PRIAPULOIDBA. 541 



generative cells from their lining epithelium, and the renal caeca 

 are branched and ciliated, and terminate in pear-shaped cells, which 

 contain a long, flame-shaped cilium projecting into the lumen of the 

 canal. It therefore appears that in the Priapuloidea the generative 

 glands are continuous with their ducts, and not connected in any way 

 with the body-cavity ; while the renal organs resemble those of the 

 Platyhelminthes. 



The sexes are separate, and the development is unknown. 



Fam. Priapulidae. With the characters of the group. Priapulus Lam., 

 Halicryptus v. Sieb., both found in the North Sea. 



