456 Edward Phelps Allis jr., 



not contain true latero-sensory components of the main infraorbital 

 line, and the dermal postfrontal of the fish is certainly, if it be not 

 absent, represented in the so-called 2nd. postorbital bone. Cole's 

 "postfrontal or sphenotic" is then the postorbital ossification of my 

 nomenclature; that is an auto-postfrontal or true sphenotic. These 

 conclusions I have already had occasion to state in an earlier work [4, p. 368]. 



The squamosal lodges but a single sense organ, and that organ 

 is said to be innervated by the ramus oticus. There is thus in this 

 fish, as in Conger, no squamosal organ innervated by a postfacial 

 nerve, and the latero-sensory component of this bone is, as in Conger, 

 short by that amount. This lacking latero-sensory component of Gadus 

 may be represented in the so-called 3rd. supratemporal ossicle of Cole's 

 descriptions, this ossicle then here being found unfused with the 

 facial element of the squamosal. This I have already suggested in 

 two of my earlier works (Nos. 4 and 9). 



The supratemporal canal contains two sense organs, each lodged 

 in a small ossicle, and these two ossicles, together with Cole's fourth 

 supratemporal ossicle, which lodges a sense organ of the main infra- 

 orbital line, represent the extrascapular of the fish. Cole's third supra- 

 temporal ossicle quite certainly does not form part of this bone. 



The posttemporal, or suprascapular bone is said to lodge no sense 

 organ, agreeing in this with the corresponding bone in Esox. Whether 

 it is traversed by the lateral canal or not, I can not tell from the 

 descriptions. Cole says that the bone "comes to the surface of the 

 skull and supports the next 9 mm. of the lateral canal". 



No supraclavicular is described. 



Pleuronectidae. 



Pleuronedes. In Pleuronectes, Cole and Johnstone [27] say that 

 the bone designated by them as the last or most posterior supra- 

 temporal ossicle corresponds to the 2nd., 3rd. and 4th. supratemporals 

 of the cod fused together. This supratemporal ossicle would therefore 

 seem to lodge organ 15 infraorbital of their descriptions, that organ 

 of Pleuronectes evidently corresponding to organ 3 of the lateral line 

 of Cole's descriptions of Gadus. The position of the organ is not 



