I 
302 CONTRIIU'TIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
as the eve, extending; past tlie front of tlie pupil, its supplemental bono 
narrowly ovate, with prolonged i ointj jaws equal when closed. Eye 
larjre, as lonj;- as snout, 4;V in head. Preorbital narrow; supraorbital 
elon-iiite, rectanj;nlar. Seales anteriorly eonsidorably enlarged, their 
diatnet(T half larger than the diameter of those on the caudal peduncle. 
Color Idnish above; sides white, punctate with fine dots; each scale 
with a silvery area, these forming a series of distinct longitudinal 
stripes. Head 4 ; depth 3. 1). 11 ; A. 11 ; scales 8-74-7. L. 18 inches, 
tlreat Lakes and northward. A handsome and well-marked species. 
(Sahno (Corcgomts) tiillihee Rich. Fauna Ror.-Amer. iii, 201, 183G; Gunther, vi, 109: 
Aryyronomus tulUbcc Joi dim, Man. 1 ert. 301.) 
147.— TIIYillALMJS Cuvier. 
Graylings. 
(Cuvier, R^gne Auim. ed. 2, ii, 1829: type Salmo thymallus L.) 
Eody oblong, compressed, little elevated. Head rather short. Mouth 
moderate, terminal, the short maxillary extending past the middle of the 
large eye, but not to its imsterior margin. Teeth slender and sparse on 
the maxillaries, premaxillaries, and lower jaw; vomer short, with a 
small patch of teeth; teeth on the palatines; tongue toothless, or 
nearly so. Gill-openings wide. Branchiostegals 7 or 8. Gill-rakers 
short and rather stiff. Suborbital and i)reorbital bones narrow. 
Scales small and loose, 75-100 in the course of the lateral line. Dorsal 
tin very long and high, mostly in advance of the veutrals, of about 20 
rays; adipose tin small; caudal tin forked; anal tin small, of 10-15 
rays. Coloration brilliant, the dorsal with red or blue spots. Pseu- 
dobranchiie well developed. Air-bladder very large. Py loric append- 
ages about’ 15. Beautiful fishes of the fresh waters of northern regions. 
{Oufia/Miq., the Greek name of the Grayling, the fish having the odor of 
thyme — Ou/kx;.) 
497. T. sigiiifei’ Richardson. — American Grayling. 
Body elongate, compressed, highest under the anterior portion of the 
dorsal. Head rather short, subconic, compres.sed, its upper outline con- 
tinuous with anterior curve of the back. Mouth moderate, the maxil- 
lary extending to below the middle of the eye; jaws about equal. 
Tongue, in the young, with teeth which are usually absent in the adult. 
Eye quite large, about 3 in head, rather longer than snout, about equal 
to the interorbital space. Scales moderate, easily detached. Lateral 
