6l 
dense white membrane, upon the secretions of which they feed, 
and these membranes are found more or less inflamed by their 
presence. 
"V allisneri has remarked, that Alexander Ti’allien, a famous 
Greek physician of the sixth century, relates the following anec¬ 
dote, which has an undoubted reference to these larvrn, that 
“ Democrites, an Athenian, being subject to fits of epilepsy, de¬ 
termined to consult the oracle at Delphos for a remedy, and 
received for answer, 
“ Quos madidis cerebri latebris procreare capeiia 
Dicitur humores, vermem de vertice longum.” 
An old man of eighty years, explained to him the fact of the 
existence of such worms, and pointed out the means of obtain¬ 
ing them by a sack tied about the nose of the sheep, into which 
they were received on falling from the sinuses. And this way 
also was employed by Vallisneri and Reaumur. 
When young these larvae; are perfectly white and transparent, 
except the two horny plates, which are black. As they increase 
in size the upper side becomes marked with two transverse brown 
lines on each segment, the anterior one shorter and narrower 
than the posterior ; and some spots are also seen on the sides. 
The body consists of eleven segments. See fig. 17- 
I procured about the middle of June some full-grown larvm of 
the GE. Ovis, from the inside of the cavities of the bone wdiich 
supports the horns of the sheep. They are nearly as large as 
those of the GE. Equi, of a delicate white colour, flat on the 
under side, and convex on the upper ; having no spines at the 
divisions of the segments as the Gastricolse, but are provided 
with tentacula at the small end. The other end is truncated 
with a prominent ring or margin, which serves the same purpose 
in an inferior degree as the lips of the GE. Equi and hasmorr- 
Q 
