Plate II. 



Figures i 8 Laodicea undiilata (Forbes and Goodsir). 

 Figure i. A specimen seen from the top. - - x 3. 



2. Radial canal with gonads and a part of the stomach ; showing the grooves along which the 

 dorsal wall of the stomach is attached to the subumbrella. The corner of the mouth and 

 the ventral side of the funnel-shaped, part of the radial canal have been cut open. The 

 gonads. commence at the point, where the open groove becomes closed by means of the 

 two lateral folds, mentioned in the text (p. 17). The dark, wavy line is the narrow, nearly 

 closed fissure between these folds, connecting the space between the gonads with the sto- 

 mach and the funnel-shaped dilatation. The proximal parts of the gonads are faintly visible 

 through the dorsal wall of the stomach. - - From a specimen, about 25 mm in diameter, 

 from Myri Bugt, Iceland, July 2ist 1904. -- x 6. 



3 and 4. Transverse sections (made by hand) through the radial canal of a male specimen from 

 "Michael Sars" stat 140, June 26th 1903. Showing the lateral folds of the walls of the canal 

 containing the sexual products, and, below, the funnel-shaped part of the canal. 



5 and 6. Radial sections (made by hand) through the bell-margin with tentacles in different 

 stages of development. The tentacle represented in fig. 5 is comparatively young and has 

 a well-developed basal spur. The tentacle in fig. 6 is fully developed the basal part of the 

 abaxial side of the tentacle has grown upwards along the exumbrella and caused the spur 

 to disappear. Observe the ectodermal thichening on the adaxial side, and the course of the 

 central canal. 



7. Transverse section (microtome-section) through the dorsal wall of the stomach near the 

 corner of the latter, showing male gonads and the two lateral folds. Owing to the prepara- 

 tion these have separated a little from one another, thus not completely separating the 

 space between the gonads from the stomachal cavity. , "Michael Sars" stat. 140 (03). - - x 30. 

 8. Part of the bell-margin seen from the abaxial side, with tentacles, cordyli, and a single cir- 

 rus (to the left). In two of the tentacles the spur has disappeared. - Myri Bugt, Iceland, 

 July 24th 1904. x 15. 



Figures 9 10 Stauropkora mertensii Brandt. 



Figure 9. Complexly folded gonads seen from above. The gonads have been carefully detached from 

 the subumbrella, showing the branched lines, by which they have been attached. - - Myri 

 Bugt, Iceland, August gth 1904. - - x 10. 



10. Longitudinal section through a tentacular bulb and the circular vessel. The gelatinous sub- 

 stance of the bell-margin is much shrivelled. -- "Thor" stat. 45(08). -- x 50. 



