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ILUNOIS BIOLOGICAL MONOGRAPHS 



il20 



EXPLANATION OF PLATE 

 Fig. 33. — Transverse section through the roof of the anterior end of the otic capsule. 60 mm. 



Amiurus 

 Fig. 34. — Transverse section through the s>Tiotic tectum, 32 mm. larva. 

 Fig. 35. — Diagram of nerve, neural arch and myotome relations of a larval Amiurus. 

 Fig. 36. — ^Transverse section through the anterior end of the anterior semicircular canal, 



32 mm. Amiurus. 

 Fig. 37. — ^Transverse section through the posterior end of the basal plate, 32 mm. larva. 

 Fig. 38. — Transverse sections through the posterior end of the otic capsule, 32 mm. Amiurus. 

 Fig. 39. — ^Transverse section through the posterior part of the ethmoid region, 32 mm. 



Amiurus. 



