368 
CLASS CRUSTACEA. 
globules, is directed forward in the form of a column, which 
is soon divided into four branches, two of which go directly 
towards the eyes, and two others towards the antennae ; these 
last branches, then reflected backwards, and united to the first, 
form on each side a single column, which descends towards 
the cupper, goes round its base, and disappears. A little un- 
derneath the two following feet, we distinguish on each side 
another sanguineous column, which is curved outwards, subse- 
quently extends near the edges of the testa, and, having ar- 
rived near the two penultimate feet, is bent forward, and ceases 
to be visible. Another column, in which the blood, as well as 
in the preceding, proceeds from front to rear, traverses the 
middle of the tail longitudinally ; it unites posteriorly to two 
other currents, which are observable on the edges of this tail, 
but proceeding in a contrary direction, or seeming to bring 
back the blood to the heart. The younger J urine has avoided 
the employment of the term vessel, because the blood driven 
into the anterior part, appears to spread and to be disseminated 
there, so as to countenance the notion that the globules of 
the blood are dispersed in the parenchyma of those parts, 
rather than contained in particular vessels. But after what 
we have said respecting the circulation of the decapods, it 
may be seen that in the present case the blood is at first dis- 
tributed in the same manner ; and the currents or columns, of 
which we have just spoken, appear to indicate the existence 
of peculiar vessels. Accordingly, we find this skilful observer 
afterwards allow that the circulation does not take place 
throughout, in a manner equally diffuse, as in the anterior part 
of the testa, where to us it appears to be effectuated as in 
the decapods. The brain, placed behind the eyes, appears to 
him to be divided into three equal lobes, one anterior and two 
lateral. The anterior part of the stomach gives birth to two 
large appendages, divided, each, into two branches, which 
ramify into the wings of the testa. The alimentary substances, 
