Sanations Aynot^g Scyphomedusce. 



569 



number is given, as in the first line of Table V the fact in relation 

 to the canals is shown by the o, indicating their absence. Where 

 a larger number than the normal is present, as in the fifth line and 

 those following, the figure 2 in the perradial canals indicating 

 that the extra rhopalium is perradially located. In other words, 

 the figures in the columns under rhopalia and canal system serve 

 to show the correlation of the two sets of organs. 



As indicated above, the tables give no account of the adradial 

 canals, since normally they sustain no direct correlation with the 



Fig. 9. Ephyra with three compound marginal lobes, quite comparable with those of Figs, i to 3. 

 Fig. 10. Ephyra with two mouths, and opposite compound marginallobes. 



other canals or with the rhopalia. It must be said, however, that 

 there are definite exceptions to this rule. And while not suffi- 

 ciently numerous to call for tabulation along with the others, 

 they occur in too many instances to warrant the somewhat ultra 

 pronouncement of Browne ('oi, p. lOo) to the contrary. Whether 

 a given canal shall be called adradial, interradial, or perradial 

 depends not alone on its position or whether it be branched or 

 otherwise, but upon both its position and relations to the other 

 canals. The name signifies nothing in itself but that of relation- 

 ship. There is no intrinsic reason why an adradial canal should 



