716 



ZOOLOGY 



SECT. 



The coelome (Fig. 634) is a pouch of considerable size, divided 

 by a constriction into oral and aboral parts. The former is the 

 i_H' riccwdiutn or cavity in which the. heart is lodged ; it gives off 

 a pair of diverticula, right and left, each lodging the corresponding 

 branchial heart. The aboral part of the coelome forms the capsule 

 which encloses the ovary or testis. 



r.a.bd.'V 



le. 



Fi<;. <;_>">. Sepia cultrata, imfe specimen seen from the posterior aspect, the mantle-cavity 

 opened as in Fig. 621, the posterior body-wall partly dissected off, so as to expose the organs 

 in the visceral sac, the ink-sac and duct removed, aort. main aorta ; aort.' aboral aorta : 

 a/>i>. appendage of left branchial heart ; we. caecum ; inf. cart, funnel cartilages ; li-c. liver ; 

 /. aliil. r. left abdominal vein ; /. aft; br. left afferent branchial vessel ; /. tun: left auricle ; 

 /. /</. ht. left branchial heart; /. cttn. left ctenidium; /. st. g. left stellate ganglion; -mitdt. 

 furt. mantle cartilage ; pen. penis ; proxt. prostate ; r. ahil. v. right abdominal vein ; r. etui. 

 right ctenidium ; r. ><. ,,./,/,. appendages of right afferent branchial vessel; te. r. vein to 

 testis ; ra. valve of mantle ; rent, ventricle., 



- -The paired, plume-shaped ctenidium lies parallel with the long 

 axis of the body. It is attached throughout the greater part of il 

 length to the wall of the mantle-cavity by 'a thin muscular fol< 

 It consists of numerous pairs of delicate lamellae, the surface 

 which is increased by the presence of a complex system of foldm 



