84 



EUCOPE DIAPHANA. 



short proboscis, and an extremely attenuated disk, as in Fig. 118. Fig. 



119, which is a still more magnified view of a quarter of the disk, seen 

 Fig . 118 . from above, shows the extraordinary increase of 



the number of tentacles, and the position of the 

 genital organs near the circular tube. As the 

 Medusas become older, a sort of sensitive bulb is 



formed at the base of the tentacles, in which a little pigment matter 



is accumulated (6, Fig. 120) ; this bulb is hardly perceptible in younger 



Fig. 119. 



Fig. 120. 



Fig. 121. 



tentacles, and is totally wanting in the young Medusae. The original 



number of the capsules between every two chymiferous tubes is not 



changed as the tentacles become more numerous ; in adult specimens 



(Fig. 119) there are only two to be found, as in the 



youngest Medusae, just escaped from the calycle. When 



examining a part of the circular tube of a Eucope 



somewhat more advanced than the stage represented in 



Fig. 117, we find only a great increase in the sensitive 



bulbs and the root of the tentacles (r, Fig. 120), but 



we can perceive nowhere, in any of the most advanced 



tentacles, the least trace of additional capsules, such as 



are found in the two tentacles, ', #', Fig. 116, and #', 



Fig. 120. The capsules (c, Fig. 120) have the same 



shape and position they had in younger Medusae. The 



genital organs, at first mere swellings of the chymiferous 

 tubes (Fig. 117), soon develop into regular pouches, 

 which hang down on both sides of the tube ; the tube 

 also forms a sort of pocket at the point of attachment 

 of the pouch, (a, a", a'", Fig. 121.) This pocket is read- 

 ily seen in the male (Fig. 121) ; its shape, when seen 

 from above, changes considerably according to the position of the 

 genital pouch, (a, a", Fig. 121.) The shape of the spermaries has 



Fig. 118. An adult Eucope diaphana, seen in profile. 

 Fig. 119. A quarter of Fig. 118, more magnified. 



Fig. 120. Magnified view of the circular tube of a young Eucope. 5, sensitive bulb ; r, root 

 of tentacle ; c, capsule ; ?', tentacle with capsule. 



Fig. 121. Spermaries ; a', seen from above ; a", in profile ; a"', different attitude from above. 

 Fig. 122. Female genital organs. 



Fig. 122. 



