CEPHALOPODA 



593 



cavity of the organ contains a large amount of spongy excretory tissue, 

 developed round the veins which run straight through the kidney. 

 Just inside the renal papilla is a small rosette which carries the reno- 

 pericardial aperture. This leads into the long narrow renopericardial 

 canal running in the outer wall of the kidney and opening posteriorly 

 into the pericardium^ a wide space lying behind the kidneys which is 



dep.m. i^\ ^ 



an. 



Fig. 404. Sepia officinalis. Dissection from the ventral side to show kidneys 

 and blood vessels. Arrows show the direction of flow of blood, abd.v. ab- 

 dominal vein; a.ao. anterior aorta; au. auricle; ajf.v. afferent branchial vein; 

 br.ht. branchial heart ; eff.v. efferent branchial vein ; k.d. opening into dorsal 

 sac of kidney (see arrow); k.t. excretory tissue surrounding the vena cava; 

 pal.v. pallial vein; p.ao. posterior aorta; r.p.a. opening into kidney cavity of 

 the renopericardial canal, r.p.c; st.g. stellate ganglion; ven. ventricle; v.cav. 

 vena cava. Other letters as in Figs. 402, 403. Original. 



only separated by an incomplete partition from the still more spacious 

 genital coelom occupying the apex of the visceral hump (Fig. 405). 



The median ventricle and the two lateral auricles are spindle- 

 shaped bodies arranged in a line at right angles to the longitudinal 

 axis of the body. Arterial blood is sent to the body from the ventricle 

 by an anterior aorta running dorsal to the oesophagus towards the 

 head and ^. posterior aorta\ venous blood returns to the heart fro 





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