SELECTED WATER 

 RESOURCES ABSTRACTS 



INPUT TRANSACTION FORM 



/. Report No. 



3. Accession No. 



w 



4. Title BIOTA OF FRESHWATER ECOSYSTEMS IDENTIFICATION MANUAL 

 NO. 7. Freshwater Isopods (Asellidae) of North America, 



7. Autbor(s) Williams, W. D. 



5. Report Date 



6. 



8. Performing Organization 

 Report No. 



9. Organization Monash University, 

 Clayton, Victoria, 

 Australia 



12. Sponsoring Organization 

 IS. Supplementary Notes 



10. Pro 



'fSb^fr ELD 



//. Contract/Grant No. 

 14-12-894 



13. Type of Report and 

 Period Covered 



16. Abstract A key is given to the North American genera (Asellus and Liraeus) of 



asellid isopods. Another key is provided for the surface-living species 

 of Asellus but lack of clear, published morphological distinctions in 

 the genus Li-raeus prevents the construction of a key for that genus. 

 Notes on ecology, collection, preservation and identification are also 

 included. 



17a. Descriptors 



*Aquatic fauna, *Isopods, Distribution, Preservation, 



I7b.ldenti£ers * Identification Manual, *Illustrated key, *Asellidae, *North America, 

 Species List, Collection, 



17c. COWRR Field i Group j^q^ 



It. Availability 



19. Security Class. 

 (Report) 



20. Security Class. 

 (Page) 



Abstractor *>  °- WiHiams 



21. No. of 

 Pages 



22. Price 



Send To: 



WATER RESOURCES SCIENTrFlC rNFORMATION CENTER 

 US- DEPARTMENT OF THE INTERIOR 

 WASHINGTON. D, C 20240 



[institution Monash University, Victoria, Australia. 



WRSIC 102 (REV, JUNE 1971) 



» U. S. GOVERNMENT PRINTING OFFICE : 197J O - 46B-267 



