1940 Bulletin 4.7, United States National Museum. 



a. Transverse occipital ridge not developed ; interorbital groove deep and narrow ; pre- 



operciilar spines small. LUCASI, 2312. 



aa. Transverse occipital ridge well developed ; interorbital groove less deep and wider ; 



preopercular spines larger. DICERAUS, 2313. 



2312. CERATOCOTTUS LUCASI, Jordan & Gilbert, new species. 

 Head 24 in length, measured to end of opercular flap; depth 3J. D. 

 VII, 13; A. 12; P. 17 or 18. Eye 4f in head; maxillary 2|; preopercular 

 spine 2|; pectoral fin \\. Maxillary reaching nearly to the vertical from 

 posterior margin of eye; villiform teeth on jaws and vomer, the outer 

 series in jaws enlarged; no teeth on palatines; interorbital space very 

 deeply channeled, its least width f diameter of eye; upper edge of orbital 

 rim sharp aud beset with a single series of small teeth ; occiput abruptly 

 depressed behind the eyes to below the floor of interorbital space, as in C. 

 diceraus, nearly flat both transversely and longitudinally, the occiput ridges 

 being very low, and the transverse ridge so conspicuous at back of occiput 

 in adult C. diceraus is here not developed; nuchal ridges high, elevated, 

 and compressed into a minutely serrated edge, a very small cusp-like ele- 

 vation at their base anteriorly; nasal and preorbital spines as in C. 

 diceraus; upper preopercular spines slender and somewhat decurved to- 

 ward tips, minutely roughened on the outer surface, and bearing on their 

 upper edge 3 retrorsely hooked spines, resembling the spines on a rose 

 bush; below this 3 short, strong spines, the first immediately below the 

 upper spine and diverging from it, the second directed nearly vertically 

 downward, the third downward and forward; 2 strong diverging spines 

 at anterior angle of subopercle; opercular ridge elevated; all exposed 

 bones of head roughened with radiating series of lines which are beset 

 with minute prickles; lateral line with 36 bony plates decreasing in size 

 posteriorly, each plate bearing small slender spines, those on the middle 

 of plate longer than the others and directed backward. From fragments 

 of skin left on snout and side of head in 1 specimen, it is evident that 

 this species is colored much as in C. diceraus, the ground color light olive, 

 thickly covered with small dusky spots, around which the ground color 

 forms narrow reticulating lines. When taken the bones of the head were 

 a bright vitriol green. Bering Sea; 2 specimens, 135 and 132 mm. long; 

 1 taken from the stomach of a cod, the other from a halibut, both of 

 which were captured near St. Paul Island. The skin is digested off from 

 both specimens, so that the color can not be determined, but they are 

 otherwise in good condition. Differing from C. diceraus in the deeper nar- 

 rower interorbital groove and the smaller size and different armature of 

 the preopercular spines. (Named for Mr. Frederick Augustus Lucas, 

 Curator of Comparative Anatomy in the U. S. National Museum and mem- 

 ber of the U. S. Fur Seal Commission in 1896 and 1897. 



Ceratocottus lucasi, JORDAN & GILBERT MS., Fishes Bering Sea, 1896, 1897 MS., St. Paul 

 Island (Type, No. 48234; Cotype, No. 5661, L. S. Jr. Univ. Mus. Coll. Jordan.) 



2313. CERATOCOTTUS DICERAUS (Pallas). 



D. VII, 14 ; A. 10 ; C. 12 ; P. 17 ; V. I, 3. Form of Enoplmjs Uson, the head 

 large, wider than deep or long; top of head nearly as in Enoplirys Uson, 

 the ridges higher and very rough; orbital ridges elevated, continued 



