666 ADDENDA ET CORRIGENDA. 



seum 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 t-en. 



Page 378. Helostoma temmincMi. 

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



Page 380. Polyacanthus signatus. 

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



Page 382. Osphromenus olfax. 

 Goramy, Hardw. in Zos^l. Journ, 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 Ofiicers of the 

 Army Medical Department at Fort Pitt. 



Page 528. Amphisile strigata. 

 h. Adult. Purchased of Mr. Frank. 



Page 545. Notacantliiia sexspinis. 

 a. Adult. Type of the species. 



Page 90. Omitted by inadvertence. 



8rt. TRIDENTIGER. 



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



Body subcylindrical, covered with ctenoid scales of moderate size ; 

 head depressed, flat, Avith 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 scries, those of the outer series 

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

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



Fresh waters of Japan. 



1. Tridentiger obscurus. 



Sicydium obscurum, Schleg. Faun. Japan. Poiss. p. 145. pi. 70. fig. 1. 

 Tridentiger obscurus, dlill, I. c. 



D. r; I 11. A. 10-11. 



Anterior dorsal spines produced. Brown. 

 Japan. 



