CCELOME 



391 



Ma. Kp Mm 



Ur.Gg 



Ma. Kp Msn 



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 (Nphs) only (Cestracion, Rhina, certain 



other Elasmobranchs before sexual maturity, larval Amia). 



B. Connection by means of nephostomes (Nvh*) and abdominal pores (Por.abd) 



(certain adult Scylliida3 and Spinacida?). 



C. Connection by means of abdominal pores (Por.abd) only (Carchariida3, 



Lamnidse, Batoidei, Holocephali, adult Ganoids, certain Dipnoi and 

 Salmonida?, Mormyridae). 



Cl, Clo, cloaca, Ma.Kp, Malpighian capsules of the meso^ephros (Msfi) ; Per^B^ 

 peritoneal cavity ; Ur.Gg > mesonephric duct.. 



