252 PEECID^. 



account of the absence of the canine teeth, refer it to that genus. 

 Therefore, although not having a skeleton of Oligorus macquariensis, 

 I think it nevertheless best to combine both fishes, on account of the 

 similarity in the structure of their teeth, of their branchiostegals, 

 and of their fins, as well as in their general habit, size, and native 

 country. 



51. GRYSTES*. 



Grystes, sp., Cuv. Sf Val. iii. p. 64. 



Six or seven branchiostegals. All the teeth villiform, without 

 canines ; teeth on the palatine bones ; tongue smooth. One dorsal, 

 with ten spines, the anal fin with three. Operculum with two 

 points, praeoperculum with a single smooth-edged ridge. Scales 

 moderate. The number of the pyloric appendages increased. Air- 

 bladder simple, shghtly notched behind. 



Rivers of the United States. 



1. Grystes salmouoides. 



Labrus salmoides, Lac&p. iv. pp. 716, 717. pi. 5. f. 2. 



Cichla variabilis, Lesiieur, Journ. Acad. Nat. Sc. PhUad. 



Grvetes salmoides, Cuv. 8f Val. iii. p. 54. pi. 45 ; Rhgne Anim. III. 

 Poiss. pi. 9 a. f. 2 ; Dehay, New York Fauna, Fishes, pi. 69. f. 223 

 (cop.); Holbr. Ichth. S. Carol, p. 25. pi. 4. f. 2 (dorsal wrong). 



Micropterus, Cuv. ^ Val. v. p. 9 (founded on a mutilated specimen). 



B. 6-7. D. , '" A. -^^. L. lat. 90. Caec. pylor. 14 and more. 



13-14 11-12 ^•' 



The height of the body is nearly one-fourth of the total length, 

 the length of the head is contained 3| therein. Lower jaw pro- 

 minent. Praeoperculum and supraseapula entire, operculum with 

 two spines ; prseorbital without or with some slight denticulations ; 

 pectoral and ventral fins short ; the fourth dorsal spine longest ; the 

 second of the anal much shorter than the third ; caudalis slightly 

 notched. Uniform greenish brown, with a black spot at the pos- 

 terior angle of the operculum. Young with many indistinct longi- 

 tudinal streaks. 



Fresh waters of the United States. 



Or-h. Adult and half-grown : skins. Lake Erie. From Dr. Pamell's 

 Collection. 



52. ARRIPIS. 



Centropristes, sp., Cuv. <^- Val. iii. p. 50, vii. p. 451 ; Richardson, Voy. 



Ereh. Sf Terr. Fishes, pp. 29, 117. 

 Arripis, Jenxjns, Zool. Beagle, Fishes, p. 14. 

 Homodon, Brisout de Barneville, Rev. Zool. 1847, p. 133. 



Seven branchiostegals. All the teeth card-like or villiform, with- 



* 1. Grystes nuecensis, Baird ^ Girard, Proc. Acad. Nat. Sc. Philad. 1864, 

 p. 25. 

 2. Grjstes faaciatus, Eoffm Ninth Smithson. Report, p. 289. — Ohio. 



