76 PERCID^. 



on the under margin. Lateral line? Caeca? First dorsal with 

 three rows of large round black spots, the second with four streaks 

 of the same colour. 

 Canada (Quebec). 



6. Lucioperca grisea. 



Dekay, New York Fauna, Fishes, p. 19. 



D. 14I-H-. A.-?-. 



I 17-18 11-12 



Operculum with an acute spine behind, above and beneath which 

 is a very small one ; crown partly, operculum, pr»- and suboper- 

 culum entirely covered Avith scales ; 105 transverse rows of scales ; 

 seven caeca pylorica. All the fins black-spotted. 



Fresh waters of the Northern parts of the United States. 



a. Adult. Ohio. From Mr, Frank's Collection as Perca umericana. 



h. Intestines of the Lame. 



c. Adult: skin. Ohio. From Dr. Pamell's Collection. 



12. PILEOMA. 



Pileoma, Dekay, New York Fauna, Fishes, p. 16. 



Six branchiostcgals. AU the teeth minute, villiform, without 

 canines ; teeth on the palatines and on the vomer. Operculum with 

 a spine, praeoperculum entire. Two separate dorsals, the first with 

 fourteen or fifteen spines ; spines of the anal indistinct. Scales of 

 moderate or rather smaU size. No air-bladder. 



Fresh waters of North America. 



1. Pileoma semifasciatnin. 



Pileoma semifasciata, Dekay, I. c. pi. 50. f. 162. 

 ? zebra, Agass. Lake Super, p. 308. pi. 4, f. 4. 



D. 14 I 15-16. A. 10. 



The height of the body is one-sixth of the total length, the length 

 of the head one-fifth ; the interspace between the eyes is nearly as 

 broad as their diameter long. Body \vith narrow black cross-bars, 

 alternately longer and shorter. 



a, h. Adult : skins. Lake Erie. From Dr. Pamell's Collection. 

 c. Adult : skins. Ohio Canal. From Dr. Pamell's Collection. 



2. Pileoma carbonarium. 



Baird ^ Girard, Proc. Ac. Nat. Sc. Philad. 1863, p. 387. 

 D. 15 I 13. A. 11. 



The length of the Jiead one-fifth of the total. Body with trans- 

 verse bars of black a black spot at the base of the caudal, tlio 

 latter barred ; bjise of dorsriK «nal, and vcntrals black. {B. ^- G.) 



Kio Salado (Texas) 



