REPORT ON THE DEEP-SEA MEDUSAE. 41 



Sub-family, ^Eginukid^, Hseckel, 1879. 

 iEginidse with eight peronial double canals (four perradial and four interradial). 



sEginura, 1 Hseckel, 1879. 



iEginidse having eight peronial double canals and eight tentacles (four perradial 

 and four interradial), and also sixteen intern emal reproductive pouches, alternating in 

 pairs with the eight tentacles. 



The genus JEginura shows twice as many tentacles and reproductive pouches as 

 the well-known primitive genus of the iEginidas, ^Egina. The ^Eginura myosura, 

 which I am about to describe, is the only species of this genus, and also the only 

 species of iEginidag of the Challenger collection, of which I can give a satisfactory 

 account. A second species of this family, much larger, and of more complicated struc- 

 ture, which I placed in my System, 1879, as sEginorhodus rosarius (p. 345), proved 

 on closer examination too much destroyed and badly preserved for any satisfactory 

 description. I am even dubious if the diagnosis of the species taken from this fragment 

 be correct. 



JEginura myosura, Hseckel (Pis. XIII., XIV.). 



JEginura myosura, Hasckel, System der Medusen, 1879, p. 343, taf. xix. figs. 8, 9. 



Umbrella cap-shaped, twice as broad as high. Mouth quadrate or four-lobed, with 

 cylindrical oesophagus half as long as the radius of the umbrella. Sixteen almost 

 rectangular reproductive pouches, the two medial of each quadrant smaller than the two 

 lateral. Eight tentacles alternately different ; the four perradial larger, and inserted 

 higher than the four interradial ; the former nearly double the length of the radius of 

 the umbrella, the latter the same length. Horizontal diameter, 30 mm. ; vertical 

 diameter, 15 mm. 



Habitat. — Indian Ocean, south of Australia. I found a male specimen of this species 

 somewhat damaged, but still pretty well preserved, in a bottle of the Challenger collec- 

 tion, containing numerous Phseodaria (Atdosphera, Ccelodendrum, &c.) from Station 

 159. Lat. 47° 25' S., long. 130° 32' E. 10th March 1874. Depth (apparently) 2150 

 fathoms. In the System der Medusen (p. 343), "Weber" was given by an oversight 

 instead of " Challenger." 



The umbrella (PI. XIII. figs. 1, 2 ; PL XIV. fig. 11) has the shape of a flat cap or 

 biretta ; the upper surface flattened nearly horizontally (slightly depressed in the 

 middle), whilst the side walls stand almost vertically (slightly widened below). The 



1 JEginura, nonien proprium. 



(ZOOL. CHALL. EXP. PART XII. 1881.) M G 



