56 THE PLAGIOSTOMIA. 



nasoral groove. Mouth wide, labial folds crossing half or more of the distance 

 from the angles to the symphysis on the lower jaw and little less on the upper. 

 Teeth small, on a 23 inch specimen in §§ rows, in several functional series, 

 commonly with a strong hooked median cusp at each side of which there is a 

 denticle. Fourth and fifth gill openings wider than the first, close together, 

 above the pectoral. Fins short, broad, convex on the margins, rounded on the 

 angles. Origin of first dorsal opposite the middle of the base of the ventral, 

 end one length in front of the base of the second dorsal. Origin or end of base 

 of second dorsal little forward of those of the anal. Anal little smaller than 

 second dorsal, position slightly backward. Subcaudal short and deep, not lobed 

 anteriorly. 



Scales small, with quadrangular exposure, with 3-9 keels or smooth, with 

 hinder edges notched by the keels or entire. 



Uniform brown, young with small spots of black. 



Zanzibar and Seychelles; Indian Ocean. 



GlNGLYMOSTOMA FERRUGINEUM. 



Scyllium ferrugineum Lesson, 1830, Voy. Coquille, Poiss., p. 95. 



Ginglymostoma concnlor Muller & Henle, 1841, Plagios., p. 22, pi. 6. 



Ginglymostoma midleri Gunth., 1870, Cat. fishes Brit, mus., 8, p. 408; Klunzinger, 1871, Syn. fische, 2, 



p. 230; Day, 1878, Ind. fishes, p. 725; Gunth., 1910, Stidsee fische, 3, p. 487. 

 Ginglymostoma ferrugineum Jord. & Snyder, 1906, Bull. U. S. fish, comm., 26, p. 182; Regan, 1908, 



Proc. Zool. soc. Lond., p. 51. 



Head depressed; snout short, moderately broad, more pointed than that 

 of G. brevicaudatum , bluntly rounded. Anterior nasal valves reaching the 

 mouth, cirrus much shorter, hardly half as long as the valve. Teeth small, 

 with a strong median cusp and several, 3-5, smaller lateral cusps, several rows 

 in function. Fins short, with rather sharp angles; dorsals moderately large, 

 origin of the first nearly opposite that of the ventral, base little more than dis- 

 tance from that of second, more than base of second. Anal little smaller than 

 second dorsal, bases equal, hinder angle produced. Caudal nearly 5 of total 

 length. 



Scales small, with obtuse central keel, crenulate on the hind margin. 



Uniform rusty brown. 



India and East Indies. 



Nebrodes. 



Nebrius Rti ppell, 1837, Beschr. Chondropt., p. 2; 1838, Neue wirb., fische, p. 62. 



Closely allied to Ginglymostoma but readily distinguished by the teeth, 



