A NEW NARCOMEDUSA FROM THE NORTH ATLANTIC. 



8l 



nate with 14 smaller tentacles ranging in length from 1 1 to 35 mm. 

 (The specimen in hand has only 27 tentacles, one of the smaller 

 series having failed to develop.) The insertions of the long set 

 of tentacles are farther upward (above the margin) and inward 



FIG. i. Pegantha c/ara, side view. The tentacles are represented on one side 

 only. Natural size. 



(toward the center) than are the insertions of the short tentacles. 

 The tentacles taper gradually to their pointed tips, and their 

 entodermal cores are composed of a row of chordate cells. 



The otolith-clubs appear to have been destroyed by the forma- 

 lin in which the medusa is preserved ; but there are 2-5, usually 

 3, long, slender, linear, somewhat tortuous, sensory tracts (oto- 

 porpae) which extend from the bell-margin about one half the 

 distance up the exumbrellar side of each lappet. 



The velum is simple, annular, and provided with powerful cir- 



FIG. 2. A portion of the margin of the subumbrella with the velum pressed out 

 flat, and showing gastric pouches, festoon canal, and the transparent bases of the ten- 

 acles between them. Natural size. 



cular muscles. The mouth is a simple annular opening at the 

 thick lenticular center of the subumbrella. 



At the margin of the stomach are 28 simple, unilobular sac- 

 cules which project downward into the bell-cavity, one in each 



