NEMATODE HAMATOZOA IN THE DOG. 273 
events, may be found in other tissues than those of the 
thoracic aorta and cesophagus. ; 
It is not deemed necessary to enter into any very minute 
description of the anatomical characters of the matured 
Filaria sanguinolenta as found in dogs in India, as these do 
not differ very materially from those of any other filarie 
which have been described by various writers from time to 
time. 
The figures in Plate XIII will, I trust, be sufficient to 
give a tolerably clear idea of the general appearance and 
internal anatomy of the mature entozoon when examined 
under the microscope; but it should be remarked that, in 
some instances, a higher power has been used to make out 
the structures than the extent of amplification stated opposite 
each figure would imply. To have drawn the figures to 
scale, as observed under higher powers, would have added 
greatly to the difficulties of reproducing them without adding 
materially to their value. Fig. 3 represents the mouth with 
its six, indistinctly marked, “lips,” and entrance to the 
pharynx as seen from the front. Fig. 2 represents the 
ventral aspect of the tail of the male with its two dissimilar 
spicules and four pre-anal papille—characters which, when 
taken in conjunction with the arrangement of the muscular 
tissues of the body, form the distinctive features of the genus 
Filaria (Schneider). There are also two post-anal papille, 
placed transversely to the body of the worm ; so that in all 
there are twelve papille, terminating on the inner surface of 
the alee which form the boat-shaped cavity on the ventral 
aspect of the coiled tail of the male. 
The well-marked curvature of the tail of the male, so 
common among the Fdaride, is, in this case certainly, due 
in a great measure to the strength and elasticity of the larger 
spiculum; when this is extracted the curvature loses its 
firmness. The alimentary tube runs parallel with the sper- 
matic tube, a sphincter-like constriction occurring on the 
course of the latter, separating the “vas deferens”’ from the 
“testis.” The “testis” consists of a tube extending up- 
wards in a serpentine manner until the junction of the upper 
with the middle third of the body and terminating cecally. 
The head of the female worm (fig. 1 a) does not differ 
from the head of the male, except that it is somewhat larger. 
The specimen delineated had been immersed in spirit, which 
had separated the chitinous cuticle from the other tissues ; 
so that the continuation of the former with the pharynx has 
been made very evident, the pharyngeal membrane being 
merely a reflection inwards of the skin; a similar reflection 
