385 



sen dredge in the lower lake in the summer of 1922. The fact that the 

 full Danglade list for Peoria Lake, inclusive of Chillicothe, of forty- 

 one species, was only eight short of his complete list of forty-nine 

 kinds for the entire Illinois River in 1911-1912 does not suggest that 

 the channel areas of Peoria Lake had been seriously injured up to 

 that time, although the Chillicothe list had already apparently suffered 

 some reduction. 



Mussels Reported by Danglade (1914) from Peoria Lake, Inclusive 

 OF Chillicothe, in 1911-1912, but wmcii Appear to ha\-b Since 



BEEN C0>IPLETELY EXTERMINATED ABOVE PeORIA NaUBOVPS, AND 



TO HAVE Nearly All Perished in the Lower Lake 



The three species of which we obtained records in the lower lake in 1920 

 and 1922 are starred; those taken or seen by Danglade both at Chillicothe 

 and in the lake below there, or at Chillicothe only, are marked with a C. 

 No. 16 was taken at Chillicothe only. 



1. Quadrula granifera. C 



2. Quadrula ebena. C. 



3. Quadrula plena 



4. Quadrula solida 



5. Quadrula coccinea 



6. Quadrula obliqua 



7. Quadrula trigona. 



8. Quadrula rubiginosa 

 *9. Quadrula pusiulosa. C 



10. Quadrula fragosa 



11. Quadrula lachrymosa. C 



12. Quadrula metanevra 



13. Quadrula heros. C 



14. Quadrula undulata. C 

 •15. Quadrula plicata. C 



16. Unio crassidens. C 



17. Unio gibbosus. C 



18. Symphynota complanata 



19. Arcidens confragosus. C 



20. Anodonta corpulenta 



21. Anodonta suborbiculata 



*22. Anodonta imbecilis 



23. Strophitus edentulus 



24. Obliquaria reflexa. C 



25. Tritigonia tiiberculata 



26. Plagiola donacitormis 



27. Plagiola elegans 



28. Plagiola securis. C 



29. Obovaria ellipsis ■ 



30. Lampsilis laevissima 



31. Lanip.silis gracilis. C 



32. Lampsilis alata 



33. Lampsilis parva 



34. Lampsilis recta, C 



35. Lampsilis fallaciosa. 



36. Lampsilis anodontoides 



37. Lampsilis higginsi. C 



38. Lampsilis orbiculata. C 



39. Lampsilis ligamentina. i 



40. Lampsilis luteola. C 



41. Lampsilis ventricosa 



