2 34 



H ARC ITT. 



[VOL. II. 



were divided into symmetrical segments, the results showed 

 no less than thirty per cent of variation. On the variations 

 shown in their aboral confluence, or union with the gastric 

 pouch, the calculations gave 14.4 per cent. 



Of the entire number examined only a single specimen was 

 found having but two radial canals and two gonacls. These 

 were at an angle of 180 degrees, i.e., dividing the bell into two 

 symmetrical halves, as shown in Fig. 8, excepting alone the rela- 



FIG. 8. 



tive number of tentacles upon each half. One other specimen, 

 however, was found having only two canals, similarly disposed 

 and with a similar number and disposition of gonads ; but in it 

 there was a rather evident rudiment of a third springing from 

 the peripheral end of one of the canals, thus destroying the 

 bilateralism characteristic of the first. 



The largest number of canals found was six. This, while 

 much more common than those with two, was much less so 

 than specimens with three and five. Seven specimens in all 

 were found having this number, and in one of these the sixth 

 was clue to the evident forking of one of the five apparently 



