Plate I. 



Fig. i. Nematocyst from the tentacle of Monocoryne gigantea. Delafields haematoxyline Iron 

 ammonium sulfate. ^so/j. 



2. Nematocyst from the tentacle of Coryne Lovcni. Boehmers haematoxyline Iron ammonium 

 sulfate. J 75/,. 



3. Nematocysts from the tentacle of Myriothela phrygia, a: of the general, ovoid type, b: of 

 the rarer, narrow type. Delafields haematoxyline - - Iron ammonium sulfate. ^so/,. 



4. Nematocyst from the tentacle of Tubularia indivisa. Delafields haematoxyline van Giesson. 

 '%. 



5. Nematocyst from the tentacle of Clava multicornis. Delafields haematoxyline -- Iron ammo- 

 nium sulfate. '75%. 



6. Nematocyst from the tentacle of Bougainmllia ramosa. Delafields haematoxyline - - Iron 



ammonium sulfate. ^s /,. 



7. Nematocysts from Eudendrium Wrighti, a: small type from the tentacles, b: larger type 

 from the belt of stinging cells at the base of the polyp body. Delafields haematoxyline Iron 

 ammonium sulfate. ^s /^ 



8. Myriothela phrygia; mutilated specimen from the "Ingolf" st 125. 2 /i- 



9. Hydractinia echinata; spines from the Greenland specimen. 6o / I . 



10. specimen from Greenland with extraordinarily large spines. 2 / r . 

 ii. Hydractinia carica; spines from the type specimen, ^/i. 



12. Hydractinia Sarsii; spines from a specimen from Godthaab harbour, wrongly labelled 



"Podocoryne carnea". 6o / I . 





