470 MEMOIRS OF THE CARNEGIE MUSEUM 



Moderately compressed; dorsal profile nearly straight to slif^htly convex; 

 membranous margin of the preoperclc (iinbriate. Mouth oblitiue; snout rather 

 pointed, 4.5 in I lie head; maxillary of moderate width, reaching a little beyond the 

 eye, 2.3 in the head. Tiie two very large canines of llic upper jaw, the two smaller 

 ones on cither side of tiic lower jaw in front, and the five or six small teeth near 

 the front of tlu; upper jaw, all lance-shai)ed, i. e., widened towards the tip and then 

 abruptly pointed. The other teeth, a row down the edge of the maxillary, and 

 an imier row of the lower jaw, all flat and very sharp. Clill-rakers 3 + 8, rather 

 slender, the longest not less than 1.5 in the eye, each with a row of a dozen or more 

 stout-conical spines down the posterior mesial aspect. Scales all small and cycloid; 

 the soft dorsal and anal very densely and completely covered with scales; pectorals 

 and vcntrals somewhat scaled. 



Lateral line becoming straight a considerable distance in front of the vent. 

 Spinous dorsal very weak, the longest spine 2.8 in I iic head. Anal spines very small; 

 anal high, 2.3 in the head. Pectorals much larger than the ventrals, reaching a 

 third of their own length beyond the latter, 1.3 in the head. 



Color light, much darker above; lower part of the head and a region along the 

 lateral line silvery. Spinous dorsal, tii)s of soft dorsal and caudal ra^'S dusky. 

 A dusky spot on the under side of the pectoral, on the axil, and on the lining of 

 the preopercle. 



The two small specimens (probably the young of Macrodon ancylodon) differ 

 from the larger onc^s in sevcnal respects. The head is relatively much deeper, the 

 lower jaw being more prominent, its lower end forming a sharp angle with the 

 ventral profile. The four or five large lanceolate canines' of the lower jaw are 

 larger than the two caninc^s of the upper jaw, and i)roje('t up over the up{)er jaw 

 onto th(> snout. Eye 4.5 in the heail. 



Subfamily Sci^NiNyE. 



Nkbris Cuvier and Valenciennes. 



Nebris Cuvnou and Valenciennes, Hist. Nat. Poiss., V, 1830, 149 (ynicrops). 



Type, Nebris niicrops Cuvier and Valenciennes. 



Skull excessively cavernous and soft; interorbitals \'ei-y l)i'()a(l; lower jaw pro- 

 jecting; teeth all villiform, in broad bands; eye very small; margin of the pre- 

 opercle very broad, membranous and fringed. Slits and pores on the upper jaw 

 not conspicuous. Pseudobranchiie developed. Soft dorsal, caudal, and anal well 

 scaled. Dorsal and anal spines weak. (\\Mtel)ra' H) + 14.) 



ner(> r(>present(>d by N^cl)ris Niicmps. 



