NO. 1872. NEW FAMILY OF SHARKS— SMITH. 491 



and continued on lower jaw for about .5 distance to symphysis; 

 nostrils very large, oblique, inferior, each .5 width of snout at their 

 anterior margin; interorbital space flattish, twice diameter of eye; 

 teeth in both jaws similar, erect, grooved, with a median lanceolate 

 cusp and two smaller cusps on each side; body and fins completely 

 covered with minute, closely imbricated, leaf-shaped denticles, with 

 a strong median keel and one lateral keel on each side, the scales on 

 the upper edge of peduncle enlarged; numerous pores on head, includ- 

 ing a sharply defined elongate oval patch of large pores on upper and 

 lower surfaces of snout, the pores arranged m regular lines, a patch 

 of similar pores on cheek immediately in front of eye and another on 

 corresponding portion of underside of snout posterior to nostril; 

 branchial apertures small, the length of the series .33 anterior margin 

 of pectoral ; spiracle round, minute, close to posterior angle of orbital 

 opening. 



Dorsal fin over posterior end of anal, its origin midway between 

 fu'st gill-opening and end of tail, height of fin ecpial to snout, length 

 of base .66 height; caudal fiii very long, the upper lobe narrow and 

 extending toward the dorsal as a low ridge, the lower lobe long, 

 notched posteriorly, deep anteriorly, and contiguous with anal; origin 

 of anal nearly midway from end of snout to tip of tail, its base as long 

 as head (to first gill-opening), its greatest length about equal to that 

 of lower caudal lobe; ventral fins small, their origin midway from eye 

 to dorsal fin, the modified rays (claspers) round, thick, expanded at 

 end, and reaching to anal; pectorals large, broad, with rounded 

 corners and straight posterior margin, extending to ventrals when 

 closely applied to body. 



Color: Uniform dark brown. 



Type. — Cat. No. 70260, U.S.N.M., a male specimen 50.8 cm. long, 

 taken with a beam trawl on July 31, 1909, at station 5486 (lat. 10° 

 02' N.; long. 125° 19' 20" E.), in the Sea of Mindanao, between the 

 islands of Mindanao and Leyte, at a depth of 585 fathoms. 



