RHOPALONEMA VELATUM. 

 300 fathoms to surface ; 1 specimen. 



131 



Station 4695 



Station 4700; surface; 1 specimen. 



Station 4702 ; surface ; 1 specimen. 



Station 4706; surface; 1 specimen. 



Station 4710 ; surface ; 1 specimen. 



Station 4713 ; 300 fathoms to surface ; several. 



Station 4715; 300 fathoms to surface; 2 specimens. 



Station 4716; surface; 1 specimen. 



Station 4717; 300 fathoms to surface; 1 specimen. 



Station 4721 ; 300 fathoms to surface. 



Station 4722 ; 300 fathoms to surface. 



Station 4725 ; surface ; 2 specimens. 



Station 4728 ; 300 fathoms to surface. 



Station 4729 ; surface ; 1 specimen. 



Station 4731; surface; 1 specimen. 



Station 4732 ; 300 fathoms to surface ; 1 specimen. 



Station 4733 ; surface ; 1 specimen. 



Station 4734 ; 300 fathoms to surface ; 1 specimen. 



Station 4736 ; 300 fathoms to surface ; several. 



Station 4737 ; 300 fathoms to surface ; several. 



Station 4743 ; surface ; several specimens. 



Most of the specimens have only sixteen tentacles (PI. 45, fig. 11) ; a few 

 of the largest, however, 8-9 mm. in diameter, show the stumps of thirty- 

 two, as already noted by Vanhoffen (:02 b ) and by Browne (: 06). In none 

 could I distinguish more than eight otocysts, although Browne has shown 

 that sixteen is probably the final number of these organs. 



Rhopalonema velatum shares with Liriope tetraphylla the distinction of 

 being the most abundant Medusa of the expedition. It was previously 

 known to be very generally distributed throughout the warmer waters of 

 both Atlantic and Indian oceans; and the present collection, together with 

 specimens from the Hawaiian Islands and from Fiji shows that it is charac- 

 teristic of the entire Eastern Tropical Pacific. Although often taken in 

 vertical hauls, it is a typical surface form, there being no evidence that 

 it ever occurs below 100 fathoms (Browne, : 06). It is restricted to warm 

 waters. 



