412 ON THE WYANDOTTE CAVE AND ITS FAUNA. 
between the teeth of the fish, should its direction be reversed or 
thrown backwards. The powerful jaw-arms, however, maintained 
like a steel spring a direction at a strong angle with the axis of 
the body, which was thrown upwards over the upper lip, the apex 
Fig. 111. of the cephalothorax being be- 
tween the lips of the fish. This , 
ji € 4 M position being retained, it be- 
( ZS comes a favorable one for the — 
ae B 
oe ati sustenance of the parasite, which 
is not a sucker or devourer of its 
on Avbipopets Pr ead eana ee host, but must feed on the sub- 
stances which are caught by the blind fish, and crushed between 
its teeth. The fragments and juices expressed into the water 
must suffice for the small wants of this crustacean. 
But if the supply of food be precarious, how much more so must 
be the opportunities for the increase of the family. No Fig. 1. 
parasitic male was observed in the neighborhood of the 
female, and it is probable that as in the other Lernwo- | 
podide, he is a free swimmer, and extremely small. ~ ulorenis 
must be augmented by the total darkness of his abode, jruzae more 
and many must be'isolated owing to the infrequent and ee 
irregular occurrence of the fish, to say nothing of the searceness 
of its own species. 
The allied genera, Achtheres and Lernewopoda, presen ; 
tinct distributions, the former being fresh water and the latter w 
rine. Lernæopoda is found in the most varied types of fishes an 
in several seas; Achtheres has been observed on perch from Asia 
t very dis- 
Fig. 112. and Europe, and on a South a 
ys Pimelodus. It is to the latter that 
and from 
loxenus is most nearly allied, mes 
Viewed from below, with av intro. 
lateral view of the cephalothorax. gy jts wanderin 
‘streams. The character which distinguishes it from 
one which especially adapts it for maintaining a firm 
host, i. e. the fusion of its jaw-arms into a single stem. 
Whether the present species shared with the Ambi ahi 
history and changes, or whether it seized upon the ee "eel 
at some subsequent period, is a curious speculation. Its 1° ae 
