Bulletin 47, United States National Museum. 1575 



tt. Posterior canines wanting or reduced to a 



slight rudiment. 



u. Anterior canines ; dorsal spines slender 

 but pungent. EMMEEKIA, 636. 



uu. Anterior canines f . 



v. Dorsal spines slender and A-ery 

 flexible ; body very slender. 



OXYJULIS, 637. 

 vv. Dorsal spines pungent. 



JULIDIO, 638. 



uuu. Anterior canines f ; dorsal spines pun- 

 gent. PSEUDOJULIS, 639. 



rr. Dorsal spines 8 ; no posterior canines ; anterior canines 



, normal in position ; a low sheath of scales at base 



of dorsal; dorsal spines pungent; anal spines 3, 



never 2. CHLORICHTHYS, 640. 



XYHICHTHYIN^E : 



nn. Lateral line interrupted posteriorly, beginning again on the level of the 

 axis of the body, on the caudal peduncle ; scales large, 20 to 30 in the 

 lateral line; dorsal spines 9; anal spines 3; anterior canines . 

 w. Posterior canine present; snout slender, the anterior profile not 

 convex ; cheeks and opercles scaly ; dorsal spines pungent, the 

 three anterior longer and with filamentous appendages ; dorsal 

 and anal with a scaly sheath ; scales very large. 



DOEATONOTUS, 641. 



ww. Posterior canine none ; anterior profile more or less convex; head 

 naked, except usually a few scales below the eye; body more 

 or less strongly compressed ; ventrals thoracic, inserted below 

 the pectorals. 



x. Scales very large, about 20 in the lateral line, which is placed 



on the first row of large scales below the dorsal sheath ; 



anterior dorsal spines not detached ; head not trenchant 



above. XYEULA, 642. 



xx. Scales large, about 26 in the lateral line, which is placed on 



the second row of large scales below the dorsal sheath. 



y. First two dorsal spines joined by membrane to the 



others, and inserted nearly above base of pectorals. 



z. Upper anterior profile of head not trenchant, the 



curve of head not parabolic; the cheeks not 



very deep. NOVACULICHTHYS, 643. 



zz. Upper anterior profile of head sharply trenchant^ 



its curve parabolic; cheeks very deep, the eye 



near upper profile. XYRICHTHYS, 644. 



yy. First two dorsal spines detached from the others and 



inserted on or close behind the occiput. 



INIISTIUS, 645. 



627. CENTROLABRUS, Giinther. 

 (ROCK COOKS.) 



Centrolabrus, GUNTHEB, Cat. Fish. Brit. Mus., iv, 92, 1862 (exoletus). 



Body oblong, covered with moderate-sized scales ; cheeks and opercles 

 scaly; preopercle serrate; teeth in a single series; mouth small; dorsal 

 fin nearly scaleless ; anal spines 4 to 6 ; dorsal spines 16 to 21. This genus 

 contains 2 or 3 species, found on the coasts of Europe, one of them rang- 

 ing farther to the north than any other Labroid fish, (nerrpov, spine; 

 Labrus, an allied genus). 



