THE NECTURUS 17 



and ceratohyals. The first visceral arch consists of cerato- 

 branchials and epibranchial. The ceratobranchials of the 

 second arch are small and missing in the remaining ele- 

 ments. 



The gills are supported by the first, second and third 

 epibranchials. There are traces of the fourth and possibly 

 the fifth epibranchials. 



Drawing 7. Make a drawing of the visceral skeleton from the 

 ventral view. 



