62 Journal of the Asiatic Society of Bengal. {|March, 1906. 
this kind are formed, the aperture being circular and not having 
stiffened edges. In Paludicella, in which the opening is rectan- 
gular but without a thickened rim, the resemblance is much more 
striking. In Hislopia there are no peculiar muscles connected with 
the orifice, the structure of which is absolutely distinct from that 
of the Cheilostomes. 
The tentacles are, as Carter says, “about sixteen,’ occasion- 
ally a little more numerous; but their number is not constant. 
Fic. 2, Diagrammatic longitudinal section of the orifice, 
the polypide being retracted. 
T.=thickened rim. P.V,=posterior valve. A.V,anterior valve. 
owing to their spherical shape, the action of the cilia brings them 
back into the gizzard again. I am inclined to believe that these 
bodies are merely food which is waiting to be crushed by the 
h 
gizzard, 
feces afterwards are green. If so, the animal is able to save up 
an excess of food for some time in this manner. The stomach, 
