464 » Edward Phelps All is jr., 



three; and on tlie eyeless side of the fish but one oi'gan is here des- 

 cribed. On this eyeless side there is, moreover, no organ corresponding 

 to organ No. 2 of the ocular side, and the canal itself is said to end 

 blindly "a short distance anterior to the commissure", the so-called 

 commissure corresponding to my tube No. 3. The nasal sense organ 

 of this eyeless side of Pleuronectes is said by Cole and Johnstone to 

 have been innervated, in the one specimen they examined, by a branch 

 of the inner buccal nerve of the right side, which, is a very curious 

 variation or anomaly. 



Acanthopterygii. 

 Of these fishes I have sketches of the canals in the following 

 species, all made in past years, and none of them, excepting those 

 of Perca, subjected to proper control: 

 Perca fluviatilis, 



Micropterus dolomieu, J. and E. (Centrarchus dolomieu, Griinther), 

 Pomatomus saltatrix, J. and E. 



Archosargus probatocephalus, J. and E. (Sargus oris, Günther), 

 Cottus octodecimospinosus, Günther. 

 Cottus aeneus, Günther. 



To these can be added five other species, published descriptions 

 of which already exist; namely: 



Cottus gobio, described by Bodenstein [lù\ 



Lophius piscatorius „ Guitel [4I\, 



Batrachus tau „ Clapp [21\ 



Menidia „ Herrick [46\ 



Scomber scomber „ myself [lï\. 



In Scomber, the supraorbital canal anastomoses with the main 

 infraorbital by its penultimate primary tube, as in Amia; while in 

 Menidia it anastomoses by its terminal tube, as in Lepidosteus. In 

 both fishes the anastomosis takes place between the squamosal and 

 the dorsal bone of the postorbital series, and this latter bone, in both 

 fishes, is certainly the homologue of the dermal postfrontal of Amia. 

 Herrick says of this bone, in Menidia, that it is "rather massive, much 

 more so than any of the other bones of the orbital ring", and his 



