208 THE ANATOMY OF IXVERTEBRATED ANIMALS. 



TiQ. 54— Prof ula Dysferi. A, the sexual, matjire animal, extracted from its calca- 

 reous tube : «, branchial plumes ; b. hood-like expansion ot the anterior end of ihe 

 body: c, the month; d, tlie stomach; e, the anu;* ;/, the testes ; g, the ova. B, 

 a Protula in conrse of proliferation; ft, the branchiae of the zooid. 



body, and its walls are very thick and muscular. At its an- 

 terior extremity it is surrounded with a circle of small papil- 

 lae, immediately behind which are four strong, pointed and 

 curved horny teeth, implanted in the muscular wall (Fig. 52, 



