LOPHOPUS. 



167 



lies between mouth and anus just under the epistome. It gives off 

 a ring round the oesophagus and other branches. 



In allied species the trunk-coelom opens by paired ciliated canals 

 to the exterior near the anus. 



Fig. 96.— View of Entire Colony of Lophopus. 

 (After Allman.) 



Lophopus is an annual and dies down on the approach of winter. 

 It produces, however, before this event, a number of en capsuled buds 

 called statohlasts w'hich give rise to a fresh colony in spring. These 

 are not found in its marine aUies. (See page 61.) The colony is 

 produced by asexual budding from a single individual, hence metagenesis 

 occurs as in hydroid zoophytes. 



