2760 Bulletin ^7, United States National Museum. 



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

 168. SOIADEICHTHYS FLAVESCENS (Cuvier & Valenciennes), text, p. 123. 



169. SCIADICHTHYS ME!SOPS (Cuvier & Valenciennes). 



170. SCIADEICHTHYS PKOOPS (Cuvier & Valenciennes). 



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

 head, If to 2J in the interorbital, 2^ to 3f in the inteiocular. Slender 

 and elongate, broader than deep. Head depressed, its width li in its 

 length, its depth 2, width at mouth 2; anterior portion of tlie head fiat 

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

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

 cess mucronate, broader than long; dorsal jjlate large, butterlly-shaiied. 

 Opercle striate ; fontanel 11 times as long as the eye, its center in front 

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

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

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

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

 5 + 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 1.} in bead; 

 space between dorsal and adipose iins 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 4^ in the length; anal cmargiuate, as 

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

 ened or granular in front, serrated behind, 1;V to 1^ 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 m. long. Pernambuco. (Hartt& Fletcher.) Northern coast 

 of South America to Pernambuco. (Eigenmann & Eigenmann, Nematog- 

 nathi, 57.) 



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

 172. SCIADEICHTHYS ALBICANS (Cuvier A: Valenciennes), text, p. 124. 



71. SELENASPIS, Blceker. 



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. SELEXASPIS HERZBEKGII (Bleeker). 



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

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

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

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

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



