HERftLEA. 



again gradually regaining its former state. The true signification of this occasional isolation 

 of the gland seems pretty obvious. The alimentary matters, we know, pass pretty freely into 

 the principal vessels of the gastric system, and might, by any irregular action, be forced into 

 the minute and intricate structure of the gland, were it not for such an apparatus as that just 

 noticed, which is probably brought into action by the irritating influence of misdirected 

 currents within the gastric vessels. 



The stomach is placed far forward; and the intestine, which is very short, terminates in 

 a rather long tubular anus close in front of the heart. This latter organ is placed in a 

 considerable oval swelling on the mesial line of the back, and immediately behind the position 

 of the stomach. 



The eyes are well developed. In H. dendritica vibratile cilia were detected only in front 

 of the head, but probably they exist elsewhere. The reproductive organs have not been 

 examined. The larva (PL 40, fig. 7) in H. dendritica resembles that of JEolis coronata, but 

 perhaps still more closely that of Limapontia, as evinced by the minuteness of the ciliated 

 oral lobes. 



