566 ADDENDA ET CORRIGENDA. 



scum at Fort Pitt. In consequence of the discovery of a second 

 species of Ctenopoma, a part of the diagnosis of that genus must be 

 modified, as follows : some of the opercular pieces serrated ; dorsal 

 spines sixteen to seventeen ; anal spines eight to ten. 



Page 378. Helostoma temminckii. 

 h-c. Adult. Java. Purchased of Mr. Jamrach. 



Page 380. Polyacanthus signatus. 

 m. Half-grown. Java. Purchased of Mr. Jamrach. 



Page 382. Gsphromenus olfax. 



Goramy, Hardw. in Zool. Jouni, iv. p. 309. 

 Important paper on the habits and the viviparous nature of this 

 fish. 



Page 483. Channa orientalis. 

 i. Young. Ceylon. Purchased of Mr. Cuming. 



Page 499. Gobiesox cephalus. 

 a. Half-grown. West Indies. Presented by the Officers of the 

 Army Medical Department at Fort Pitt. 



Page 528. AmpMsile strigata. 

 h. Adult. Purchased of Mr. Frank. 



Page 545. Notacanthus sexspinis. 

 a. Adult. Tyi^e of the species. 



Page 90. Omitted by inadvertence. 



Srt. TEIDENTIGER. 



Tridentiger, Gill, Ann. Lye. Nat. Hist. New York, 1858, December. 



Body subcylindrical, covered with ctenoid scales of moderate size ; 

 head depressed, flat, with the snout obtuse ; cleft of the mouth sub- 

 horizontal, with the jaws nearly equal anteriorly. Eyes of moderate 

 size. Teeth in both jaws in a double series, those of the outer series 

 tricuspid. Two dorsal fins, the anterior with six flexible spines ; 

 caudal quite free ; vcntrals united, short, adherent to the beUy. 



Fresh waters of Japan. 



1. Tridentiger obscurus. 



Sicydium obscurum, Sehler/. Faun. Japan. Poiss. p. 145. pi. 76. fig. 1. 

 Tridentiger obscurus. Gill, I. c. 



D. 6 I 11. A. 10-11. 

 Anterior dorsal spines produced. Brown. 

 Japan. 



