iilS >NTRIBUTIONS PBOlfl l in. NATIONAL EERBABIT7M. 



forced, 1 think it is time to stop Thus it seems to me that Schmidt's figure 34,° though 

 clearly grading into A. lyra, would be more likely to be taken foi ' 

 I therefore classify it so, Greville'e species not being considered by anyone i" be 

 synonymous with A /</•■</. Cleve gives 25 named varieties "i Y lyra. 1 • • i ■ i i i these. 

 I'll- \ could easily be increased to l<><>: but our nomenclature will soon change From 

 binomial t" trinomial ii this plan becomes a general one. 



Pound at stations 2694H, 2807, 2808 I20H, 3013H, 3604, 3635H, KM ill. 



Galapagos [slande i" Bering Sea and off Honshu [sland, Japan. 



Navicula major Km/ Bacill. 97. pi. I f. 19 :>>. 184 I Donk. Brit. Diat. 89. pi. 1 1 ../'. .'. 

 L871 73. Van Heur. Synop. 73. pi. S.f ■ | 1881 Treat hi..! L65. pi 

 1896 Schmidt, Atlas pi. ,.'./' 8. 1876 all other figures doubtful) Pant. 

 Beitr. Bacill. Qng. 3: { >l. l.f. //.;. 1893. DeToni, Syll Ug. 2: 10. 1891. II. 

 1.. Smith, Sp. Diat. Typ. no. 294 1874. Truan, Anal Soc. Eepan. Hist. Nat. 

 13: 341. pi : ./' 10. L884. Pritch. Bist. Enfus. "I I B96. pi l.f. 65. 1861. 

 / istuliamajor Kin.-. Linnaea 8: 547./. 15. 181 



Pinnularia major W. Smith, Synop. Brit. Diat. 1: 54. /</. 18. f. 162. L853. rtabh. 

 Sussw. Diat. 42. j>I. S.f. 5. L853. Cleve, Sv. Vet. Akad. Handl. 27 : 89. pi. /. 

 /. 

 Navtcula heroina Schmidt, Atlas pZ. | I ./ : L876. 

 JVavtcuXa nobUis Ehrenb.; Brun, Diat. Alp. 84. pi 8.f. i. L880. 

 cula transversa Schmidt, Atlas/-/. \3.f.5 >.. L876 



cufa iririrfu Ehrenb. Enfus. L82. pi IS.f. 16 (not pi. M. /. /.' I. 1838, in part; 



Phys. Abh. Akad. Wiss. Berl. 1837: pi l.f. 19. L839. Bail. Am. Journ. Sci. 



42: 96. pi l.f. 16. L842. 



Here we meet a problem of specific limitation that is particularly difficult. I have in 



the main followed the arrangement of Cleve, « though it leaves much to be desired. 



Pinnularia subacute Ehrenb.d 1 do not include here. Bui aside from this, the question 



of what distinction can be drawn between the above and .V. dactylus Ehrenb. i Kin/.., 



also N. nobilis (Ehrenb.) Kiit/... is not satisfactorily answered. Do Toni< unit.- A'. 



dad /////. v and A", nobilis, but separates them from .V. major. All these, a- well as figures 



.,]" A. vvridis Ehrenb.) Kiit/.. an- without any lines of separation from each other. 



Schmidt Bays/ "Pinn. vvridis und dactylus, E., A', major und vvridis, K. verschwimmen 



so in einander, dass Bich ein genugender Nachweies ftber ihr Verhaltnise zu einander 



gar nicht geben lasst." 



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



Navicula nitescens Greg. RaltV. Pritch. Bist. Infus. ed. 4. 898. L861. Donk. Brit. 

 Diat 8. pi 1. J. 1. L871 73. Schmidt. Atlas pi l.f. 31 il. pi s.f. : 

 unnamed .1875. Jan. 6Rabh. in Rabh. Beitr. 1: 10. pi 2. f 7. 1863. O'Meara, 

 Proc. Roy. Erish Acad. II. 2: 389. pl.82.f.82. 1875. DeToni, Syll. Alg. 2: 91. 

 1891. Van Hour. Treat. Diat. IDs. pi :>,.(. ;,;. lsiiii. Pant. Beitr. Bacill. [Jng. 

 2: 53. i>!. u.f. 1 1,;. L889. 



Diploneu nitescens Cleve, Sv. Vet. Akad. Handl. 26 J : i»7. 1894. 



Navicula smitkvi Breb. variety; Greg. Trans. Hoy. Soc. Eklinb. 21: 487. pi .*./■ 16. 

 1857. 



Navicula adriatica Grun. Verh. Zool. Bot. Ges. Wien 10: 525. /.. l.f. r. . I860. 



Pinnularia arraniensis O'Meara, Quart. Journ. Micr. Sci. 14: 116. j>l. :,. f. 6. i s, >7. 



aSchmidt, Atlas />l. l.f. 5 '.. IS75. 



bQuart. Journ. Micr. Sci. 7: 83. pi 6.f. to 11. L859. 



<Sv. V.-i. Akad. Bandl. 27 : 89. i- 



<* Ehrenb. Mikrog. pi SSA.YI.f. 12. L854, and Schmidt, Atlas pi. 43. f. 81 83. 1876. 



i D Toni, Syll. Alg. 2: 9. L891. 



y Ath»> pi. 42. f. 8. L876. 



