DURING THE AECTIC EXPEDITION. 



11 



29. From seventy-two fathoms at 83° 19 f N. lat., by Capt. 

 Markham : Coscinodiscus excentricus, Ehrb., and C. sub tills, Bail. 



List of Genera and Species of Diatoms. 



Achnanthes brevipes, Ag., 1, 7- 

 longipes. 



Achnanthidium arcticum,CZ.,ll, 25. 

 groenlandicum, CL, 8, 13, 14, 



18, 19. 

 Ampbiprora longa, CL, 8, 14, 25. 

 Nitzschioides, Cleve, 2, 5, 21 , 



Meridion circulare, Ag., 16. 

 Navicula ambigua, Ehb., 17- 



arctica, CL, 13, 25. 



■ borealis, # 2?A&., 16, 17. 



cryptocepbala, Ktz., 16, 1 7,22, 



23. 



didyma, Ehb., 4, 5, 8, 14, 25, 



26, 28. 

 Amphora affinis. 

 Eunotia, Cleve, 2,5,7,8, 24, 25. 



26. 



directa, Sm., 14. 



firraa. 



fortis, Greg., 10, 14. 



globiceps, Greg., 16. 



liber, Sm., 7, 28. 



mesolepta, Ehb., 17- 



— minutula, Sm., 27. 



— rhynococephala, Ktz., 1 . 



— Smithii, Brtb., 6, 8, 9, 11, 14, 

 19,11,25,26,28. 



— subsalina, Don/cin, 2, 7, 9, 10, 

 14,21,26,28. 



Coscinodiscus centralis, Ehb., 7, 1 1, Nitzschia angularis,Sra., 7,1 1,26, 28. 



closterium, Ehb., 2, 6, 26, 28. 



lanceolata, CL, 26, 28. 



Leighsmithiana, O'Meara, 13. 

 Biddulphia aurita, Lyngb., 6, 11, 13, 



14, 19,25. 

 Chaetoceros borealis, Bayl., 3. 



decipiens, CL, 3. 



Cocconeis arctica, CL, 8. 

 costata, Greg., 13, 14. , 



glacialis, CL, 25, 28. 



scutellura, 7, 13, 14, 24. 



25, 28. 



excentricus, Ehb., 5, 8, 9, 12, 

 14, 19, 20, 26, 28, 29. 

 — radiatus, Ehb., 4, 5, 7, 8, 9, 



10, 13, 14, 18, 19, 28. 



— subtilis, Ehb., 5, 9, 12, 13, 20, 



22, 28, 29. 

 Cy rubella maculata, Ktz., 17, 27. 

 Denticula frigida, Ktz., 17. 

 Diatoma elongatum, Ag., 1. 



sigma, Ktz. ,5, 10. 



Orthosira marina,Sm., 14,19, 25, 28. 

 Pleurosigma angulare. 



longum, Cleve, 2, 9, 10, 12, 



13,14,20,28. 

 Podosira hormoides, Ktz., 13, 11. 

 Podosphenia gracilis, Ehb., 13. 

 Raphoneis Quarnerensis, Grun., 5, 



8,25. 



Eunotia arcus, Sm., 1,16, 17,23,27. Rhabdonema arcuatum, -BTte., 13, 19. 



diodon, Ehb., 27. 



Torelli, CL, 13, 14, 24. 



Fragilaria oceanica, CL, 6, 12, 28. Rhoicosphenia curvata, Ktz.,\4,26. 



striatula, Lyngb., 3, 6, 9,12, 26. Stauroneis anceps, Ehb., 27. 



Grammatophora arctica, CL, 5, 7, 8, 



9,11, 13,28. 

 islandica, Ehb., 14. 



Melosira nummuloides, Lyngb., 5, 

 10, 12, 13, 14, 15. 



aspera, Ehb., 11. 



pulchella, Sm., 7. 



Surirella constricta. 



ovata, Ktz., 19. 



subsala, Sm., 1. 



