54 LIVERPOOL BIOLOGICAL SOCIETY. 
to the end of the dorsal blood vessel in the very last somite 
of the body. The cells are few in number until the 
posterior end of the gizzard is reached, then they suddenly — 
increase very greatly in amount. They entirely surround - ) 
the intestine throughout the greater part of its length. j 
At the beginning of the last quarter of the intestine the | 
cells rather sharply diminish in number, and appear only 
on the dorsum of the intestine in proximity to the dorsal : 
blood vessel, and surrounding the lateral branches of | 
that vessel. Finally they exist merely as a streak on’ the 
median dorsal line until the last somite is reached. 
In colour the cells are from orange to a dark yellowish 
brown. 
The cells which surround the intestine directly posterior 
to the gizzard may be divided, according to colour and 
arrangement, into three distinct areas. | 
(a) A mass of cells directly surrounds the dorsal blood 
vessel, and is continuous with those surrounding the 
blood vessel more anteriorly. 
(6) On the dorsum of the intestine, and radiating | 
outwards from the cells surrounding the dorsal blocd | 
vessel, and passing down the sides of the intestine, are, in 
each somite, two pairs of cellular masses, of a dark orange 
or brown colour directly behind the gizzard, but becoming 
lighter in colour backwards, until in the posterior somites 
of the body they become the same colour as those of the 
dorsum. 
(c) Further, more ventrally placed on either side of the § 
intestine, there is one distinct mass of light yellow colour. § 
Just behind the gizzard the cells do not cover the 
inferior surface of the intestine, but they do so a little 
further back, the two ventrolateral masses in each somite 
being separated by the sub-intestinal blood vessel, which § 
is (unlike the dorsal vessel) not imbedded in the cellular 
