BROOK TROUT. 
97 
margined behind with black; ventral similar to pectoral but not so dusky; anal crimson, 
anterior ray white margined with black behind. Specimen 17^ inches long. 
Female . — Head, 4.1 in length without caudal; eye 7+ in head; snout, 3.65; upper jaw, 
1.72; lower jaw, 1.41; branchiostegals 12 and 11; gill-rakers 7 + 11 and 8 + 11. Body deep, 
symmetrical, the depth 3.86 in its length without caudal; caudal peduncle deep, its least depth 
equal to distance from adipose to upper base of caudal; dorsal rays 9, the longest 2.11 in head; 
distance from anal to lower base of caudal less than least depth of caudal peduncle, 2.43 in head; 
anal rays 9, the longest 1 .66 in head. 
Coloration . — Top of head and back dark olive green finely vermiculated with lighter olive 
and yellowish. Sides of body greenish olive with bright purple and bluish iridescent reflections, 
thickly spotted with yellow, and crimson spots with blue aureola; belly from line of upper base 
of pectoral grajnsh blue. Head dark olive with iridescence. Mandible bluish, tipped with 
olive; branchiostegals bluish. Dorsal color of back with similar rivulations, the anterior 
margin pale blue marked with dusky, extending as a narrow upper margin; adipose olive, 
vermiculated; caudal above similar to dorsal and vermiculated, shading into reddish, middle 
rays becoming a dull brick red on the lower third with faint fine irregular cross-markings. 
Terminal margin of tail black except at about upper one fifth; lower margin white with a line 
of black within. Pectoral, ventral, and anal dull brick red with bluish posterior angles; white 
anterior rays with black inner line; base of anal bluish. Specimen 17? inches long. 
Description of a Typical “Brook Trout.” 
Length, 6.66 inches. Head, 4.42 in length without caudal; depth, 3.42; eye, 5.25 in 
head; snout, 4.20; maxillary bone, 1.9; branchiostegals 10 on right side and 11 on left; gill- 
rakers very short and rather stout, 6 + 10 on each side; dorsal 9; anal 8; scales about 225. 
Head bluntly conic, mouth rather large, distance from tip of snout to posterior extremity of 
maxillary 1.61 in head; mandible, 1.44; eye moderate, distance between the eyes rather broad, 
3.23 in head; body rather slender, slightly compressed; lateral line with about 118 pores; cau- 
dal peduncle rather deep and compressed; dorsal moderate, when depressed the tips of first 
rays not nearly reaching tips of last, 2.25 in head; base 2.1; anal falcate, the first rays longest 
1.6 in head; when depressed reaching far beyond the tip of last rays, base 2.62 in head; pec- 
toral moderate, 1.68 in head; ventral 1.9. 
Head and body to some distance below lateral line brownish olive; vermiculated on top 
of head and back with yellowish markings; sides iridescent, bluish and green, with large yellow 
spots and some smaller red spots surrounded with pale blue aureola; lower jaw creamy white; 
throat and branchiostegals dusky; belly much punctulated with dusky, causing an irregular 
clouding, conforming somewhat to the dark parr marks, seven of which cross the sides; lower 
three fourths of dorsal with large black spots arranged in irregular rows, sometimes coalescing. 
