24 Edward T. Browne. [No. 4 



Hjeltefjord. 0—50 m. 6. 11. 1900. One specimen. 



Umbrella 3 mm. in width and 3V2 mm. in length. No gonads 

 present. 



Perhaps an early stage of Aglantha digitalis. 



Hjeltefjord. 0—245 m. 25. 4. 1901. Three specimens. 



Very early stages. About V/ 2 mm. in length. 



One specimen witli 16 tentacles and 4 sense organs. 



Hjeltefjord. Surface. 25. 4. 1901. Seven specimens. 



Early stages. Umbrella abont 2—4 mm. in length. 



I have placed all these specimens under the name of Aglantha 

 rosea, but it is quite likely that some of them belong to Aglantha 

 digitalis. The specimens are not in very good condition, nearly all 

 the tentacles have disappeared and so also have the sense organs. 

 The sense organs are important for the determination of the species. 

 Aglantha digitalis has always four sense organs. Aglantha rosea 

 has eight, one in each octant, but in the earliest stages only four 

 are present; the others appearing a Little later. 



In their general external appearance nearly all the specimens 

 look like early and intermediate stages of Aglantha rosea, and in 

 one specimen I found three sense organs in adjacent octant s. 

 Aglantha digitalis has the sense organs only in alternate octants. 



Aglantha rosea is one of the oceanic medusae: it was found 

 by Forbes off the Shetlands and by Fowler (in 1896) in the 

 Faeroe Channel, so that it is likely to occur off the Bergen coast. 



Ptychogastria polaris. Allman. 



Plate IV. fig. 1 & 2, Plate V, fig. 6—8. 



Ptychogastria polaris, Allman, 1878, p. 290, fig. 1—3. 

 Pectyllis arctica, Haeckel, 1879, p. 226. 

 Pectyllis arctica, Haeckel, 1881, p. 10. Taf. III— IV. 

 Pectyllis arctica, Haeckel, 1882, p. 11. Pl. Ill— IV. 



This medusa was first described by Allman under the name 

 of Ptychogastria polaris. The description is based upon a solitary 

 specimen tåken by the '"Discovery" (Nares's Expedition) in Disco- 

 very Bay in Grinnell Land (Lat. 81.° 44/ N.) opposite the west 

 coast of Greenland. Haeckel saw this identical specimen in the 

 British Museum and states that it appears to be closely related to 

 his Pectyllis arctica. 



I have recently examined, at the British Museum, Allmax's 

 type specimen, and found his description and figures to be very 



