NOTES ON AMPH1TKETUS. 



97 



2. Funnel and mantle-sac 

 cut open on the ventral side. 



3. Mantle-sac cut open on 

 the dorsal side. 



Both figures partially con- 

 structed. 



an., anus. 



ao., aorta cephalica. 



a. v., abdominal vein. 



b. a., branchial artery. 



b. h., branchial heart with 

 small pericardial gland. 



b. v., branchial vein. 



d. L, depressor infundibuli. 



/. o., funnel organ (Trichter- 

 organ). 



0: gill- 



g. 8., gill Suspensorium. 

 i. b., ink-bag. 



I. b., lateral baud with gang- 

 lion stellatum. 



/. i. f., lateral infundibular 

 fold. 



I. m. o., left mantle opening- 



l. v., lateral vein. 

 ov., ovary. 

 ovd., oviduct. 



r., renal organ. 

 r. m. o., right mantle open 

 ing. 



r. o., renal opening. 

 s. h., systemic heart. 

 st., stomach. 



v. m. s., ventro-median sep- 

 tum. 



Woodcut 2. 



