62 MARINE ANIMALS OF MASSACHUSETTS BAY. 



arising from it a very diiferent and much sharper curve than 

 they have in the Zygodactyla. In the Tima they start from the 

 end of the proboscis, as may be seen in the wood-cut (Fig. 76), 

 and then turn abruptly off, when they arrive at the under surface 

 of the disk, to reach its margin. The disk has, as usual, its veil 

 and its fringe of tentacles ; the tentacles in the full-grown Tima 

 are few, — seven in all the four intermediate spaces between the 

 tubes, with one at the base of each tube, making thirty-two in 

 all. The ovaries, which are milk-white, follow the line of the 

 tubes, as in the Zygodactyla, and have very undulating folds 

 when full of eggs. The tubes meet in the digestive cavity, 

 j,jg 7g the margin of which 



spreads out to form 

 four ruffled edges that 

 hang down from it. 

 One of these ruffles, 

 considerably magni- 

 fied, is represented 

 in Fig. 77. In Fig. 

 78 we have a portion 

 of the Hydroid stock 

 from which this Jelly- 

 fish arises, also great- 

 ly magnified. The 

 Tima is very active, 

 yet not abrupt in its 

 motions ; but when in good condition it is constantly moving 

 about, rising to the surface by the regular pulsations of the disk, 

 or swimming from side to side, or poising itself quietly in the 

 water, giving now and then a gentle undulation to keep itself in 

 position. 



Though not a very frequent visitor of our shores, the appear- 

 ance of the Tima is not limited by the seasons, since they are 

 found at all times of the year. It is a fact, unexplained as yet, 

 that the Tima and many other Jelly-fishes are never seen except 

 when full grown. What may be the haunts and habits of these 

 animals from the time of their hatching till they make their 



^ Fig. 78. Magnified head of Hydrarium of Tima. 



