452 A NEW ENTOZOON FROM THE EEL. 
drawn, or inverted. There are two ways in which I can revert the 
same. I may wish to do so by starting the tip end of the finger, 
as if I should push it out by pressing the end of a wire upwards, 
against the under side of the tip, which would in this way come 
out first: or I could, if I wished, push the finger out at the sides. 
This could be done, for illustration, by having in the hand part. 
of the glove a tube or cylinder.of the proper size, down which 
the glove finger has been neatly pushed, so as to fit snugly against 
the inner sides of the cylinder. Now if the cylinder be gently 
pushed upward, the glove finger will ascend on the outside of the 
cylinder having, as it rises, a crater-like depression at the top. 
The first of these methods illustrates the propulsion of the pro- 
boscis of Echinorhyncus gigas: and the second 
one shows the actual evolution of the proboscis 
of our new entozoon. It is done by the pushing os 
of abductor muscles on the sides of the everting 
and lengthening cone. i 
It is noticeable of our species, that when the 
proboscis is returned into the body, the hooklets 
are all turned inside the proboscis. Fig. 122, ¢ 
This is not true of Echinorhyneus, which keeps — 
its hooklets external to the proboscis, whether 
that organ is extruded or withdrawn. Figs. 
117118. 
Three real, and easily appreciab 
Fig. 121. 
Je distinctions 
helmin ? e 
They differ greatly in the form of the proboscl: 
also in the method of propulsion of the same, & method requiring 
for each differently adjusted muscles ; and they differ in oF wes 
tion of the hooklets, when the respective probosces are myer” 
It is plain then that our specimen belongs to a new 
As to their ordinal relations; both are membe 
second Class of the Entozoa, embracing the Sterelmint ; 
worms; and both evidently belong to Duvaine’s Tye 
thocephala, or Spiny Heads; and to Rudolphi’s 
ars the same name. Now in this order there is but one 5 
namely, Echinorhyncus, aJready mentioned ; therefore bai 
the order a new genus, to which we give the name ' 
ing *“‘sheathed-head” and species Anguilla, because 
common eel. 
rot Anguilla, wit 
proboscis projected, are now pointed out in these two 
showing the rings of 
hooklets, x 
found int 
