102 F. G. HEATHCOTE. 
The Heart. 
The heart has been described by Bode, who saw the dorsal 
vessel dividing into three branches in the head, and also found 
an artery in the middle of each segment. The dorsal vessel is 
suspended from the dorsal hypodermis by suspensory muscles, 
and muscle-fibres connecting it with the fat bodies are attached 
to its ventral surface. These muscles form a sort of inter- 
rupted pericardium like that in Julus. 
In each segment of the body there are two pairs of ostia 
occupying the same position as those in Julus, but there is 
only one pair of arteries in the middle of each segment. The 
heart is composed of three coats, an intima or structureless 
internal lining, a muscular coat, and a cellular external cover- 
ing. The layers are not so well marked as in Julus; perhaps 
this is owing to the small size of the animal. The muscular 
valvular apparatus of the ostia is the same as that found in 
Julus (5). The circulation is connected, as in Julus, with the 
spaces in the fat-bodies. These spaces are often crowded with 
blood-corpuscles. There is no definite blood-space round the 
nerve-cord as in Julus. 
The Eyes. 
The shape of the lens is peculiar, and more resembles that 
of Scutigera (see Grenacher’s paper, 3) than that of any other 
Myriapod with which I am acquainted. Its external surface 
is highly convex, while the internal is flat. The cells of the 
hypodermis are continued round the circumference of the lens 
so as to form a kind of diaphragm. A section through the 
edge of the lens shows this (fig. 13, 4. ¢.). The crystalline 
cones are arranged in groups, so that a transverse section 
through the retinal depression gives the appearance shown in 
fig. 14, B. Ihave been unable to find any intrusive connective- 
cells, but this may be due to want of material. The pigment 
is thickest at the base of the retina, and also at the commence- 
ment of the rods (fig. 13, pgt., inner pgt.). 
