124 LOPHOPUS BRISBANENSIS, SP. NOV. 



The mouth of the European form is shown as a round 

 aperture : in the Brisbane form the mouth is seen as a long 

 slit in the floor of the vestibule, lying parallel to the 

 horizontal arms of the lophophore. As it opens a funicular 

 space, denseh' clothed with cilia, is revealed ; the base 

 opens by an oblique channel into the wide tube forming 

 the main portion of the gullet, a strong cup-shaped muscle 

 dividing it from the stomach. Here the food collects and 

 at intervals a muscular wave passes down the organ ; as it 

 reaches the sphincter relaxation ensues and the material 

 is forced into the stomach. 



The statoblast also differs from L. crystallinus and 

 L. lendenfeldi. In the former, there is an angle rising to a 

 sharp point at either end ; in the latter the form is a long 

 oval \\ith a smooth outline. In our species it is circular 

 in its early stages, becoming slightly oval at maturity, and 

 alternately sending out from each end about ten short, 

 serrated filaments of similar structure to that of the cells 

 of the annulus. The nucleus is large, brown, lenticular and 

 the annulus narrow and pale. 



PLATE III. 



Fig. 1. Colonies on root (natural size). 

 Fig. 2. Colony (x 6). 

 Fig. 3. Statoblasts (x IT). 



BIBLIOGRAPHY. 



Allmax : Polyzoa, Ray Society. 



Ridley : Lophopus hndenjeldi, P.L.S.N.S.W., xx, p. (il. 



Whitelegge: P.L.S.N.S.W., viii (1883), pp. 297, 416. 



