SALMONOIDE.E. 



177 



appophyses ; their tips go beyond the posterior orbitar-bones and reach nearly to the articu- 

 lation of the lower jaw. The distance between the tip of the snout and the extremity of the 

 labial equals the length of the upper surface of the head, and the lower jaw is about two lines 

 longer. 



Teeth rather long, slender, acute, and slightly curved, those on the labials smaller : the pala- 

 tine teeth run far back on a slightly prominent ridge, and there is a triangular cluster of about 

 ten teeth on the anterior part of the vomer. The tongue is armed with six teeth on each side. 



Gill-covers. — Interoperculum short and triangular. Preoperculum narrow and much 

 curved, with an even edge. The suboperculum is half as high as the operculum, and its angle 

 touches the preoperculum. The right gill-membrane contains twelve rays. 



Fins.— Br. 12; P. 13; D. 11—0; V.Sov 9; A. 10; C. 19|. 



The fifth dorsal ray is the longest, the first being almost imperceptible in a recent fish. 

 The adipose fin is about its own breadth behind the anal. The latter equals, or rather ex- 

 ceeds the dorsal in the length of its rays, and is more remote from the caudal than usual, 

 there being almost twice the length of its insertion between it and the base of the latter. 



Scales small, roundish, in contact, but not tiled, and firmly imbedded in a mucous epidermis 

 which almost conceals them : they are smallest on the forepart of the belly. There are 244 

 rows of scales meeting at the lateral line, which contains only 116: these are longer than the 

 ordinary scales, and have each a mucous canal elevated above its surface. A vertical row 

 under the dorsal contains 95 scales, viz., 41 above the lateral line, 42 between it and the upper 

 edge of the ventral, and 12 below the level of the first ray of that fin. 



Colour. — (" Back mottled, pale and brown : sides dark brown with yellow and red spots 

 above and below the lateral line, the yellow surrounding the red, which appears like scarlet 

 dots : sides of the belly orange-red : lowest part of the abdomen whitish with a smutty tinge. 

 First rays of the pectoral, ventral, and anal fins white, the second black, the rest purplish- red : 

 dorsal fin mottled with yellowish and black. Eyes large and pale." Dr. Mitchill.) 



Dimensions 

 Of a prepared Lake Huron specimen. 





""I 



nches. 



Lines. 









Inches. 



Lines. 



Length 



from tip of snout to tip of caudal . 



14 



3 



Length of attachment of dorsal . 





1 



4 



„ 



„ end of central caudal rays 



14 







55 



its longest rays 





1 



5| 



»> 



„ end of scales 



13 







35 



its last ray 









8 



» 



,, anus .... 



9 



2 



71 



adipose fin . 









5 



» 



., commencement of dorsal 



5 



10 



35 



pectorals 





1 



84 



» 



„ edge of suboperculum 



2 



9 



33 



ventrals 





1 



4 



» 



„ nape . 



1 



8* 



53 



ventral appendages . . 









4f 



V 



„ centre of pupil 







11 



35 



attachment of anal 





1 



1 



,' 



„ edge of orbit 







9 



55 



its longest ray 





1 



n 



it 



from centre of pupil to edge of sub- 







53 



its last ray . 









6 



operculum ..... 



1 



m 



11 



lobes of caudal 





2 







u 



posterior edge of orbit to ditto 



1 



n 



55 



its longest rays 





1 



8 



IT 



of transverse axis of orbit . 







H 



55 



its middle rays 





. 1 







*> 



vertical ditto . 







4$ 



Depth of 



caudal fork . 









5 



33 



intermaxillary 







4 



Distance from anus to tip of caudal 





5 



1 



33 



labial . 



1 



5 



35 



anal to lower caudal tip 





4 







>t 



lower jaw .... 



1 



9 



55 



adipose to upper tip of caudal 



3 



7 



33 



toothed margin of ditto 







11 



Depth of 



body at the dorsal 



2 A 



1 



8 



