Plate I. 



Fig. I. Nematoc)'st from the tentacle of Monocoryiic gigantea. Delafields haematoxyline — Iron 



/I- 



— 2. Nematocyst from the tentacle of Corync Lovnii. Boehmers haematoxyline — Iron ammonium 



sulfate. '757i. 



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



the rarer, narrow type. Delafields haematoxyline — Iron ammonium sulfate. '75°/,. 



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



— 5. Nematoc)'st from the tentacle of Clava i/ml/icoruis. Delafields haematoxyline — Iron ammo- 



nium sulfate, ^^y'|l. 



— 6. Nematocyst from the tentacle of Bougaiiivillia raiiiosa. Delafields haematoxyline — Iron 



ammonium sulfate. '757i- 



— 7. Nematocysts from Eicdendrium Wright i^ 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, ^^^°l■^. 



— 8. Myriothela phrygia; mutilated specimen from the "Ingolf" st. 125. ^/i. 



— 9. Hydractinia echinata ; spines from the Greenland specimen, '^/j. 



— 10. — — specimen from Greenland with extraordinarily large spines, ^/j. 



— II. Hydractinia carica; spines from the tvpe specimen. ^7i- 



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



^'■Podocoryne carnca". ^/j. 



