consists chiei'ly of four lozenge- shaped areas where the body 

 wall is very thin and pleated in radial folds. (s.g. Fig. 26.) 

 These thin parts of the body wall form the roofs of the subgen- 

 ital cavities, which open to the exterior, each by an eliptical 

 orifice in the side of the oral disk near the siibumbrella and 

 in the angle between two pairs of arms. The ovai'y appears as 

 a band crossing this membrane tangtntially at its greatest 

 width. Just central to etich ovary there is a multiple series 

 of very small gastric filaments. These are ciliated and pro- 

 vided with nettle and gland cells. I say "oA.'ary" because of 

 the many individuals that I examined, every one was without ex- 

 ception a female. It is a curious coincidence that of a num- 

 ber of specimens of Polyclonia that we found in the harbor near 

 Port Poyal all, on the other hand, were males. The portion 

 of the floor of the stomach not made up of these lozenge-shaped 

 membi-anes is bounded by the firm jelly of the oral disk. This 

 area has the shape of a Maltese cross, and it is in the arms of 

 this cross between the subgenital cavities that the passages 

 from the oral canals open into the stomach. Fig. 26. 



Near its periphery the floor of the stomach is marked by 

 radial grooves. These are continued, each into one of the 

 radial canals^ that extend outward from the edge of the circular 

 stomach to the marginal r^ion of the umbrella. There are 



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