1889.] NATURAL SCIENCES OF PHILADELPHIA. 265 



length, the posterior undivided portion broader than long ; the bony 

 bridge across the occiput but little shorter than the part of the head 

 which precedes it. In U. y-graecum the naked area is trapezoidal, 

 longer than broad, and about 4 times the length of the snout ; the Y 

 is forked for more than half its length, its undivided part more than 

 twice as long as broad, and not concave ; the occipital plate is not 

 half as long as the part of the head which precedes it." 



According to Dr. J. A. Henshall, the naked area on top of the. 

 head is the seat of electric power in life. This interesting statement 

 needs verification. 



Recapitulation. 

 The following is the list of the genera and species of the family of 

 star-gazers ( Uranoscopidae) recognized in this paper as occurring in 

 European and American waters : 



1. Kathetostoma Giinther. 



1. Kathetostoma averruncus Jordan and Bollman. 



2. Uranoscopus Linnaeus. 



2. Uranoscopus scaber Linnanis. 



3. Astroscopus Brevoort. 



o. Astroscopus anoplus. (Cuv. and Val.) 



4. Upsilonphorus Gill. 



4. Upsilonphorus Y-graecum. (Cuv. and Val.) 



5. Upsilonphorus guttatus. (Abbott.) 



