202 



NANOMIA CAEA. 



down, and forcing the water in or out of the cavity of the bell. From 

 the abactinal pole of this cavity diverge four chymiferous tubes, which 

 lead into a circular tube, connecting them all (c, Fig. 334) ; two of these 

 tubes, t', t', are straight, and run directly from the point of junction of 

 Jig. 333. the four tubes {j, Fig. 334) to the circular tube, 



while the other tubes, t, t, wind round before 

 joining the circular tube. The connection of 

 these chymiferous tubes with the tube into 

 which they run, and which connects them all 

 with the main cavity of the axis of the commu- 

 nity, can readily be traced by combining the 

 different views of the swimming-bell here given. 

 (Figs. 333-336.) In Fig. 333 the straight chy- 

 miferous tubes run perpendicularly to the circular 'tube, in continuation 

 of the tube passing through the abactinal pole of the spherosome ; 

 while in Fig. 336, which is a view at right angles to that of Fig. 333, 

 we see the connection of the winding tubes with the connecting tube ; 

 the opening (/, Fig. 335) of the connecting tube {t", Fig. 335) is some- 

 what to one side of the point of junction of the chymiferous tubes 



(j, Fig. 334), as is readily seen on examining Figs. 335, 336. Fig. 336 

 shows the wing-like expansions of the spherosome which clasp the axis, 

 giving the Medusa a conical appearance, when seen from that side ; 

 while when seen from the actinal or abactinal pole, as Figs. 334, 335, 



Fig. 333. Swimming bell of Nanomia, seen facing the side of the straight chymiferous tubes. 



Fig. 334. The same bell, seen from the actinal pole, somewhat more magnified, i, t, bent chy- 

 miferous tubes ; t\ t', straight chymiferous tubes ; c, circular tube round veil ; J, point of junction 

 of the four chymiferous tubes. 



Fig. 335. A portion of the same bell, seen from the abactinal pole ; lettering as in Fig. 334. 

 f, opening of tube, (", leading into the main axis connecting with one of the straight chymiferous 

 tubes. 



