from Nyctereutes procyonides, 5 
portion is much larger than in any other individual, is white 
and shiny, the others all being of a dull yellowish colour, and 
very irregularly swollen. It presents the usual anterior de- 
pression ; but unfortunately this specimen was so brittle that, 
on cutting sections, the only point I succeeded in ascertaining 
was the presence of the regular canal. This swelling is most 
probably due to this individual specimen being more advanced 
in its development than the rest. 
Monier has shown (oc. cit. p. 41) that soon after their 
emigration into the peritoneal cavity the Cysticerct pisiformes 
uickly become immensely swollen, owing to the collection 
of fluid; and he expressly states, with reference to pl. i. fig. 2 
of his memoir, “ Les cysticerques, 4 cet Age, sont générale- 
ment renflés 4 la partie ot bourgeonne la téte.”’ 
On making a continuous series of longitudinal sections 
through the anterior extremity, one notices immediately that 
the depression mentioned above is the external orifice of a 
complicated canal terminating in a small blind extremity ; and 
in those sections that pass through the middle of this cavity, 
almost at the extremity furthest from the orifice there is a small 
prominence histologically different from the plications of the 
wall of the canal. Thisis the rudiment of the future Tenia. 
It consists of a dense mass of deeply staining tissue, which 
appears to consist of fibres radiating from the apex, and 
which is continuous with the muscular tissue of the rest of the 
Cysticercus (fig. 5). 
I have not been able to find any signs of hooklets; but 
there are four well-developed suckers (vide fig. 6) which lie 
out of the plane of a mesial section, but become visible in 
sections slightly away from that plane. ‘They consist of a 
very dense striated tissue, are continuous with the cuticle 
lining the canal, and are often covered on both surfaces by 
black pigment-granules. They appear to have originated 
by a special modification of the cuticle. This cuticle lines the 
whole of the canal, and is continuous with the cuticle covering 
the animal externally. 
_ The rest of the animal may be said to consist of three 
layers :—a central core composed of a cellulo-fibrous reticu- 
lum, many of the cells being strongly refracting, and known 
all through the Cestoids as calcareous corpuscles; this core 
is perforated in parts by vessels, which are particularly 
numerous in the tail, having a general longitudinal direction 
connected by transverse channels. ‘The core is enclosed by a 
muscular zone, consisting for the most part of longitudinal 
fibres. ‘This zone is very conspicuous in the tail, but be- 
comes less important in the anterior extremity, though still 
