xn 



PHYLUM MOLLUSCA 



743 



liv.) or digestive gland is given to a large brown glandular mass which 

 extends from the neighbourhood of the salivary glands nearly to 

 the aboral end of the body. It consists of two partly united right 

 and left portions, each of which has a duct opening into the 

 cavity of the alimentary canal opposite the point where stomach, 

 caecum, and intestine meet. Surrounding the ducts and opening 



ma.TLl.ca.i-l 



FIG. 667. Sepia cultrata, female seen from the postero-ventral aspect, the wall of the 

 mantle-cavity divided along the middle line and the two flaps thus formed spread out so as 

 to expose the contents, ac. nid. accessory nidamental glands ; an. anal aperture with its 

 lateral appendages ; /. membranous fold attaching the ctenidium to the wall of the mantle- 

 cavity ; inf. external opening of funnel ; inf. cart, infundibular cartilage ; ink. d. ink-duct ; 

 ink. s. ink-sac ; lig. ligamentous band which extends from the anterior wall of the mantle - 

 cavity to the ovary, cut across ; liv. " liver " ; I. cten. left ctenidium ; I. neph. left renal 



\jCk\Lvy IAJ UI1C UTCU.J, l^UU C\yj.vn30 , -<l>. Al V ^i , _ 



aperture ; I. nid. left nidamental gland ; I. st. g. left stellate ganglion ; rnant. cart, mantle- 

 cartilage ; mo. rnouth ; mus. neck-muscles ; ov. ovary ; ovid. oviduct ; reel, rectum. 



into them are masses of minute vesicles (Fig. 670, b, d.) ; the 

 secretion of these has the property of converting starchy matters 

 into sugar ; they sometimes, though without sufficient reason, 

 receive the name of pancreas. 



