417 



5. Planarian Worms. (Turbellaria) 



Several unidentified species. Common in the channel from 

 Spring Bay south ; and in outer zones from P. P. U. Bridge 

 south. 



6. Crustaceans. ( Amphipoda and Isopoda) 



Hyalclla knickcrbockcri Bate. Channel from Peoria Narrows 

 south ; outer zone, as far north, once, as below dam at Henry. 

 AscUus intcnncdiiis Forbes. Channel, Kingston Ferry. 



7. *Moss Animals. (Bryozoa) 



Plimiatclla f^riiiccf's Kraejielin. var. fniticosa. From Chilli- 

 cothe south, in the channel ; was noted to be especially toler- ' 

 ant, also, in the up])er river in 1911-1912, at that time occur- 

 ring as far north as Starved Rock, but incorrectly named. 

 A recorded occurrence in V.i'i'3 in the outer zone opposite 

 .\1 Fresco Park is probably an error, as the organism rerjuires 

 good current unless conditions are otherwise excellent. 



Plimiatclla priiiccf's Kraepelin, var. iiiiicosa-sf^oiu/iosii. Chan- 

 nel, Peoria Narrows south. 



PUtmatella polymovpha Kraejielin, var. repots. Channel. Wes- 

 ley south, in current. 



Paludicella ehrcnbergii van Benden. Channel, McKinley 

 Bridge south, in good current ; outer zone. Seven Mile Is- 

 land and Kingston and south. 



VrnatcUa gracilis Leidy. Channel at McKinley Bridge and 

 Pekin, in strong current. 



8. Caddis-fly Larvae. ( Trichoptera ) 



Hxdropsychc species. Channel. Peoria Narrows south, in cur- 

 rent ; outer zone at foot of Grand Island. 



Polyccntropus species. Channel, Copperas Creek below dam 

 and south, in current. 



Molaiiiia species. Near shore. Quiver Beach. Probably a 

 lake collection, as this is a sand beach form. 



Unidentified species. Unknown current-loving form at McKin- 

 ley Bridge in channel, and south ; one or two stagnant-water 



. species, with basket-shaped cases, in outer zones from Rome 

 south. 



9. .May-fly Nymphs (Ephemerida) 



Hcxageitia bilitieata Say, Channel at Havana and at hi;id of 

 Hickory Island : near shore, once at Pekin a\u\ once each 

 at foot of Grand I.^land and head of Hickory Island. 



• I think a better common name would be soft-w;ined or frish-watir ci.ral; 

 a.«! the group wa.s originally includiil with the iiiarin<- inralH by Klirenberi; about 

 a hundred years ago. 



