236 



PROCEEDINGS OF THE ACADEMY OF 



[Apr., 



Gill-openings small, inferiorly lateral, extend forward about 

 opposite hind edge of eye. Isthmus moderately broad, width If 

 in snout. 



Body almost everywhere minutely spinose. Scales without dis- 

 tinct keels. Eight plates between dorsal and adipose fin. Snout all 

 more or less roughened, especially along sides. Lower surface of 

 head and abdomen entirely naked, only interrupted by striate 

 osseous exposures of coracoids. Fin spines all spinulose. L. 1. 

 scarcely distinct. 



Dorsal origin placed little nearer origin of adipose fin than snout 

 tip, spine (damaged) slightly enlarged and evidently longest of fin 



Fig. 9. — Hypoptopoma psilogaster^Fovfler. (Type.) 



radii. Adipose fin reduced to a simple depressed little plate, inserted 

 slightly nearer dorsal origin than caudal base. Anal inserted behind 

 base of depressed dorsal. Caudal (damaged) with lower lobe appar- 

 ently longer ?. Pectoral with long, slender and slightly curved spine, 

 its outer edge with minute asperities and spinules, and inner edge 

 antrorsely serrate, also extends about f in depressed ventral. Latter 

 not reaching anal. Vent about midway in postventral region. 



Color in alcohol largely dull brownish (with greenish tint doubtless 

 due to having been preserved originally in a copper vessel). Snout 

 and side of head with dusky dots. A narrow streak of dark brown 

 also along side of snout, and continued behind eye to shoulder. 

 Median caudal rays dusky. Iris brownish. 



