Plate I. 



Figj'ures 1 — 8 Chromatonema ruhrum (Fewkes). 

 Figure i. A specimen from the Davis strait, "Tjalfe" stat. 336. Diameter 17 mm, lieiglit 14 mm. — >' 5. 



— 2. Part of the bell-margin with two tentacles and three cordyli. — ''Tjalfe" stat. 336. — >; 20. 



— 3. Cordylus with nematocysts. — "Tjalfe" stat. 336. — >; 65. 



— 4. Lateral view of a part of a radial canal with four female gonads. The gonads are faintly 



discerned through the lateral wall of the radial canal. The snbumbrella has been lifted up 

 in front in order to make it possible to peep into the pouches between the snbumbrella and 

 the dorsal wall of the radial canal. The eggs are visible, and the fissures leading to the 

 inner, narrow lumen of the gonadial sacks ar^ seen. — x i2. 



— 5. Horizontal longitudinal section through the lower part of the gonadial sacks. In most of 



the gonads the inner lumen with its ectodermal epithelium is seen. Two of the gonads on 

 the left side have been hit so far below, that the lumen has not been touched by the sec- 

 tion. — >: 24. 



— 6. Horizontal longitudinal section through the same radial canal. This section has passed 



through the upper part of the gonadial sacks, showing the openings of the gonads into the 

 bell cavity. — -- 24. 



— 7. Transverse section of a radial canal with two female gonads. The gonad to the left has 



been hit nearl\- in the middle, exhibiting the entodermal (outer) epithelial cover of the sack, 

 the eggs, and a small part of the ectodermal epithelium of the lumen. On the right side 

 the section has just passed through the entodermal epithelium of the gonad. Above the left 

 gonad is seen the pouch between the dorsal wall of the canal and the subumbrella. On the 

 right side the section has passed through one of the branches of the line of attachment of 

 the canal. — x 25. 



— 8. Transverse section through a radial canal with two male gonads. To the left the section 



has passed nearly through the middle of the gonad, showing the ectodermal lumen, tlie 

 spennatocytareous and the spermatogonia! parts of the testis, and the entodermal epithelium 

 of the sack. On the right side the section has passed mainly through the spermatogonia! 

 part of the testis. Tlie ventral part of the canal is wanting. — "Thor" stat. 93 (04). — x 25. 



— 9. Sfd/iro/i/iorti iiicrtciisii Brandt. — A part of the bell-margin of a specimen from Borgundfjord 



near Aalesund, Norway. Showing tentacles with entodermal spurs, cordvli, and centripetal 

 furrows in the exuml:)rena. — x 30. 



— 10. Mcliccrtuiii octocvstattiiii (W. Sars). — Radial canal seen from the subumbrella side. A part 



of the lateral wall of the stomach is seen from the inner side, showing the vertical fissure 

 connecting the radial canal with the stoniacli cavitv. — "Thor" stat. 203 (04). — x 10. 



