PACIFIC COAST OLIGOCH^TA. 

 SPECIES OF PONTODRILUS AND PHOTODKILUS. 



83 



In the above table T have principally followed Beddard, but I cannot agree 

 with his oj)inion as regards the identity of Grube's /■'. littoralis, with that of P. Marionis 

 of Perrier. As Perrier remarks, the ventral median papillae described by him in /^. 

 Marionis are not found in P. Uttoralis, in which species these papilla? were paired. 

 Until Grube's species has been found and redescribed we must therefore accept it as 

 a separate one. It is of course not by any means impossible that one or more species 

 of Pontodrilus are to be found in the same locality. 



In reference to the gizzard I have given it as rudimentary in two species. This 

 refers only to an anterior gizzard close behind the pharynx, in which the muscular 

 layer of the oesophagus is simply thickened as shown in fig. 46 A and b. Beddard says 

 that P. Uttoralis Grube has also a rudimentary gizzard, but I think that he judges by 

 M. Perrier's description of what I call a glandular crop in the somites posterior to the 

 testes. It may not be impossible that the muscular thickening of the oesophagus 

 really exi.sts in all the species more or less prominently, as it is ea.sily overlooked. 



