2462 Bulletin ^7, United States National Museum. 



late ; pectorals moderate, inserted rather high, its outline rounded ; ven- 

 tral fins small, of 3 or 4 rays. Scales small and embedded, present on part 

 or all of the body, the scaly area more extensive in the adult than in the 

 young. Lateral line faint, sometimes obsolete, normally bent downward 

 behind pectorals and following ventral outline, sometimes with an acces- 

 sory branch following middle of side; the median branch usually want- 

 ing. No air bladder; no anal papilla; pyloric caeca 2 or none. Species 

 numerous, chiefly of the northern seas, inhabiting considerable depths. 

 In general, the male has the head and mouth larger than the female, and 

 the lips thickened. (XvK<bdrj$, wolfish.) 



LYCODES : * 

 I. Trunk more or less completely scaled. 



a. Dorsal rays about 115; anal rays 90 to 105. 

 b. Head 4 to 5 in length ; depth 1 to 8. 

 c. Nape wholly scaly. 



d. Lateral line double, with a median and a ventral branch ; pectoral 

 rays 22; body blackish with yellowish cross bands or series of 



Spots. ESMARKII, 2817. 



dd. Lateral line simple, ventral; body blackish, the young with 6 



darker cross bands. VAHLII, 2818. 



cc. Nape naked ; lateral line obsolete ; color plain brown, the fins edged 



with darker, pectoral rays 21 ; ventrals short. CONCOLOR, 2819. 



bb. Head 5f in length ; depth 9 ; a naked area around dorsal ; pectoral rays 19 ; 



lateral line ventral ; color brownish mottled, the young barred ; a black 



blotch at front of dorsal. ZOARCHCS, 2820. 



aa. Dorsal rays 85 to 105; anal rays 68 to 93. 



e. Head large, 3f to 4^ in length ; ventrals about as long as eye ; depth 8 to 9 



in length; body chiefly scaly, the fins naked. 



/. Body brownish, with a fine network of black lines on head and body, 

 those on body in 5 groups ; dorsal edged with black ; lateral line prob- 

 ably developed anteriorly only, figured as median ; pectorals broad, 

 of about 23 rays. RETICULATUS, 2821. 



ff. Body not covered with a network of black lines. 



g. Color pale, with dark bands and 2 ocellated spots on the forehead ; 

 pectoral rays about 17 ; lateral line figured as lateral. 



PERSPICILLUM, 2822. 



gg. Color grayish, without bands or spots; pectoral rays about 20; 

 lateral line single, ventral. FRIGIDUS, 2823. 



ee. Head short, 5 to 5 in length. 



h. Pectoral broad, of 23 or 24 rays; lateral line single, ventral; color 



plain. TERRJE-NOVS:, 2824. 



hh. Pectorals narrow, of about 18 rays; ventral fins shorter than eye; 



lateral line obsolete, or nearly so. 



i. Dorsal rays 101 to 105; anal rays 81 to 90; dorsal and anal with- 

 out dark markings ; ventrals more than length of eye ; jaws 

 with enlarged flaps of skin. 



j. Body in adult not barred, but with 4 dark longitudinal 



stripes. DIGITATUS, 2825. 



jj. Body with 14 to 16 pale crossbars above, which disappeal 



in the adult. PALEARIS. 2826. 



ii. Dorsal rays 85 ; anal 74 ; ventrals minute, not J length of eye ; 



flaps of jaws narrow or obsolete. BREVIPES, 2827. 



* The analytical key to the species here given is far from satisfactory. The species 

 should be divided into groups distinguished by the development of the lateral line and 

 the breadth of the pectoral ; unfortunately the last-named character has been neglected 

 in most of the current descriptions; we have examined all the species accessible to us. 



