1903] Report on some Medusae from Norway aud Spitzbergen, 13 



perradial aud -JL interradial) and 4 smaller varying in size. Gonads 

 on the stomach. 



Hjeltefjord. 0—100 m. 29. 4. 1899. One specimen. 

 Umbrella 2 mm. in length and width. 24 tentacles. 



Herløfjord. 0—400 m. 16. 5. 1900. Three specimens. 



a) Umbrella 3 mm. in length and width. 25 tentacles (22 large 

 and 3 small ones). Gonads present. 



b) Umbrella 3 mm. in length and width. 



c) Umbrella 3 mm. in length and width. 23 tentacles. 



Osterfjord. — 25 m. 26. 4. 1901. One specimen. 



Umbrella 3 mm. in length and 2 1 / 2 mm. in width. 16 large 

 tentacles and about six very small ones. Gonads present. Mouth 

 with four lips. each armed with a double, terminal, duster of nema- 

 tocysts. 



I must take the sole responsibility for the name given to this 

 medusa, and at present do not feel certain about the correctness 

 of it. Haeckel gave the name of Cytaeandra areolata to the me- 

 dusa liberatecl from the hydroid Podocoryne areolata, Aldee, and I, 

 unfortunately, used the name somewhat prematurely for a certain me- 

 dusa tåken on the British Coast. I had traced the life-history of 

 the medusa to a stage agreeing with the description of the medusa 

 given by Aldee, but never connected it with the hydroid, which I 

 have not vet succeeded in Ånding. 



The medusa, according to Aldee, is liberated with 16 tentacles, 

 but lately I have seen early stages of Cytaeandra with less than 

 that number (there is one in this collection) which may, however, 

 be due to numerical variation. The correctness of the identification 

 can only be proved by connecting the medusa with its hydroid, which 

 is almost certain to belong to the genus Podocoryne. 



In my description of this medusa (P. Z. S. 1897) I have sta- 

 ted that the medusa has oral tentacles, but I have since found that 

 statement to be due to an error in my observations. A distinction 

 must be drawn between oral tentacles with terminal dusters of 

 nematocysts, and the margin of the mouth prolonged into lips or 

 lobes bearing terminal dusters of nematocysts. Cytaeandra areolata 

 has the margin of the mouth prolonged into four, long, narrow, 

 contractile lips, which look uncommonly like oral tentacles when they 

 are fully extended. Each lip bifurcates near the extremity and has 

 two dusters of nematocysts, which are peculiar in shape, situated on 

 fine stalks, and have been seen to rapidly vibrate or to quiver. 



On the British coast this medusa is somewhat scarce. 



