NEBRODES CONCOLOR. 57 



which are different in shape and much less numerous; there is a smaller number 

 of series in function at the same time, apparently not more than one. 



Snout hardly as broad as that of Ginglymostoma. Eyes very small. Spir- 

 acles minute, about one length of the orbit behind the eye. Nostrils connected 

 with the mouth by nasoral grooves; anterior valves with cylindrical cirri, reach- 

 ing the mouth, widely separated by their preoral attachment, posterior valve 

 a fold on the outer side of the groove at the angle of the mouth. Mouth rather 

 small; lips swollen, lower shorter. Teeth small, polycuspid, compressed, one 

 or two series in function. Fourth and fifth gill openings close together, above 

 the pectoral. 



Indian Ocean. 



First dorsal above the ventral, second above the anal 



first dorsal distant from second less than length of base . concolor (page 57) 

 first dorsal distant more than the length of its base from that of second. 



macrurus (page 58) 



Nebrodes concolor. 



Nebrius concolor Ruppell, 1837, Beschr. Chondropt., p. 2, pi. 17, f. 2; 1838, Neue wirb., fische, p. 



62, pi. 17, f. 2. 

 Ginglymostoma concolor T. Cantor, 1849, Malay, fishes, p. 395; Gunth,, 1870, Cat. fishes Brit, mus., 8, 



p. 409. 

 Ginglymostoma ruppellii Bleeker, 1852, Plagios., p. 91; 1852, Nat. tijds. Ned. Ind., 3, p. 83; Dumeril, 



1865, Elasm., p. 334. 



Snout bluntly rounded. First dorsal much larger than second, bases of 

 the two separated by the length of the base of the second, origin of the first 

 directly above the bases of the ventrals. Caudal 3 of the total, with the merest 

 suggestion of a lower lobe. Teeth small, in several transverse series of which 

 only one is in function; each tooth with a convex cutting edge formed of small 

 cusps the median of which is stronger. Angles of pectorals, ventrals, dorsals, 

 and anal sharp. Cirrus shorter than the narial valve. 



Color brownish or rusty brown. 



Distinguished from N. macrurus by the size of the first dorsal, its distance 

 from the second, its origin above that of the ventral, and by the sharp angles 

 of the fins. 



Red Sea to India. 



