2760 Bulletin 4.7 , United States National Museum. 



167. SCIADEICHTHYS TEMMltfCKIAMJS (Cuvier & Valenciennes), text, p. 122. 

 168. St'IADEICHTHYS FLAYESCEXS (Cuvier & Yalenciennes), text, p. 123. 



169. SCIADICHTHTS MESOPS (Cuvier & Valenciennes). 



170. SCIADEICHTHYS PROOFS (Cuvier & Valenciennes). 



Head 4 to 4; depth 7. D. I, 7; A. 18; eye 1 to H in snout, 5| to 8 in 

 head, If to 2j| in the interorbital, 2 to 3f in the interocular. Slender 

 and elongate, broader than deep. Head depressed, its width \\ i 11 i* 8 

 length, its depth 2, width at mouth 2 ; anterior portion of the head Hat 

 above; top of the head, humeral process, and dorsal plate coarsely gran- 

 ular, the granules arranged in series along the fontauel. Occipital pro- 

 cess mucronate, broader than long; dorsal plate large, butterHy-shaped. 

 Opercle striate; fontanel \\ times as long as the eye, its center in front 

 of the middle of the eye, continued as a shallow groove. Jaws subeqnal ; 

 teeth all villiform, the intermaxillary band very wide and shallow; teeth 

 on the roof of the mouth in 6 contiguous patches. Gill membranes meet- 

 ing in an angle, forming a broad fold across the isthmus; gill rakers 

 5 4- 10. Pectoral pores large ; vertical series of pores. Distance of dorsal 

 spine from the snout 2* in the length; the dorsal spine granular in front, 

 striate on the sides, weakly serrate behind, its length 1 to \\ in head; 

 space between dorsal and adipose fins 2 to 3 in length, the adipose fin 

 little shorter than the dorsal, the posterior margin free. Caudal deeply 

 forked, its upper lobe longer, 4 to 44- in the length; anal emarginate, as 

 high as long, 2 to 2 in head ; ventrals 2 in head ; pectoral spine rough- 

 ened or granular in front, serrated behind, \\ to H in head. Plumbeous 

 above, with blue luster, white below ; maxillary barbels dark, the mental 

 barbels white ; fins all more or less dotted with brown. Five specimens 

 0.25 to 0.46 in. long. Pernambuco. (Hartt& Fletcher.) Northern coast 

 of South America to Pernambuco. (Eigenmann & Eigemnann, ISTematog- 

 nathi, 57.) 



171. SC1ADEICHTYS PASSANY (Cuvier & Valenciennes), text, p. 124. 

 172. SCIADEICHTHYS ALB1CANS (Cuvier & Valenciennes), text, p. 124. 



71. SELENASPIS, Bleeker. 



Dorsal shield much enlarged, truncate before, in the adult; palatine 

 teeth villiform, the patch extended backward in the adult; posterior 

 nasal openings connected by membrane. 



173. SELENASPIS HERZBEBGII (Bleeker). 



Head 3f to 3f ; depth 5 to 6. D. I, 7; A. 18; eye If to 2 in snout, 

 5 to 8 in head, 2i to 4 in interocular. Elongate, the width as great or 

 greater than the depth. Width of the head 1 to \\ in its length, at the 

 angle of the mouth about 2; depth 1| to If in its length. Humeral pro- 

 cess, dorsal plate, top of head to between the eyes, granular. Occipital 



