30 
BULLETIN OE THE BUREAU OF FISHERIES. 
Body rather elongate, somewhat compressed, its width about 2.4 in length of head; depth greatest 
cephalad of insertion of dorsal, seeming to taper posteriorly from somewhat larger head, but not always; 
caudal peduncle moderately elongate and not deep, compressed; head rather large, larger than in L. 
cyanopterus on average, but about same as L. prognathus, which is larger than usual ; snout proportion- 
ately long; maxillaries long, extending almost to below center of pupil, gape large; lower jaw equal to 
or longer than upper; distance from snout to occiput long, slightly more than half distance from occi- 
put to dorsal. Eye large in proportion to the larger head; dorsal surface of head slightly arched and 
convex between orbits. Lateral line -straight near center of body, scales moderate in size, loosely 
attached. Dorsal inserted nearer base of caudal, high, its longest ray about 1.6 in head, its base 2.5, its 
margin straight or slightly concave, the longest, first developed ray reaching beyond tip of last ray when 
supine; adipose rather large, but variable; caudal deeply forked; anal short, its longest ray about 0.66 
that of longest dorsal ray; ventrals long, reaching about 0.66 distance to anal; pectoral longer, reaching 
more than halfway to ventrals, the fin length variable, merging into that of other closely related species. 
Fig. 15. — Leucichtkys zeniihicus (Jordan & Bvermann). Lake Superior Longjaw. From the type. 
Color in spirits silvery, darker above, no stripes clearly visible along rows of scales; dorsal and anal 
broadly edged with dusky; other fins clear, save for occasional stipples of black. In life, clear metal- 
lic blue above, silvery below. 
Comparison 0} specimens of Leucichtliys zeniihicus. 
Marquette, Lake Superior. 
Duluth, Lake Superior. 
S pecimen no . . 
5238 
5236 
5241 
5237 
5215 
5221 
5219 
5216 
13084 
5269 
5257 
Length without cau- 
dal mm . . 
230 
247 
252 
253 
205 
255 
235 
240 
275 
240 
250 
Dorsal rays 
1 1 
1 1 
10 
IO 
II 
1 1 
1 1 
10 
1 1 
11 
IO 
Anal rays 
11 
1 1 
1 1 
12 
II 
11 
12 
12 
1 1 
1 1 
12 
Scales 
8-80-7 
8-78-7 
8-77-7 
8-83-7 
77 
83 
81 
78 
79 
80 
77 
Branchiostegals 
9 
9 
9 
9 
9 
9 
9 
9 
9 
9 
9 
Gillrakers 
16+26 
14 +28 
14 +26 
15 +26 
14 +26 
14+25 
14+24 
14+26 
14+27 
14+26 
14+26 
Sexual condition 
9 
9 
Ripe 9 
9 
9 
Ripe $ 
9 
9 
Ripe 9 
9 
9 
Comparative measure- 
ments: a 
Head 
0. 26 
0. 25 
O. 26 
0. 25 
0. 26 
0. 26 
0. 26 
0. 255 
0. 25 
0. 26 
O- 253 
Depth 
. 21 
• 23 
. 26 
. 21 
. 22 
• 245 
. 22 
. 2 2 
. 21 
. 225 
. 21 
Caudal peduncle — 
Length 
. 10 
ns 
• 105 
. 11 
. 11 
. 105 
. 1 1 
. 1 1 
. 10 
• IIS 
. II 
Depth 
• 07 
• 075 
• 075 
. 075 
• 075 
.08 
. 08 
■ 075 
• 075 
■ 075 
. 07 
Eye 
. 06 
■ 055 
• 055 
. 06 
. 06 
. 06 
. 06 
• 055 
• 055 
. 058 
• 055 
Snout 
• 075 
• 07 
■ 07s 
• 07s 
• 075 
• 075 
• 075 
■ 07 
• 075 
. 08 
. 08 
Maxillary from tip of 
snout 
. 10 
. 1 1 
. I I 
. IO 
• 105 
. 10 
. 1 1 
. 10 
. 105 
. II 
■ 105 
Snout to occiput 
• 19 
. 18 
. 18 
. 20 
.185 
. 18 
. 185 
.185 
. 18 
. 18 
■ 19 
Pectoral length 
• 17 
. 18 
• 175 
• 19 
• 17 
. 17 
• 19 
. 185 
. 16 
• 17 
• 17 
Ventral length 
■ 155 
• 17 
• 17 
. 18 
. 17 
• 17 
• 17 
• 17 
• 15 
.165 
• 17 
Dorsal height 
• 15 
. 16 
• 165 
. l6 
• 17 
. 16 
. 165 
. 16 
■ IS 
. 16 
• 17 
Anal height 
. 10 
. 10 
. I I 
• 09 
. 10 
• 09 
. 10 
. 1 1 
• 095 
. IO 
. IO 
a Measurements in hundredths of body lengths unless otherwise specified. 
& From last of anal to first of caudal. 
