Plate V. 



Figures i 2. Phialidium islandicum nov. spec. 



Figure i. Part tjf the bell-margin, showiiig marginal vesicles alternating with the tentacles. - - Iceland, 

 "Thor" stat 176 (04). - - x 20. 



2. Longitudinal section through a tentacular bulb, perpendicularly to the circular vessel. - 

 Iceland, "Thor" stat 266 (04). - - x 50. 



3. Phtalfdium hemisphartcum (Gronovius). - Longitudinal section through a tentacular bulb, 

 perpendicularly to the circular vessel. - - Myri Bugt, Iceland. x 50. 



Figures 4 10. Tima bairdii (Johnston). 



4. Dorsall wall of the stomach, showing the four deep grooves and the entrances to the four 

 radial canals; the two entrances to the left are closed, the two others are open, showing 

 the transversal folds in the proximal part of the radial canals. The lateral walls of the 

 stomach have been removed. - - From a Danish specimen. - - x 8. 



5. Lateral view of the manubrium and the lower end of the stomachal peduncle; showing the 

 four large, folded lips and the triangular pouches between the dorsal wall of the stomach 

 and the peduncle. The cross-shaped figure, along the arms of which the stomach is attached 

 to the peduncle, is discerned 'through the jelly of the latter. In this specimen the "cross- 

 arms" do not meet exactly in the centre. - - From a Danish specimen. x 8. 



6. Part of the bell-margin, seen from the abaxial side, with two tentacles (observe the abaxial 

 spur-like projection at the base of the bulbs) and a number of marginal warts and marginal 

 vesicles. -- - From a Danish specimen. - - x 5. 



7. Lateral view of a tentacular bulb. The margin of the umbrella, the circular vessel, and the 

 velum are seen in section. The basal spur on the tentacular bulb is distinctly visible. Above 

 the tentacle is seen the rounded gelatinous protuberance of the exumbrella. x 5. 



8. Section through the bell-margin and a tentacular bulb; showing the entodermal, basal spur, 

 covered by the epitheliiim of the exumbrella. -- x 12. 



9. Section through the bell-margin. The section has passed through the middle of a marginal 

 wart with a marginal vesicle situated on the adaxial side close to the velum. - - x 65. 



10. Transverse section through a radial canal (the part on the stomachal peduncle) with male 

 gonads; showing the mode of attachment to the subumbrella, mentioned in the text, p. 103. 

 x 65. 



