8. UROPHYSIS AND CAUDAL NEVROSECRETORY SYSTEM
405
Fig. 4B
judging the systematic significance of urophysial morphology ( Fridberg,
1963; McLean, 1965).
2. ELASMOBRANCHS
In elasmobranchs, the universally huge secretory neurons (Fig. 4) are
equipped with dendrites and generally a principal short axonal process