CCELOME 



Ma.Kp 



391 



Ur.Qg 



Ma.Kp Msn 



B 



Ur.Gg 



Ma. Kp Msn 



C 



FIG. 297. DIAGRAMS ILLUSTRATING THE THREE POSSIBLE WAYS IN WHICH THE 

 PERITONEAL CAVITY MAY COMMUNICATE WITH THE EXTERIOR IN FISHES. 

 (After E. J. Bles). 



A. Connection by means of nephostomes (Xphs) only (Cestracion, Rhina, certain 



other Elasmobranchs before sexual maturity, larval Amia). 



B. Connection by means of nephostomes (X-ohn) and abdominal pores (Por.abd) 



(certain adult Scylliida? and Spinacidse). 



C. Connection by means of abdominal pores (Por.abd) only (Carchariidae, 



Lamnida), Batoidei, Holocephali, adult Ganoids, certain Dipnoi and 

 SalmonidEe, Mormyridae). 



Cl, Clo, cloaca, Ma.Kp, Malpighian capsules of the raesonephros (Man) ; 

 peritoneal cavity ; Ur.Gg, mesonephric duct. 



