CIRCULATION IN THE SEPIA. 24.3 



sufficient force through the gills, is provided with 

 a large and complicated- branchial apparatus ; and 

 the requisite power is supplied by two additional 

 hearts, situated on the venae cavae, of which they 

 appear as if they were dilatations, immediately 

 before the branchial arteries are sent off.* They 

 are shown at e, e, Fig. 355, which represents this 

 part of the vascular system of the Loligo, detached 

 from the surrounding parts ; the course of the blood 



being indicated by arrows, c is one of the three 

 trunks constituting the venag cavae, proceeding 

 from above, dividing into two branches as it de- 

 scends, and terminating, conjointly with the two 

 venous trunks (d), which are coming from below, 

 into the lateral or branchial hearts (e, e), already 

 mentioned. Thence the blood is conveyed by the 

 branchial arteries, (f, f), on each side, to the gills 

 (g), and returned, by the branchial veins, (i), to 

 the large central, or systemic heart (l), which again 



* These veins are surrounded by a great number of blind pouches, 

 which have the appearance of a fringe; the use of this singular 

 structure is unknown. 



