﻿ix, d, 3 Light: Some Philippine Scyphomedusx 219 



with broad swollen ends, and are covered above and below by 

 shelves of tissue, the exumbrellar shelf being very short and the 

 subumbrellar much larger. No pigment spots are present. The 

 exumbrellar sensory pit it small, rather deep below, and dendrit- 

 ically grooved. It lies in the surface of an oval, papillalike, 

 raised area. The ocular lappets are short, plump, and closely 

 approximated, being 4 mm. in length from the base of the ex- 

 umbrellar sensory pit to the tip and 3 mm. in diameter. There 

 are from 70 to 80 complete marginal lappets, from 3 to 6 in 

 a paramere. Some of the lappets show a distal bifurcation. 

 The lappets are elongated, tentaclelike, tapering to a point. 

 They reach a length of 200 mm., measured from the inner 

 end of the cleft, are very slender and flexible distally, and have 

 the appearance of true tentacles. For about 25 mm. of their 

 inner length they are joined by a web. They are concave 

 below and convex above, with thin edges. They contain a 

 number of large longitudinal canals joined by small lateral 

 branches, and no muscle fibers could be detected in stained 

 sections. The velar grooves of the exumbrella are about 25 

 mm. and the ocular grooves are about 12 mm. long. The rhopalar 

 clefts are V-shaped rather than Y-shaped as in L. smithii. 

 From 24 to 32 radial canals, half of them rhopalar and half 

 interrhopalar, leave the central stomach. There are always 

 half as many sense organs as canals. The ocular canals extend 

 to the sense organs in the margin, but the interocular canals while 

 extending for some distance beyond the ring canal are lost in 

 the network of anastomosing canals before reaching the margin, 

 differing in this character from L. smithii. This is well shown 

 by injecting one of these canals with Delafield's haematoxylin. 

 There is a distinct ring canal about 45 mm. inward from the sense 

 club zone giving off an anastomosing system of canals internally 

 and externally, which connects with both the ocular and inter- 

 ocular canals but not with the central stomach. 



The bell between the arm disk and the ring canal is from 

 25 to 30 mm. in thickness, while from the ring canal to the 

 margin it is not thicker than 10 mm. The thickest point is 

 at the level of the ring canal, where there is a circular swollen 

 subumbrellar area over which the radial canals curve to meet 

 the ring canal whose greatest breadth is at right angles to the 

 plane of the subumbrella. At this point, just before it joins the 

 ring canal, there is a bulbous enlargement of each ocular canal. 



There is no radial muscle. The circular muscles form a series 

 of circular folds between the arm disk and the zone of the 

 sense organs. That part of the muscle band which lies within 



