NILS ODHNER. NORTHERN AND ARCTIC INVERTEBRATES. III. OPISTHOBRANCHIA ETC. 



Plate I. 



Fig. 1. Diaphana glacialis n. sp., shell from the back. Mossel Bay. f. 

 Fig. 2. The same, shell from the aperture, f. 

 Fig. 3. The same, shell from the spire. '{■ 



Fig. 4. The same, part of the radula ; the median plates pushed a little together and the lateral ones of the right side 



shifted outwards. Hackluyts Headland. 1 f s . 

 Fig. 5. The same, three median plates after slight depression, showing the swellings of the margins. Cross Bay. 2 -p 

 Figs. 6 — 9. Philine scabra Müller, shells, showing the gradual depressions of the outer lip and the transitions to var 



Loveni (fig. 9). 



Fig. 6 from Torekov — Arilds läge, f ; fig. 7 from Landskrona — Heisingborg, \ ; fig. 8 from Gäsöfjord. 

 Gullmarn, T ; fig. 9 from Lindholmen, Gullmarn, f. 

 Fig. 10. Gonia;olis lobata n. sp. from the upper side, with a few papillae and marks of others which have fallen off. f. 



The arrow shows the place for the transversal section in text-fig. 1. 

 Fig. 11. The same from the right side: at the anterior end the mouth with lips projecting: above the side-lobe« of the 

 head the genital orifice with the penis stretched out ; farther back the anus and the porus renalis on the 

 right side of it. '}. 

 Fig. 12. The same, part of the radula. l -J- G . 



Fig. 13. The same, two median teeth of the radula seen from the side. X T °. 

 Fig. 14. Archidoris nobilis Loven from above. Skär, Gullmarn. f. 



Fig. 15. The same from the under side: the anterior margin of the foot turned down in order to show the conic ten- 

 tacles ; to the left the stretched penis and hehind it the female genital orifice. |-. 

 Fig. 16. The same, a row of teeth from one side of the radula and 6 teeth from the opposite side. V" 

 Fig. 17- The same, a single tooth from the radula. b T s . 



Fig. 18. The same, transversal section of two teeth and the basal membrane, along the line AB in fig. 17- x 8 - 

 Fig. 19. Platydoris planata Alder & Hancock, from above. Kristineberg. f. 



Fig. 20. The same, the anterior half from the under side : to the left the female genital aperture with a cutaneous 



process containing a few eggs. §-. 

 Fig. 21. Issa villosa n. sp. Bel Sound, Spetsbergen. f. 

 Fig. 22. Doridunculus pentabranchus n. sp. Skagerrack \. 

 Fig. 23. The same, part of the radula. 2 T 2 . 



