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 clitellura are not covered with a coeloraic 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 Phcenicodrilus taste, 

 at least in a general way. 



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