348 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



forced, I think it is time to stop. Tlius it seems to me that Schmidt's figure 34, ^though 

 clearly grading into N. lyra, would he more likely to be taken for N.forcipata Grev.^ 

 I therefore^ classify it so, Groville's species not being considen^d l)y anyone to bo 

 synonymous with N, lyni. Cleve gives 25 named varieties of N. hjm. I omit these. 

 They could easily be increased to 100; l)Ut our nomenclature will soon change from 

 binomial to trinomial if this plan beconu^s a general one. 



Found at stations 2G94H, 2807, 2808, 2S35, 2920H, :^0]:iIT, 3fi04, 3G35H, 4014II, 

 Galapagos Islands to Bering Sea and off Honshu Island, Japan. 



Navicula major Kutz. Bacill. 97. pi, 4.f. 19^20, 1844. Donk. Brit. Diat. 69, pL 11. f. 2, 



1871-73. Van Heur. Synop. 73. pi S.f, -M. 1881; Treat. Diat. 105. pi 2.f, 61L 



189C. Schmidt, Atlas pi 42. J. S. 1876 (all other figures doubtful). Pant. 



Beitr. Hacill. Ung. 3: pi 7-/ //./. 1893. De Toni, Syll. Alg. 2: 10. 1891. H. 



L. Smith, Sp. Diat. Typ, no. 291. 1874. Truan, Anal. Soc. Espan. Hist. Nat. 



13: 341. pi 7.f, 20, 1884. Pritch. Hist. Infus. ed. 4. 896. pi 7./ 65. 1861. 

 Frustuha major Kiilz. Linnaea 8; 547./. 25. 1833 ? 

 Pinnularia ?nnjor W. Smith, Synop. Brit. Diat. 1: 54. pi IS. f. 162, 1853. Rabh. 



Sussw. Diat. 42, j>l 6, f, 5, 1853. Cleve, Sv. Vet. Akad. Ilandl. 27'^: 89. pi h 



f. 22. 1895, 

 Navicida hcroina Schmidt, Atlaw pi 4-^.f. 2. 1876. 

 Navicula nobilis Ehrenb.; Brun, Diat. Alp. 84. pi 8,f, 1. 1880. 

 Navicula transversa Schmidt, Atlujs pi 4-^. f. 5-6, 1876 (?). 

 Navicula viridis Ehrenb. Infuw. 182. pi IS. J, 16 (not pi 21, f. 12). 1838, in part; 



Phys. Abh. Akad. Wiss. Beri. 1837: pi 1,J. 19. 1839. Bail. Am. Juurn. Sci, 



42: 96. ;>;. l,f. 16. 1842. 



Here we meet a problem of specific bmitation that is particidarly diflK-ult. I have in 

 the main followed the arrangement of ClevCj^ though it leaves much to be desired. 

 Pinnularia subanifa Eltrenb.f' I do not include liere. But aside from this, the quc^stion 

 of wliat distinction can be drawn between the above and AL dadylus (Ehrenlj.) Kiit/., 

 also N. nobilis (Ehrenb.) Kiitz., is not .satisfactorily answered. De Toni^ unites N. 

 dadylus and N. nobilis, but sei>arateti them from .V. major. All these, as well as figures 

 of N. viridis (Ehrenb.) Kutz. are without any lines of separation from ear'h othor. 

 Schmidt says/ ''Finn, viridis und itadylas, E., N. major und viridis, K. verschwimmen 

 so in einander, dass sich ein genug(^nder Nachweiss liber ilir Verhaltni.ss zu einander 

 gar nicht gebem liisst.** 



Found at stations 2848, 2929, south of Alaska peninsula and off southern California. 



Navicula nitescens (Grog.) Ralfs, Britcli. Ilist. Infus. ed. 4. 898. ]SG1. Donk. Brit, 

 Diat. 8. pi 1. f. 7. 1871-73. Schmidt, Atlas pi 7. / 37-41, pi 8. f. 14-I6 

 {unnamed^ 1875. Jan. & Rabh. in Ral>h. Beitr. 1:10. pi 2.J\ 7, 1863. O'Meara, 

 Proc. Roy. Irish Acad. II. 2: 389. pi 32, f. 32. 1875. De Toni, Ryll. Alg. 2: 91. 

 1891. Van Ileur. Tn^at. Diat. ]98. pi 26. f, 747. 1890. Pant. Beitr. liacill. Ung. 

 2: 53. pi 9 J. 16..L 1889. 



Diplonns nitescens Cleve, Sv. Vet. Akad. Handl. 26"-; 97. 1894. 



Navicula smithii I^reb. variety; Greg. Trans. Roy. Soc. Edinb. 21: 4S7.pl y.f. 16, 



1857. 



Navicida adriatica Grun. Verb. Zool. But. Ges. Wien 10: 525, pi l.f. 17. ISfiO. 

 Pinnularia arraniaisis O'Meura, Quart. Journ. Mier. Sci. 14: 11(5. pi 5. f. 6. 18G7. 



« Schmidt, Atla^ pi g.f, 34. 1875. 



ft Quart'. Journ. Micr. Sci. 7: 83. pi G.f. 10-11, 1859. 



cSv. Vet, Akad. UandL 27-^: 89. 1895. 



d Ehrenb. Mikrog. pi 35 A. VI. /. 12. 1854, and Schmidt, Atlas pi. 43. f. 31-33. 1870 

 eT>Q Toni, Syll. Alg. 2: 9. 1891. 

 /Atlas ;^Z. 42. f. 3. 1870. 



