292 



DISCOVERY REPORTS 



extend only about half way down the subumbrella ; in the adult the lips have some few 

 large folds, and the lobes of the stomach reach nearly to the ring canal, tapering off 

 towards the distal end and terminating in a broad radial canal. In their proximal part 

 the lobes are very broad, and they are in open connection with the central cavity of the 

 stomach and not separated from it by longitudinal folds as in Laodicea undulata (see 

 Kramp, 1919, pi. ii, fig. 2). The gonads form a series of short folds extending, in the 

 adult, from near the centre of the stomach, along the lobes, almost to the ring canal 

 (Plate XVI, fig. 4). They are situated on both sides of each lobe where it is attached to 

 the subumbrella. In the smallest specimen the gonads are just beginning to develop, as 

 a few folds near the distal end of the lobes of the stomach. 



The basal bulbs of the tentacles are slightly longer than they are wide, somewhat 

 flattened on the abaxial side, but convex on the adaxial side. There is no basal spur, as 

 found in L. undulata. The tentacles are about as long as the radius of the umbrella, 

 spirally coiled when contracted. Nematocysts in densely set transversal wrinkles, 

 which are the most numerous on the adaxial side of the tentacle, fewer and more 

 prominent on the abaxial side. Moreover, in a contracted state there are deep trans- 

 versal folds on the adaxial side. It is important to note that cirri are not present in any 

 of the specimens. 



The sensory clubs or cordyli (Plate XVI, fig. 5) are large, i-| mm. in length, club- 

 shaped, without nematocysts. The number present between every two tentacles varies 

 from one to five, but generally three or four are found. Each cordylus is situated on a 

 bulb, which varies in size, and as a rule the central bulb between each pair of tentacles 

 is the largest. At the base of each bulb, on the inner side, close to the velum, there is a 

 black ocellus (Plate XVI, fig. 5), which makes its first appearance soon after the bulb 

 begins to develop. The intermediate stages of the medusa clearly show that some of the 

 bulbs, upon which the cordylus is situated, increase in size and become basal bulbs 

 bearing a tentacle. The cordylus remains until the bulb has nearly reached its full 

 growth, and disappears when the tentacle begins to develop from the bulb. The cordylus 

 is always at the apex of the bulb, and a sufficient number of stages of growth are 

 present to show that the cordylus is not pushed out of position by the growth of another 

 bulb to carry the tentacle. 



The following table shows the size, the number of tentacles, and the number of 

 cordyli of the specimens taken : 



