









ICHTHYOLOGY. 



47 



D 1, 9 ; A 1, 8 ; 6,1,9,8,1,5; V 9 ; P 17. 

 The color is reddish brown above, silvery on the sides, and whitish beneath. 

 Plate XXVII, fig. 1, represents Algansea tincella, size of life ; fig. 2 is a scale from the 

 dorsal region ; fig. 3, a scale from the lateral line ; and, fig. 4, a scale from the abdominal 



i 



region. 







List 



4 



of specimens. 







Catal. 



No. 



Cor'g No. 

 of teeth. 



No. of 

 spec. 



Age. 



Locality. 



When col- Whence obtained, 

 lected. ' 



Nature of 

 specimen. 



Collected by — 



195 



2753 



6 



Adult.. 



Near the City of 

 Mexico. 



1852 ■ Major Wm. Rich 



Alcoholic. 



Major Wm. Rich. . . 





1. AEGrYREUS OSCULUS, Grd. 

 Plate XXVII, Figs. 9—12. 



Spec. Char. — Has more the fascies of A. atronasus than of any other of its congeners, both by the outline of its body and 

 head, and the shape and position of the mouth. The head is comparatively small, forming the fifth of the length, with the 

 exception of the fork of the caudal. The eye is rather large and sub-circular, its diameter entering about four times in the 

 length of the side of the head. The dorsal and anal fins are well developed, the former being convex superiorly, and the latter 

 sub-convex exteriorly. The posterior margin of the caudal is crescentic. The posterior extremity of the ventrals extend as far 

 as the vent, which is not the case in A. dulcis and A. nubilis. 



Syn. — Jrgyreus osculus, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 186. 



The anterior two rays of both the dorsal and anal fins are mere rudiments, as elsewhere stated. 



D2,8; 



7; C5, 1, 9, 8, 1, 6; V8; P 14. 



The color is reddish brown above ; olivaceous on the sides, with numerous dark blotches and 

 dots. Beneath uniform yellowish white, or silvery white, 



Plate XXVII, fig. 9, represents Argyreus osculus, size of life ; fig. 10 is a scale from tho 

 dorsal region ; fig. 11, a scale from the lateral line ; and, fig. 12, a scale from the abdominal 

 region. 



List of specimens. 



Catal. 

 No. 



Cor'g No. No. of 

 of teeth, spec 



Locality 



When col- 



lected. 



Whence obtained 



50 



2663 



10 



Babocomori river, trib. of San 

 Pedro river : Gila. 



1851 



Col. J. D. Graham... 



Nature of 

 specimen. 



Alcoholic. 



Collected by 



Jno. H. Clark 





2. ARGYREUS NOTABILIS, Grd. 



Plate XXVII, Figs. 5—8. 



This species resembles A. oscvlus in many respects, but will always be easily distinguished 

 from it by a more truncated snout, and, consequently, by a mouth not so deeply cleft. The dorsal 

 fin is situated more anteriorly also. The scales are sub-elliptical, elongated, exhibiting some- 



