116 THE PLAGIOSTOMIA. 



in a somewhat pointed arch; labial fold on upper jaw about two sevenths of its 

 length, that on lower jaw little shorter, partly hidden at the angle. Teeth in || 

 rows, deeply notched on the hind margin, broad based, cusps inclined outward, 

 concave on the inner margin. Median tooth of the upper series and the two 

 symphyseal teeth of the lower smaller and more erect than the others. Gill 

 openings rather narrow, hindmost two above the pectoral. Outer angle of the 

 pectoral reaching below the middle of the base of the dorsal, hind margin con- 

 cave, inner angle extending little behind a vertical from the dorsal origin. Hind 

 angle of first dorsal about reaching a vertical from the origin of the ventrals; 

 base two and one half times its length in advance of the second dorsal. Second 

 dorsal very small, its acuminate end extended little more than half way from 

 its base to the caudal pit. Base of anal nearly twice the length of that of the 

 second dorsal, ending below the middle of the latter, hind margin deeply ex- 

 cavated. Ventrals about equal the anal, inner angles much less produced. 

 Length of caudal less than one third of the total, subcaudal lobe prominent, 

 caudal pits distinct. Scales minute, the five keels produced as short spines. 



Total length 20|, snout to pores 9f, snout to fifth gill opening 4j, snout to 

 mouth if, and length of caudal 5§ inches. 



Back brown, shading to white below from the flanks and the sides of the 

 -head; hind margins of pectorals white. 



Philippines; East Indies. 



SCOLIODON VAGATUS, Sp. llnv. 



Head long; crown straight longitudinally, convex transversely; snout long, 

 broad, convex on the sides, blunt pointed at the end. Distance between the 

 outer angles of the nostrils greater than their distance from the end of the snout. 

 Eye large, distance from end of snout equal that from the first gill opening, 

 length of orbit little more than one fourth of the length of the snout. Mouth 

 large, length less than two thirds of the width; labial folds on both jaws, upper 

 reaching half way to below the middle of the eye, equal the width of the 

 orbit, lower little shorter. Teeth in 13+13 rows; bases very broad; cusps 

 rather narrow and short; inner or cutting edge much inclined toward the angles 

 of the mouth and concave; apex more erect; outer edge deeply notched; both 

 edges with fine serrations near the base. On the upper teeth the cusps are 

 little broader and the inner edges are less concave. Greatest width of the 

 pectorals about two thirds of the length, outer angle sharp, extending behind the 

 middle of the base of the dorsal, hind margin concave. Origin of the first dorsal 



