738 J. n. ASHWORTH. 



close affinity witli the latter species, for it was at once seen 

 that the New Zealaiid specimen possessed multiple oeso- 

 ph:igeal glands and that there were no pouches on the first 

 diaphragm — two features known only in, and considered to 

 be almost diagnostic of, A. claparedii. At first, also, only 

 five pairs (the number occurring in A. claparedii) of 

 nephridia were seen in the Otago specimen, but finally a 

 much reduced pair was found in the segment anterior to the 

 one beai'ing the first fully developed nephridia. In the 

 other three specimens sent by Professor Beuham there are 

 six pairs of fully developed nephridia, which is evidently the 

 normal condition. The lateral lobes of the prostomium of 

 these specimens were found to be more feebly developed than 

 those of A, claparedii. There were therefore two points 

 in which the southern specimens agreed with Levinsen's 

 species, viz, the presence of multiple oesophageal glands and 

 the absence of diaphragmatic pouches; and two features in 

 which they differed, viz. the form of the lateral lobes of the 

 prostomium and the number of nephridia. 



On sectioning the anterior end of one of the Otago speci- 

 mens a pair of large otocysts was found, each opening to the 

 exterior by a narrow tube. The presence of these well- 

 developed organs, in conjunction with the important differ- 

 ences above mentioned, finally settled that the New Zealand 

 specimens do not belong to the species A, claparedii, in 

 which the al)sence of otocysts is so characteristic and 

 remarka])lc a feature. 



These specimens agree with A, marina in the number, 

 position, and character of their gills, in the number of their 

 nephridia, and in the general anatomy of their otocysts; but 

 the southern specimens are clearly distinguished from 

 A, marina by their niulti])l(! oesophageal glands, by the 

 absence in the former of diaphi-ngmatic jiouches, and by 

 other less obvious featui-es. 



The only other known species to which the New Zea- 

 land specimens show any close similarity is A. assimilis, 

 Ehlers (181>7, pp. 103, 104), of which only the external 



