ENTOZOA 441 



Genus Apororhynckus, with the characters of the family. 



This family in the length and curvature of its lemnisci resembles the Giganto- 

 rhynchidae, and in the persistence of the embryonic condition of the nuclei in the 

 sub-cuticle and the lemnisci, the Neorhynchidae ; but in the shape of the body, its 

 division into three well-marked regions, the absence of eversible introvert, introvert 

 sheath, and hooks, it stands alone, though to some extent nearer to the Neorhyn- 

 chidae, in which the introvert is relatively small, the introvert sheath simple, and 

 the number of hooks reduced, than to either of the other families. 



The single species Apororhynckus hemignathi was found attached to the inner side 

 of the skin in the neighbourhood of the anus of a Sandwich Island bird, Hciiiignatlms 

 proceiiis. This bird is a member of a family Drepanididae, which is entirely confined 

 to the Sandwich Island group. Professor Newton tells me that it is probable that 

 the "food of He7iiignathus consists entirely of insects which it finds in or under the 

 bark of trees " ; hence it is probable that the second host of this parasite, if such 

 exists, must be looked for amon^jst the Insecta. 



(2) Echinorhynchus campamclahis Dies. 



Found by Dr Lutz in Water-rats. This species is said to be a facultative 

 parasite of man. 



The Zoological Laboratory, Cambridge. 

 March, 1 900. 



