114 PROCEEDINGS OF THE ACADEMY OF 



jaw not notched beneath. Intralabial filament obsolete. Body naked. Two 

 dorsal fins ; the first with four short spines, the second equal to the anal. 



Astroscopus resembles Upselonphorus in the absence of an intralabial fila- 

 ment, the condition of the preoperculum. and the naked cheeks, but is dis- 

 tinguished from that genus by the complete armature of the superior surface 

 of the head and the almost naked body. 



Astroscopus anoplus Brevoort. 



Uranoscopus anoplus Cuv. et Vol., Hist. Nat. des Poissons, torn. viii. p. 



493. Dekay, Natural History of New York Fishes, p. 37, pi. xxii. fig. 65. 



Storer, Synopsis of the Fishes of North America, p. 46 ; ib. in Memoirs of 



the American Academy, vol. ii. p. 298. 

 Astroscopus anoplus Gill, Proceedings of the Academy of Natural Sciences 



of Philadelphia, 1860, p. 20. 

 Agnus anoplus Giinther, Catalogue of the Acanthopterygian Fishes, &c, 



vol. ii. p. 229. 

 Astroscopus anoplus Gill, Catalogue of the Fishes of the Eastern coast of 



North America, p. 43. 



V. Cathetostoma Giinther. 



Kathetostoma Giinther, Catalogue of Acanthopteryeian Fishes, &c, vol. ii. p. 



231. 

 Uranoscopus sp. Cuv. et Vol. 



Head nearly square above, and covered with bony plates. Cheeks naked. 

 Preoperculum armed at its inferior margin with several spines. Lower jaw 

 not notched beneath. Intralabial filameut obsolete. Body without scales. 

 Dorsal fin single, and commencing over the second half of the pectorals fins, 

 with no strong spines. 



This genus is readily distinguished by the naked body and single short and 

 unarmed dorsal fin. The lateral line also ascends less rapidly on the dorsal 

 region, and runs farther from the base of the dorsal fin than in the other 

 members of the subfamily of Uranoscopinse, except Gnathagnus. 



Only one species is known. 

 Cathetostoma l.e:ve Giinther. 



Uranoscopus lsevis Block, Systema Ichthyologiae Schneid. ed., p. 47, tab. viii. 



Ichthyoscopus laevis Swainson, Natural History of Fishes, Amphibians and 

 Reptiles, vol. ii. p. 269. 



Kathetostoma laeve Giinther, Catalogue of the Acanthopterygian Fishes, &c, 

 vol. ii. p, 231. 



Habitat. Australian, seas. 



VI. Ichthyoscopus Swainson. 



Ichthyoscopus sp. Swainson, Natural History of Fishes, Amphibians and Rep- 

 tiles, p. 269, 1839. 



Anema sp. Giinther, Catalogue of the Acanthopterygian Fishes, &c, vol. ii. 

 p. 230, 185960. 



Uranoscopus sp. Cuv. et Val. 



Head above completely mailed. Cheeks naked. Preoperculum unarmed. 



Lower jaw entire beneath. Intralabial filament obsolete. Body covered with 



minute scales. Dorsal fin single and opposite the anal, but armed in front 



with three or four gradually increasing spines. 



Ichthyoscopus, as now restricted, contains only species with a scaly body, 



provided with a single dorsal fin, whose first rays are spinous. There are 



neither intralabial filaments nor mental barbels. 



Ichthyoscopus Le Beckii Gill. 



Uranoscopus Le Beck Bloch, Systema Ichthyologise, Schneid. ed., p. 47. 

 Uranoscopus inermis Cuv. et Val,, Hist. Nat. des Poissons, torn. iii. p. 310, 

 pi. 65. 



[May, 



