1903] Report on some Medusae from Norway and Spitzbergen. 31 



Some of the specimens have the margin of the umbrella in good 

 condition, showing very well the tentacles and the sense-organs, 

 but the umbrella has lost its natural shape which makes the iclen- 

 fication of the species somewhat doubtful. Some look more like 

 early stages of Periphylla regina, Haeckel, as figured by Van- 

 hoffen (1902), but as Periphylla hyacinthina is the species be- 

 longing to the North Atlantic, I presume that they are all young 

 stages of that species. 



The umbrella has a rounded summit as figured for an early 

 stage of Periphylla hyacinthina by Vanhoffen (1892, Taf. I, fig. 1), 

 but the top of stomach is not so pointed. It is shorter and more 

 like a broad flat cone. The whole stomach and mouth have a rich 

 dark red colour. On the margin of the umbrella there are forn* 

 sense-organs and twelve tentacles (3 tentacles between every two 

 sense-organs) and sixteen marginal lobes. The margin of the um- 

 brella with its lobes is almost colourless and transparent, but there 

 is a faint trace of yellow in patches above the tentacles and the 

 sense-organs. The figures given by Vanhoffen, which were sket- 

 ched from living specimens, show the marginal lobes to be ricbly 

 pigmented with the same colour as the stomach. The gastric fila- 

 ments are clearly visible inside the stomach. There is no trace of 

 any gonads. The diameter of the umbrella across the margin is 

 about 5 — 15 mm., but in the largest specimens the margin is much 

 flåttene d out. 



Herløfjord. 0—400 m. 6. 1. 1899. One specimen. 



Herløfjord. 0—400 m. 14. 3. 1899. Three specimens. 



Byfjord. 0—400 m. 14. 7. 1899. One specimen. 



Byfjord. 0—400 m. 30. 1. 1901. Two specimens. 

 Noedgaard (1900) found Periphylla hyacinthina in Puddefjord 

 in January 1899. 



Discomedusae. 

 Aurelia aurita (Linn). 



Hjeltefjord. 2. 9. 1898. One specimen. 

 The Ephyra-stage. 4 mm. in diameter. 



Osterfjord. 0—300 m. 24. 9. 1902. One specimen. 

 An early stage of the adult form. Umbrella 7 mm. in diameter. 

 The marginal tentacles are just beginning to develop. 



