PROTEOdEPIIALUS GALLARM. 177 
which though individually small are yet very numerous, and form 
a distinct and almost continuous narrow layer. The subcuticular 
cells are situated inwardly from these fibres, and between the cells 
one may readily recognise the inner series of subcuticular longi- 
tudinal muscles. The fibres are much larger and form small 
bundles. This series merges into another lying within it, and con- 
sisting of much larger bundles composed of larger fibres. The 
latter musculature spreads over a fairly wide area of the cortex 
lying within the subcuticular cells, and terminates at some little 
distance from the inner parenchyma muscles. They thus represent 
an outer series of longitudinal bundles. Separated externally from 
this by a narrow track free from muscular tissue, there lies the 
powerful inner longitudinal series consisting of numerous bundles 
varying in size and in the number of individual fibres contained in 
them. Although one may recognise an inner and an outer division 
in the middle region of this series, yet they really form one con- 
tinuous ring. It isi this musculature which makes the inner 
boundary of the cortex, as no transverse fibres were detected 
within it, though some were present, weakly developed, on, the 
outer side of it. The relation of certain other structures to this 
longitudinal muscle ring may be mentioned here. The lateral 
nerve lies in line with or slightly outward from the lateral portion 
of the system, the vitelline glands being just dorsal to the nerve, 
both structures thus forming a part of the ring, as will be seen 
by glancing at Fig. 3. The excretory vessels lie very clo'se toi and 
sometimes actually between the bundles of their respective sur- 
faces. There is no marked displacement of the bundles laterally 
by the genital ducts as they pass between them. Dorso -ventral 
fibres were not recognised. 
The excretory system consists of the usual two pairs of longi- 
tudinal vessels, but transverse commissures are absent. The 
ventral trunk is somewhat larger than the dorsal, which lies 
directly above it. Each approaches very closely to the muscle 
bundles of the corresponding surface. The nerve lies laterally 
immediately below the vitellaria, and as previously mentioned is 
situated just outside of the inner musculature. The genital canals 
displace the nerve slightly towards the dorsal surface as they 
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