfactory ganglia ; b, the united 
sub-cere-bro-pleuro-pedal commissure ; c, buccal and gastro-cesophageal ganglia ; (Id, 
sanguineous gland. Cam. luc. x 200 diam. 
Fig. 2. Tubercle of skin. Cam. luc. x 200 diam. 
Fig. 3. Portion of rhinophorial leaf. Cam. luc. x 350 diam. 
Fig. 4. Two innermost teeth ; a, first lateral tooth ; b, second lateral tooth. Cam. luc. x 350 diam. 
Fig. 5. Large lateral tooth, from the inner side. Cam. luc. x 200 diam. 
Fig. 6 Large lateral tooth, from the outer side. Cam. luc. x 200 diam. 
Fig. 7. Innermost portion of a series of teeth ; a, rhachidian fold ; b, the first ; c, the eighth tooth. 
Cam. luc. x 200 diam. 
Fig. 8. Portion of series of largest teeth. Cam. luc. x 200 diam. 
Fig. 9. Outermost portion of a series of teeth ; a, the outermost ; b, the fourth tooth. Cam. luc. 
x 350 diam. 
Fig. 10. a, Stomach; b, intestine ; c, renal chamber. 
Fig. 11. a, Spermatheca; b, its chief duct (vagina); c, spermatocyst ; de, uterine duct. 
Fig. 12. a, Spermatic duct ; b, penis (the praeputium is opened and the glans visible). 
Figs. 13-18. Archidoris australis, Bergh. 
Fig. 13. The central nervous system, from above; ab, cerebro-pleural ganglia; c, c, pedal ganglia; d, 
common commissure ; e, e, proximal olfactory ganglia ; /, distal olfactory ganglia ; g, buccal 
ganglia ; A, li, gastro-cesophageal ganglia ; i, nervus genitalis issuing from ganglion genitale. 
Cam. luc. x 100 diam. 
Fig. 14. Part of the margin of the branchial groove. 
Fig. 15. Tubercles of the skin. Cam. luc. x 100 diam. 
Fig. 16. Two of innermost lateral teeth; a, the innermost. Cam. luc. x 350 diam. 
Fig. 17. Teeth of two different series from the outer side. Cam. luc. x 350 diam. 
Fig. 18. Outermost portion of two different series of teeth with five and three teeth; a, a, the outer- 
most ones. Cam. luc. x 350 diam. 
Figs. 19-22. Discodoris morjohcea, Bergh. 
Fig. 19. Otocyst on the surface of tbe cerebral ganglion (a). Cam. luc. x 350 diam. 
Figs. 20, 21. Spicules from skin. Cam. luc. x 200 diam. 
Fig. 22. a, CEsophagus ; b, stomach, behind which is the upper portion of the gall bladder ; cec, intestine ; 
dd, liver. 
