ADDENDA - 105. CHIRIDJS HEXAGRAMMUS. 949 



on vomer or palatines; tongue very slender, sharp; opercles unarmed. 

 Gill-openings very wide, the membranes narrowly joined to the isthmus 

 on the median line. No lateral line. Branchiostegals 5. Dorsals sep- 

 arate; the first of 6 very slender, flexible spines; the second elongate, 

 similar to the anal; caudal long and pointed, free from dorsal and anal; 

 ventrals close together, separate, each of one spine and four rays, their 

 insertion below or behind pectorals; anal papilla present. (r?, dart; 

 fXwffffa, tongue.) A remarkable type, belonging to the Oxymetopontince, 

 differing widely from our other Gobioid fishes. 



996 (&). I. calliurus Bean. 



Light blive, without distinct markings (in spirits); tip of first dorsal 

 dusky; caudal apparently with a median reddish stripe and two bluish 

 bands. Head not crested, its upper surface gently rounded; maxillary 

 extending to opposite front of pupil, 2 in head; upper jaw with about 

 2 series of teeth, the outer enlarged; 2 curved canines behind the baud; 

 lower jaw with about 1 row of smaller teeth, besides about 4 canines. 

 Eye large, twice length of snout, 3| in head. Gill rakers long and 

 slender. Dorsal fins contiguous, the longest spine filamentous, about 

 as long as head; caudal lanceolate, half as long as rest of body; ven- 

 trals inserted very slightly in advance of pectorals, nearly as long as 

 head. Scales minute, mostly cycloid. Head 5; depth 7^. D. VI-22; 

 A. I, 21. L. 4 inches. Deep water off Pensacola, Fla. 



(Bean, Proc. U. S. Nat. Mus. 1882, 419; Jordan & Gilbert, Proc. U. S. Nat, Mus. 

 2, 297.) 



Page 642. Hexagrammm ordinatus is a typical Hexagrammus, having 

 the dorsal fin divided. The genus Pleurogrammus should probably be 

 adopted for H. monopterygius, which is, in Alaska, one of the most im- 

 portant food-fishes, according to Dr. Bean. 



Page 644. Dr. Bean considers our suggestion, that Hexagrammns 

 scaber is the young of H. aspcr, as improbable. The following are the 

 characters assigned to the former species: 



999 (&). H. scaber Bean. 



Light brown, silvery below; each dorsal with 3 dark blotches, smaller 

 than eye, not reaching base of fin; pectorals, ventrals, and anal immac- 

 ulate. Teeth on jaws and vomer; none on palatines. A tentacle above 

 eye. Six lateral lines on each side; the supplemental one faint, extend- 

 ing backward from above base of pectoral, disappearing near middle of 

 body. Scales everywhere very rough. Caudal forked ; dorsal deeply 



