siu. aie 
x 
and in organs entirely dissimilar. Lamarck gives instances of — 
individuals found in the lungs of the hare, the liver of ‘the 
goat, urinary bladder of the frog, human ovary, anterior tibial 
vein of man, and frontal sinus of the dog and horse. They 
have also been found in the throat of the Champsa sclerops, 
lungs of Crocodilus acutus, and the intestines of various 
fishes. As regards their habitat the Linguatule are some- 
what remarkable. For the most part the species of the dif- 
ferent genera of Entozoa are confined to certain classes of - 
Organs or tissues.  "Twnie, Echinorynchi, Ascarides, and 
others, as a general rule, infest the intestinal canal; Cysti- 
 Cercus. ‘the aveolar tissue ; Trichina, the muscular, &c. But 
rarely do we find the species of a genus so widely diffused, in 
such different tissues, as those belonging to that under con- 
. sideration. The presence of hooks about the mouth would 
seem to indicate that a free surface was the habitat most 
Congenial to’ their organization, and such is the fact as re- 
gards most of the species. The anatomy of Linguatula tæ- 
nioides has rer completely described and figured by Owen' 
and Diesin 
# bem. ARMILLATA. Pl. XV. Fig.3. Body cylin- 
areal, slightly flattened on its inferior face, and surround- 
d by about twenty distinct rings, separated from each other 
€ wide interval. The length of the different specimens, 
- all of which were fe : les, varied from three and a half to four 
: E. 
a inches ; the greatest diameter being about four-tenths of an 
ads The rings, which form the most puo pe Cdi n 
` The head is homer — $4 and on the in- 
T : omg Soc. Vol. I. p. 235. ; 
ee da gen re Pentastoma. Annales Mus. de Vienne, Vol. L, 
E 
two Species of Linguatula. = 295 s 
* 
A 
we 
