548 



cydippe: beroe. 



seems essentially to consist of Sensory Tentacles.* From the 

 cavity of the Stomach tubular prolongations pass-off beneath the 

 ciliated bands, very much as in the true Beroe (b); these may 

 easily be injected with coloured liquids, by the introduction of the 



Fig. 281. 



a, Cydippe pileus with its tentacles extended.- -b, Beroe For skalii, show- 

 ing the tubular prolongations of the stomach. 



extremity of a fine-pointed glass Syringe (Fig. 83) into the mouth. 

 In addition to the bands of cilia, the Cydippe is furnished with a 

 pair of Locomotive organs of a very peculiar kind ; these are long 

 Tendril-like filaments, arising from the bottom of a pair of cavi- 

 ties in the posterior part of the body, and furnished with lateral 

 branches (a); within these cavities they are often doubled-up, so as 

 not to be visible externally ; and when they are ejected, which often 

 happens quite suddenly, the main filaments first come-forth, and 



* It is commonly stated that the two branches of the Alimentary 

 Canal open on the surface by two pores situated in the hollow of the 

 fringe, one on either side of the Nervous ganglion. The Author, however, 

 has not been able to satisfy himself of the existence of such Excretory 

 pores in the ordinary Cydippe or Beroe, although he has repeatedly in- 

 jected their whole alimentary canal and its extensions, and has atten- 

 tively watched the currents produced by Ciliary action in the interior 

 of the bifurcating prolongations, which currents always appear to him 

 to return as from Csecal extremities. He is himself inclined to believe 

 that this arrangement has reference solely to the nutrition of the Nervous 

 ganglion and Tentacular apparatus, which lies imbedded (so to speak ) 

 in the bifurcation of the Alimentary Canal, so as to be able to draw its 

 eupply of nutriment direct from that cavity. 



