302 coNTRinrTioxs TO NORTH AMERICAN ICHTHYOLOGY iv. 



as the eye. extending past tlic front of the pupil, its supplemental bone 

 narrowly ovate, with prolonged joint; jaws equal when closed. Kye 

 large, as long as snout, 1.1 in head. Preorbital narrow: snpraorliital 

 elongate, rectangular. Scales anteriorly considerably enlarged, their 

 diameter hall' larger than the diameter of those on the caudal peduncle. 

 Color bluish above; sides white, punctate with tine dots; each scale 

 with a silvery area, these forming a series of distinct longitudinal 

 stripes. I Tead 4; depth 3. D. 11 ; A. 11; scales 8-74-7. L. 18 inches. 

 Great Lakes and northward. A handsome and well-marked species. 



(talma (Coregonnx) InJIihcc Ilirli. FMUIKI I5or.-Anior. iii, 201, 183IJ; Giiuthcr, vi, 199: 

 ArgyroxoniHs tullibec Jorduu, Man. Yrrl. :>(51.) 



147. TIIYMAtLUS Cnvier. 



Graylings. 



(Cuvii-r. Ur^iii- Amin. oil. 2, ii, 1^9: type Salmo thymaUits L.) 



Body oblong, compressed, little elevated. Head rather short. Month 

 moderate, terminal, the short maxillary extending past the middle of the 

 large eye, but not to its posterior 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. dill-openings wide. Branchiostegals 7 or 8. dill-rakers 

 short and rather stilt'. Suborbital and preorbital bones narrow. 

 Scales small and loose, 7.~>-100 in the course of the lateral line. Dorsal 

 lin very long and high, mostly in advance of the ventrals, of about L't) 

 rays: adipose I'm small; caudal fin forked ; anal fin small, of 10-15 

 rays. Coloration brilliant, the dorsal with red or blue spots. Pseu- 

 dobranehia- well developed. Air-bladder very large. Pylorie append- 

 ages about \~>. neantiful lishes of the fresh waters of northern regions.' 

 (^'-//.////.<-, the ( 1 reek name of the Grayling, the lish having the odor of 

 ' thyme n : ^ui-.] 



497. T. si^llifrr li'irlnmlsim. Amcrlcnn (I 



j 

 llody elongate, compressed, highest under the anterior portion of the 



dorsal. Head rather shoi t, snbeonic, com]ressed, its uppei- out line eon- 

 tinuoiis nith anterior curve of the back. ]\Iouth moderate, the maxil- 

 lary extending to below the middle of the eye: jaws about equal. 

 Tongue, in the young, \\ ith teeth v, liicli are usually absent in the adult. 

 K\e ipiile lai-gc, about .'5 in head, rather longer than snout, about equal 

 to the i.iterorbital space. Scales moderate, easily detached. Lateral 



