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 Jurine 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, 



