NO. 1772. ANNELIDS OF THE ARENW0LID.E—A8HW0RTH. 9 



Grube's record of "Arenicola piscatorum Cuv." from Callao is a 

 mere mention of the name without any comment whatever. In the 

 hope of finding this specimen I wrote to Professor Levinsen, of the 

 Museum of Copenhagen (in the publications of which museum the 

 record was pubhshed), but he informs me that he can not find any- 

 corresponding specimen in the museum collection. I have therefore 

 no means of verifying or amending this record by reference to the 

 actual specimen, but I consider that, as a record of A. marina, it 

 should be only provisionally given. It is equally, if not more, 

 probable that Grube was dealing with one of the species externally 

 closely similar to A. marina, for instance, A. da'paredii.^ 



Ehlers records A. marina from Puerto Montt, Chile. Fortunately, 

 the two specimens on which the record is based have been kept. I am 

 indebted to Professor Ehlers and to Doctor Michaelsen of the Natur- 

 historisches Museum, Hamburg, to which institution the specimens 

 belong, for the opportunity and permission to examine them. The 

 worms are both dark colored, nearly black and badly preserved, 

 123 and 110 mm. long, respectively; the longer one is apparently 

 incomplete, the posterior end of the tail being absent. In the number 

 of their segments and the number and position of their gills, almost 

 the only external characters available for reference, these specimens 

 agree with A. marina, but on examining the internal organs of one of 

 them which had already been partially dissected, it was evident that 

 the specimen could no longer be referred to this species. Ten oeso- 

 phageal glands are present on each side ; there are no pouches on the 

 first septum, and statocysts could not be found in spite of most careful 

 search. The internal organs of the other specimen were also examined ; 

 'seventeen oesophageal glands are present, but no septal pouches' and 

 no statocysts. The anterior region of one of the specimens was cut 

 into serial sections, but statocysts could not be found. Had these 

 vesicles been present in the living animal they would have been 

 recognizable even though the tissue was so badly preserved. We 

 may conclude that these specimens do not posses statocysts and that 

 they belong to the species A. claparedii, the only species in which 

 statocysts are absent. The gills, though not in a good state of preser- 

 vation, are of the pinnate type and the neuropodia of the posterior 

 branchial region are broad cushions not nearly reaching the mid- 

 ventral line; both these characters confirm the diagnosis previously 

 reached. The lobes of the prostomium are not sufficiently well 

 preserved to be of service in diagnosis. Both these specimens are 

 remarkable in that they possess six pairs of nephridia, while typical 

 specimens of A. claparedii have only five pairs. Each of the first 



o See footnote <= on page 8. 



