PLATE 7. 



45 



5.CC 



WORMYRUS 



Accessory auditory organs of Carp, Gymnotus, Herring and Mormjrrus. 

 W. — Wall of auditory vesicle. S.B. — Swim-bladder or buoyancy tank. A.V. — 

 Auditory vesicle. T. — Tripus. P.S.A.V. — Posterior spherical air vesicle. 

 A.S. — Anterior spherical with transverse membrane. PYR. — Pear-shaped air 

 vesicle. P.D.— Pneumatic duct. C.C— Cross canal. G.— Gullet. S. — Saccule. 

 R. — Round vesicle. U. — Utricle and ampullae. S.C.C. — Semi-circular canals. 

 E.— Epidermis. T.F. — Tympanic fenestra. G.L. — Ganglion with papilla. 

 v.— Vent. 



