722 



ZOOLOGY 



SECT. 



a nerve derived from a small ganglion situated close to the 

 optic ganglion. A small elevation, covered with papilla?, on the 

 floor of the buccal cavity, just in front of the odontophore, is 

 perhaps an organ of taste. 



The excretory organs of Sepia (Figs. 633 and 634) are a pair of 

 thin-walled sacs, which open into the mantle-cavity by the con- 

 spicuous excretory apertures already described. On either side is 

 an aperture (p. 1 } placing the cavity of the sac in communication 



I'.CCIV 



Clll.T; 



med.s 



FIG. 033. Sepia officinalis, renal organs. ///. ,\ abdominal vein ; f/ji, funnel-like opening 

 from the pericardium ; <i/i-. aperture of communication between the left and the median 

 nephridial sac; ink. . <'. ink-sac vein ; nie<i. s. median sac; pal/. <. pallial vein ; ur. ureter; 

 '. '<. vena cava ; yen. //' venous appendages of the afferent branchial veins. (From Vogt 

 and Jung, after Grobben.) 



with the pericardium. The right and left sacs communicate with 

 one another anteriorly and posteriorly. From their posterior junc- 

 tion is given off a median diverticulum (Fig. 634, mcd. s), into 

 which the pancreatic follicles (pane.} project. Through each ex- 

 cretory sac runs the corresponding afferent branchial vein, formed 

 by the bifurcation of the vena cava. Surrounding the vessel are 

 masses of glandular tissue (Fig. 633, rcn. i.'pp), by whose agency the 

 process of renal excretion, the products of which, in the shape of 

 unites, are to be detected in the internal cavity, is carried on. 



