494 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



having been taken from the published works of Sars, Stebbing, Nor- 

 man and Stebbing, Hansen, Schia?dte and Meinert, and Budde-Lund. 



Some of the species herein described appeared in the diagnosis by 

 the author of North American Isopoda. ^ 



The present paper is based on material contained in the U. S. Na- 

 tional Museum. 



LIST OF TRIBES, FAMILIES, GENEEA, AND SPECIES. 



Page. 



I. Chelifera or Tanaioidea 500 



Family I. Tanaidte 500 



1. Tanais 501 



1. robustus Moore 501 



2. cavolinii Milne-Edwards 501 



2. Cryptocope 502 



3. arctica Hansen 502 



3. Leptognathia 502 



4. coeca ( Harger ) 502 



5. longiremis (Lilljeborg) 502 



4. Alaotanais -. 502 



6. hastiger Norman and Stebbing 502 



5. Heterotanais 503 



7. limicola ( Harger) 503 



6. Leptochelia 503 



8. rapax Harger 503 



9. suvignyl ( Kr0yer) 503 



10. minuta Dana 503 



11. dubia ( Kr0yer ) 504 



12. ffilum (Stimpson) 504 



7. Neotanais 504 



13. americanus Beddard 504 



Family II. Apseudidse 504 



8. Apseudes 505 



14. gracilis Norman and Stebbing 505 



9. Typldapseudes 505 



15. nereus Beddard 505 



10. Sphyrapus 505 



16. malleolus Norman and Stebbing 505 



II. Flabellifera or Cymothoidea 505 



Family III. Gnathiidse 506 



11. Gnathia 506 



17. cristata ( Hansen ) 506 



18. elongata ( Kr0yer ) 507 



19. cerina (Stimpson) 507 



Family IV. Anthuridse 507 



12. Anthura 508 



20. tenuis (Harger) 508 



13. Cyathura 508 



21. carinata (Kr0yer) 508 



14. Anthelura 508 



22. ahyssorum Norman and Stebbing 508 



1 American Natm-alist, XXXIV, 1900, pp. 207-230, 295-309. 



