^°im"'] PROCEEDINGS OF THE NATIONAL MUSEUM. 85 



bbb. None of the dorsal spines filamentons. Postaxillary plates wanting. Dorsal 

 series of plates more complete, extended posteriorly on back of caudal 

 peduncle, 

 c. Nasal tentacle broad and palmate, with narrow stem-like base. Nasal, two 

 postocular, and occipital spines present. luterocular space abont half 

 pupil. Supraocular filament usually fimbriate. Head 2^ in length. 



FlMBRlATUS. 



cc. Nasal tentacle simple, slender. Eye very large; iuterocular space very nar- 

 row, about one-fourth pupil. Maxillary reaching posterior border of 

 pupil. No postocular or occipital spines. Head 2^ in length.. .Oculatus. 



cec. No nasal tentacle. Head small, one-third length. Iuterocular sjiace 2^ in 

 pupil. Dorsal series of plates usually interrupted under posterior rays of 

 soft dorsal, then continued on back of caudal peduncle. No postocular 

 spine; nasal and occipital spines present Quadriseriatus. 



44. Icelinus filamentosus sp. nov. 



Body shaped as iu I. quadriseriatus but heavier, the depth 4J iii 

 length ; caudal peduncle two-thirds diameter of orbit. Mouth small, 

 maxillary not reaching vertical from middle of pupil, 2^ in head. Teeth 

 in broad bauds on jaws, vomer, and palatines. Eye moderate, 3^ in 

 head. luterorbital space not narrow, grooved, its width more than half 

 diameter of orbit. Preopercular spine strong, three-fourths diameter 

 of orbit, with a short terminal point and three or four strong upwardly 

 directed barbs, curved slightly forwards. Below this three short simple 

 si)ines directed downwards, and downwards and forwards. 



Nasal spines strong; occiput with a broadly rounded ridge, ending 

 behind in a rather blunt point. No pit behind eyes. No other spines 

 on head. Gill membranes broadly joined, free from isthmus. 



A simple slender filament at base of nasal spine, a conspicuous one 

 on tip of maxillary, two on occipital ridge, three on preopercular 

 margin, an inconspicuous one near base of opercular flap. A large 

 black supraocular flap, about as long as diameter of pupil. 



Body armed essentially as in quadriseriatus ; the upper series of 

 plates double throughout, beginning under third or fourth dorsal 

 spine, and terminating under last dorsal ray, twenty-eight or thirty in 

 each series. Thirty-six to thirty-seven plates in lateral line, their j)os- 

 terior borders occasionally with a slender white filament. Axil of 

 pectoral with from two to six half-imbedded spinous plates. Skin 

 otherwise smooth. 



Fins large, the spinous dorsal with the first two rays produced into 

 long slender filaments, which reach beyond middle of soft dorsal, and 

 are much longer than head. The membrane between these is not in- 

 cised, and they are not separated from rest of fin. Dorsals not con- 

 nected, the longest ray of soft dorsal nearly half head. Pectorals not 

 long, 1^ to \h in head. Ventrals about one fifth head. 



Head 2f in length ; depth 4.^ to U. D, X-16 or 17 ; A. 14 or 15. L. 

 9 inches. 



Color : Olivaceous above, white below; a distinct black blotch under 

 spinous dorsal, one or two diffuse blotches under soft dorsal, and sev- 



