302 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



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



narrowly ovate, with prolonged foint; jaws equal when closed. Eye 



large, as long as snout, 4 J in head. Preorbital narrow; supraorbital 



elongate, rectangular. Scales anteriorly considerably enlarged, their 



diameter half larger than the diameter of those on the caudal peduncle. 



Color bluish 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. D. 11 ; A. 11 ; scales 8-74-7. L. 18 inches. 



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



{Salmo (Coregonus) tuUihee Rich. Fauna Bor.-Amer. iii, 201, 183G; Giluther, vi, 199: 

 Argyrosomits tuUibee Jordan, Man. Vert. 361.) 



147.— THYMAI^LUS Cuvier. 

 Graylings. 



(Cuvier, E(>gne Aiiim. ed. 2, ii, 1829: type Salmo thymallus L.) 



Body 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 iiosterior margin. Teeth slender and sparse on 

 the maxillaries, premaxillaries, and lower jaw; vomer short, with a 

 small i)atch 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 jireorbital bones narrow. 

 Scales small and loose, 75-100 in the course of the lateral line. Dorsal 

 fin very long and high, mostly in advance of the ventrals, of about 20 

 rays; adipose fin small; caudal fin forked; anal fin small, of 10-15 

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

 dobranchise well developed. Air-bladder very large. Pyloric append- 

 ages about 15. Beautiful fishes of the fresh waters of northern regions. 

 (^6/jtaAAoc, the Greek name of the Grayling, the fish having the odor of 

 thyme — Ou/jm^.) 



4J>'7. T. SflgBBifer Richardson.— Jmen'cflw Grayling. 



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

 dorsal. Head rather short, subconic, compressed, 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 



