6 



Proceedings of the Biological Society of Washington. 



Schilbeodes insignis 

 Catostomus commersonii 

 Hypentelium nigricans 

 Semotilus corporalis 



atromaculatus 

 Leuciscus vandoisulus 

 Notemigonus crysoleucas 

 Pimephales notatus 

 Notropis procne 



hudsonius 



arge 



Notropis amoenus 



analostanus 

 cornutus 

 Ericymba buccata 

 Rhinichthys atronasus 

 cataractae 

 Hybopsis kentuckiensis 

 Exoglossum maxillingua 

 Percopsis omiscomaycus 

 Boleosoma olmstedi 

 Etheostoma flabellare 



Canal, 



The Chesapeake and Ohio Canal, if left undisturbed, would 

 soon become a fish paradise. It supports an abundant growth 

 of submerged vegetation, something the river in this region 

 almost entirely lacks. However it is drained everj^ winter and 

 fish can not become permanently established. Although this is 

 bad for the fishes, it is very good for collectors, and our records 

 are practically complete up to date. However, owing to the 

 way in which the canal is filled (diversion of river), its length, 

 and the number of tributaries, something new may turn up at 

 any time. Our notes refer to the level between locks 11 and 12, 

 a stretch bordering the property of the Washington Biologists' 

 Field Club. 



LIST OF SPECIES. 



Ictalurus punctatus 

 Ameiurus catus 



nebulosus 

 Schilbeodes insignis 

 Carpiodes cyprinus 

 Catostomus commersonii 

 Hypentelium nigricans 

 Erimyzon sucetta oblongus 

 Cyprinus carpio 

 Notemigonus crysoleucas 

 Notropis hudsonius 



amoenus 

 Rhinichthys cataractae 

 Anguilla rostrata 



Dorosoma cepedianum 

 Esox reticulatus 

 Pomoxis sparoides 

 annularis 

 Ambloplites rupestris 

 Chaenobryttus gulosus 

 Lepomis cyanellus 

 auritus 

 gibbosus 

 Micropterus dolomieu 

 Perca flavescens 

 Boleosoma olmstedi 

 Morone americana 



Channel between Plummers Island and Maryland Shore. 



In low water this channel is narrow enough to be crossed in 

 a single step at three different places. At such a stage the water 



