532 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [20J 



Family PERIPHYLLID.E, Hseckel. 



Periphylla hyagtnthina,* Steen. 



Family EPHYRID^E, Hseckel. 



Ephyroides rotaformis, Fewkes. 



Several more specimens of this remarkable genus and species were 

 collected by the Albatross in 188G. Although all were in good condi- 

 tion as far as the bell and subumbral radial elevations are concerned, 

 the liner anatomy could not be made out. 



Ephyroides is characterized as follows : On the subumbral surface of 

 a thick umbrella there are radial elevations (in one specimen 32 in 

 number) which alternate with the marginal lappets. These elevations 

 are half cylindrical, sausage-shaped, radially situated, extending from 

 the margin of the umbrella at its junction with the marginal lappets 

 towards the center of the bell. They resemble on the subumbral side 

 of the umbrella the socles of the exumbral side, and lie in the radii be- 



*This species is common as far north as Greenland. The allied genus Nauphanta 

 somewhat resembles the young Periphylla, hut has eight sense bodies and eight ten- 

 tacles. It remains yet to he seen whether the young Periphylla has the same number 

 of tentacles and sense bodies as the adult. If it has eight tentacles instead of twelve 

 it may he readily conjectured that Nauphanta is a young Periphylla, and that im- 

 mature tentacles have been mistaken for sense bodies. 



I have elsewhere recorded a Nauphanta, N. polaris, Fewk., from Lady Franklin 

 Bay, North Greenland. 



'There seems to he a relationship between the cold waters of great depths of the 

 sea and'those of the cold waters of the Arctic Ocean. Temperature would seem to 

 play au important part in the relationship of medus;e from these two localities. 



