752 



ZOOLOGY 



SECT. 



liv 



cavity by the conspicuous excretory apertures already described. 

 On either side is an aperture (ap. 1} placing the cavity of the sac in 

 communication with the pericardium, and the right and left sacs 

 communicate with one another orally and aborally. From their 

 posterior junction is given off a median diverticulum (Fig. 680, 

 med. s), into which the pancreatic follicles (pane.) project. 

 Through each excretory sac runs the corresponding afferent branchial 



vein, formed by the 

 bifurcation of the vena 

 cava, and surrounding 

 it are masses of gland- 

 ular tissue (Fig. 679, 

 ven. app), by whose 

 agency the process of 

 renal excretion (the 

 products of which, in 

 the shape of a nitro- 

 genous excretory sub- 

 stance called guanin, 

 are to be detected in 

 vent the internal cavity) is 

 br.hl carried on. 



Reproductive 

 system. In the male 

 tketestis (Fig. 681, Jr.) 

 forms a compact mass 

 of minute tubules 

 situated in the aboral 

 region of the body 

 and enclosed in a 

 capsule. The single 

 spermiduct (v. clef.) is 

 a greatly convoluted 

 tube which leads from 



FIG. 680. Sepia officinalis, diagram of a median ,. , 



vertical section of a female specimen, to show the the Cavity OI the Cap- 

 relations of the cavities, ap. aperture between the i j- r . Tl; . QT .J c fU l a fj- 

 secondary body-cavity (pericardium) and the lateral 



nephridial sac : br. ht. branchial heart; coel. coelome; \4- /-\rpriG into an plnn 

 inf: funnel; ink. s. ink-sac ; int. intestine; lat. s. lateral 



nephridial sac ; liv. liver ; med. s. median nephridial sac ; orated VCSlCllld SCin I II - 



ov. ovary ; ov. ap. aperture leading from oviduct to & , . , 1 ' 1 



secondary body-cavity ; pane, pancreatic appendages ; ClllS (VCS.J, tO WhlCll IS 



sh. shell ; St. stomach: ur. ureter; rent, ventricle. aTYnaTM loJ rrlanrhil-ir 



(From Vogt and Jung, after Grobben.) append L a gianu 



body, the prosta I c 



(pr.). In the interior of the vesicula seminalis the sperms are 

 rolled up by the action of a system of grooves and ridges into 

 long narrow bundles of about 2 cm. in length, each of which 

 becomes enclosed by a chitinoid capsule of a narrow cylindrical 

 shape, forming a spermatophore (Fig. (582, B) ; at one end of 

 the spermatophore is a complicated apparatus of the nature 



coel 



ink.s 



