PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 289 



a pair of distinct spinous ridges in front of the occipital ridge; present 

 in one species only — auriculatus. NucJial: close behind the occipital; 

 in one species [serriceps) large and distinct, in the others either wanting 

 or often coalescent with the preceding. 



Two suprascapular spines are present in all the species excei)t auricu- 

 latKs, ^vliich has three on each side. 



The following table gives the names of the spinigerous ridges on the 

 top of the head usuallii present in each species, beginning with those in 

 which the ridges are least elevated : 



Pairs. 



Paueispinis, preocitlar, occipital 2 



Flavidtis, nasal 1 



MeJavops, nasal and preocular lor2 



Simulans, nasal . 1 



Ooalis, nasal, preocnlar, supruocnlar, postocnlar, tympanic, and occipital 6 



Pinnujer, nasal, preocnlar, supraocular, postocular, tympanic, occipital 6 



gAtrovirens, nasal, preocular, supraocular, occipital, and sometimes tympanic... 4 or 5 



Elonyatus, nasal, i)reocular, supraocular, tympanic, occijiital 5 



Easirell'ujer, nasal, x>reocular, supraocular, tympanic, occipital. - 5 



Auriculatus, nasal, preocular, supraocular, tympanic, coronal, occipital, and 



often nuchal 7 



Vcxillaris, nasal, preocular, supraocular, occipital, and sometimes tympEyiic ... 4 or 5 



Chlorostictus, nasal, preocular, supraocular, postocular, tympanic, occipital 6 



Buhrivinctus, nasal, preocular, supraocular, tympanic, occipital 5 



Eosacens, nasal, preocular, sui^raocular, postocular, tymxianic, occipital 6 



Constellatus, nasal, preocular, supraocular, postocular, tympanic, occij)ital 6 



JSfebulosus, nasal, preocular, supraocular, tympanic, occipital 5 



Buber, nasal, preocular, supraocular, postocular, tympanic, occipital 



Fasclolaris, nasal, preocular, supraocular, tympanic, occipital 5 



Serriceps, nasal, preocular, supraocular, tympanic, occipital, nuchal 6 



Nigrocinctus, nasal, preocular, supraocular, postociilar, occipital 5 



The character of the gill-rakers has been hitherto unnoticed. In this 

 regard the species may be grouped as follows : 



1. Long and slender : Jiavidus, simulans^ ovalis.jnnniger, onelanojjs, atro- 

 virens. 



2. Long and rather strong : rexiUaris, elongatns, cJiIorostictris, rosaceus. 



3. Stout and rather short, usually not clavate, but constricted toward 

 the tips : ruhrivinctus, auriculatus, constellatus, ruher. 



4. Stout, short, compressed, and clavate : nehulosus, fasciolaris, serri- 

 ceps, nigrocinctus. 



5. Very short, broader than high : rastrelliger. 



Sebastichthys atro virens sp. noY. 



Allied to 8. pimiiger. Body oblong, not very stout, not tapering 

 rapidly backward. Head moderate, rather pointed, its upper outline 

 with a slightly curved slope from the snout to the nuchal region. 



Moutli moderate, not very oblique, the lower jaw little projecting, the 

 rather sleuder maxillary extending to the posterior border of the pupil ; 

 the premaxillary below the horizon of the pupil. Maxillary largely 

 scaly. Eye large, about three and a half times in length of head. 

 Proc. Nat. Mus. 80 19 Sept. S8, 1880. 



