216 ARTHUR E. SHIPLEY. 
moner species. N. agilis is found in Mugil auratus and M. 
cephalus; N. claveceps in the Carp, Cyprinus carpio, 
its larva form according to Villot! in the fat bodies of the 
Neuropterous insect Sialis niger; it has also been found in 
the alimentary canal of the leech Nephelis octocula, and 
specimens of the water-snail Limnzea have been articially in- 
fected with it. 
IV. Family Aruyncuip#. Short forms, with the body 
divided into three well-marked regions,—head, collar, and trunk. 
The head is pitted, the collar smooth, and the trunk wrinkled, 
not annulated—in spirit specimens. There is no eversible in- 
trovert, and no introvert sheath and no hooks. The sub-cuticle 
and the lemnisci have a few giant nuclei, and the lemnisci are 
long and coiled. 
Genus Arhynchus, with the characters of the family. 
This family in the length and curvature of its lemnisci re- 
sembles the Gigantorhynchide, and in the persistence of 
the embryonic condition of the nuclei in the sub-cuticle and 
the lemnisci, the Neorhynchide ; 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 Neorhynchide, 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 Arhynchus hemignathi was found 
attached to the skin around the anus of a Sandwich Island 
bird, Hemignathus proceros. This bird is a member of a 
family Drepanidide, which is entirely confined to the Sand- 
wich Island group. Professor Newton tells me that it is 
probable that the “ food of Hemigunathus 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 amongst the Insecta. 
Tue ZootocicaL LABORATORY, CAMBRIDGE ; 
March, 1896. 
1 «Zool. Anz.,’ Bd. viii, 1885, p. 19. 
