FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 201 



to 1% ill interorbital ; mouth width 2% to 2V5 in head, gape ly^ to 

 114 its width, form nearly equilateral triangle, without folds or 

 grooves at corners; upper jaw with about 60 rows of fine, tricuspid 

 teeth, edges of all entire and median cusp largest, narrowly triangu- 

 lar; nostril % to % long as eye, internarial less than nostril length, 

 1% to 2% in preoral length, which 2% to 3% in head; interorbital 

 2l^ to 2%, broadly and slightly convex. Last gill opening smallest, 

 nearer fourth than width of other interspaces. Spiracle rather large, 

 close behind lower eye edge. 



Scales minute, tridentate, median point longest and wdth median 

 keel. Caudal without pits. 



First dorsal origin little nearer second dorsal origin than snout 

 tip, fin length 1 to 1% in head; second dorsal length ly^o to l^^; 

 anal length 1% to I14, origin opposite to slightly in advance of 

 second dorsal origin; caudal 2i/^ to 2^ in rest of body, subcaudal 

 length 1% to 11/4 in caudal length; least depth of caudal peduncle 

 4 to 414, in head; pectoral IVe to ll^, width 1% to ly^ in its length; 

 ventral length ly^ to 1% in head. 



Upper surface gray brown, under surfaces pale to whitish. 

 Caudal with 4 obscurely defined slightly darker broad bandlike 

 blotches, much wider than pale interspaces. Young with hind por- 

 tions of dorsals whitish. 



Philippines. 



D. 5135. Balukbaluk Island (North) S. 59° W., 6.25 miles (6° 44' 45" N., 121° 



48' E.), Sulu Archipelago, near Basilan Island. February 7, 1908. Length, 



110 to 228 mm. 2 examples. 

 3301 to .330-1, 3665. D. 5403. Capitancillo Island Light, S. 46° W., 15.7 miles 



(11° 10' N., 124° 17' 15" E.), between Leyte and Cebu. March 16, 1909. 



Length, 119-190 mm. 5 examples. 

 1716. D. 5.503. Macabalan Point Light (Mindanao), S. 31° E., 6.6 miles (8° 36' 



26" N., 124° 36' 08" E.). August 4, 1909. Length, 120 mm. 

 1954, 1962. D. 5518. Port Tagolo Light, S. 64° W., 8.7 miles (8° 48' N., 123° 81' 



E.), Mindanao. August 9, 1909. Length, 213-234 mm. 2 examples. 

 1530. D. 5537. Apo Island (C), S. 26° W., 11.8 miles (9° 15' 45" N., 123° 



22' 00" E.), between Negros and Siquijor. August 19, 1909. Length, 242 



mm. 



Genus MUSTELUS Linck 



Mustehis Linck, Mag. Phys. Naturg. Gotha, ser. 3, vol. 6, p. 31, 1790. (Type, 

 Squalus mustelus Linnaeus, monotypic.) 



Mustelus Valmont, Diet. Hist. Nat. Poiss., vol. 3, p. 138, 1768; vol. 12, p. 523, 

 1769. [Type, Galeus stellafus Valmont=Squaliis mustelus Linnaeus (in- 

 admissible).] — Risso, Hist. Nat. Europe merid., Poissons, vol. 3, p. 126, 

 1826. (Type, Squalus mustelus Linnaeus.) 



Mustellus Fischek-Waldheim, Zoognosia, ed. 3, vol. 1, p. 78, 1813. (Type, 

 Squalus mustelus Linnaeus.) 



Myrmillo Gistel, Naturg. Theirreichs, p. x, 1848. (Type, Squahis mustelus 

 Linnaeus, virtually.) {Myrmillo Gistel proposed to replace Mustelus 

 Linck. ) 



