Plate I. 



Fig. I. Nematocyst from the tentacle of Alouocorync gigaiitca. Delafields haematoxyline — Iron 

 ammoninm sulfate. ^T^°j-i. 



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



sulfate. '75o/j. 



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



the rarer, narrow tN'pe. Delafields haematoxyline — Iron ammonium sulfate, '/so/j. 



— 4. Nematocyst from the tentacle of Tiibiilan'a iiidivisa. Delafields haematoxyline — van Giesson. 



— 5. Nematocyst from the tentacle of Clava iinilticor)iis. Delafields haematoxyline — Iron ammo- 



nium sulfate. '75<-yj. 



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



ammonium sulfate. '75°/i. 



— 7. Nematocysts from Eitdciidn'niii Wrigliti^ a: small t>-pe from the tentacles, b: larger type 



from the belt of stinging cells at the base of the polyp bod)-. Delafields haematoxyline — Iron 

 ammonium sulfate, '^^^°^l. 



— 8. Alyriothcla phrygia ; mutilated specimen from the "Ingolf" st. 125. '^j^. 



— 9. Hydractinia cchinata ; spines from the Greenland specimen. *°/i. 



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



— II. Hydractinia carica ; spines from the type specimen. '^°/i. 



— 12. Hydractiriia Sarsii; sjDines from a specimen from Godthaab harbour, wrongly labelled 



'■'■Podocoryne carnea". ^°/i. 



