Plate I. 



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

 ammonium sulfate. ^5°/^ 



2. Nematocyst from the tentacle of Coryne Lovc'ni. Boehmers haematoxyline — Iron ammonium 

 sulfate. '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. ^i°\ x . 



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



175°^. 



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



nium sulfate, '^so/j. 



6. Nematocyst from the tentacle of Bougainvillia ramosa. Delafields haematoxyline — Iron 

 ammonium sulfate, ^so/j. 



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

 from the belt of stinging cells at the base of the polyp bod}'. Delafields haematoxyline — Iron 

 ammonium sulfate. ^^/j. 



— 8. Myriothela pJirygia; mutilated specimen from the "Ingolf" st. 125. 2 j 1 . 



— 9. Hydractinia cchinata ; spines from the Greenland specimen. ^/^ 



— 10. specimen from Greenland with extraordinarily large spines. z l z . 



— n. Hydractinia carica ; spines from the type specimen. ^/^ 



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



"Podocoryne carnea". 6 %. 



