142 



Cf/prlnus aundus, Ij. Sjst. Nat.. I. p. 527: Lacep. V. p.. 

 553; Cuv. & Val., XVI. p. 101. 



Found in moderate numbers in the Potomac raver^ south 

 of Alexandria, where it has been introduced from abroad. 

 fSpecimens from that locality are stout and clumsy, witli large 

 scales; and attain a length of at least one foot. 



Acad. Coll. S. I. 



EXOGLOSSUM, Eafinesque. 



E. maxiliingua. 



The lieight of the body is nearly one-fiftli of the total length 

 (without caudal fin), the length of the head a little less than 

 one-fourth. Caudal fin emarginate. Color olivaceous, smoky 

 above; a blackish band from pectoral fin to superior extremity 

 of gill opening. Length, 4 to 8 inches. 



Fin-rays:— D. 8; P. 12; V. 8; A. 8; C. 18. 



C. maxillingua, Guenther, VII, p. 188. 



Cyprinus 'maxillinqua, Lesueui', Journ. Ac. Nat. Sc. 

 Philad., I, p. 85. ' 



Exocjlossum maxillingua, Agass. Amor. Journ. Sc. & Arts, 

 1853, XIX. p. 215; Cope, Journ. Ac. Nat. Sc. Philad., 

 XIII. p. 360, pi. 11, fig. 1. 



Sykesville, in Piney-run, tributaries of Patai3sco Eiver, 

 GAvynn's Falls, above tide, Jones Falls and Pipe Creek. 



The shovel-shaped lower jaw of this species admirably 

 adapts it for lifting the small Physas and other shells from 

 the rocks; and it is in the rocky parts of our streams that it 

 is usually to be seen. 



Acad. Coll. S. I. 



SEMOTILUS, Eafinesque. 



1— S, rhotheus, 



Fall-Fish, Shiner, or Shining Dace, 



Body rather deep, compressed, elongate; its heigiit nearly 

 one-fourthi of total (without caudal.) Scales large, with the 

 free margins festooned with elevated radiate lines. The colors 

 are very brilliant, having as ground a very pure silver white; 

 the back is often steel-blue, and sides of head bright rose 



