174 CALIFORNIA ACADEMY OF SCIENCES. 
body cavity is viewed from the interior surface. It is attached to the at this point 
very much thickened body-wall (fig. 158) by numerous muscles and connective 
tissue. The various species of Ocnerodrilus, especially those with short prostates, 
require reinvestigation in order to ascertain the structure of the prostates. Should 
intermediate forms be found it might become proper to merge the two genera into one. 
Nephridia. ‘Those anterior to clitellum are not covered with a ccelomie cell 
mantle, while those posterior to the clitellum are surrounded by a very thick one. 
The structure of the nephridia appears to be similar to those of Phwnicodrilus taste, 
at least in a general way. 
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