.MANN DIATOMS OF THE ALBATROSS VOYAGES. 345 



The name here given refers to its resemblance in outline and convexity to the water- 

 beetle, < ryrinida. 



Type in the (J. S. National Museum, No.5901 16, from station 2807, 1 ralapagoe Islands, 

 April 1. L888; 812 fathoms, bottom of Globigerina, ooze and coral mud. 

 Navicula hennedyi W. Smith, Synop. Brit. Diat. 2:93. 1853 Greg Trans. Mici 

 Lond. n. b. 4: 40. j>l. 5.J 3 \<<<>. Grun. Verh. Zool. Bot. Ges. Wien 10: 

 r l. /./*. U 12. I860. I >< .nk. Brit. Diat. LI. pZ. l.f.S. 1^71 73. Schmidt, Jahr< 

 Komm. Deut. Meere 2: 89. pi /. ./'. ,/. L874. Schmidt, Atlas pi S. f. S ■'>. i: . 18. 

 L875; pi 129. f. 10. L888. Van Beur. Synop. 93. pi 9. i /. L88] Treal Diat. 

 204. pi /.,/'. 160, pi 27. f. 755. L896. Jan. Diat. Gaz. Exped. pJ. /5./. /;. Pritch. 

 11,. i [nfus. -1. I. 898. pi . . ./' '■'. L861. Witt, Verh. Russ Mm Ges. II. 2: 29. />/. 

 r 5. L886. O'Meara, Proc. Roy. [rish Acad. II. 2: 387. pi 3 1875. 



Rabh. Fl. Eur. Alg. 1: L78. L864. Leud.-Fort. Mem. Soc. Emul. St. Brieu 

 pi 8. /'. 88. L879 CV Paul. P.eitr. Bacill. Qng. 2: 17. pZ. /.'./. 107. 

 Cleve, Sv. Vet. Akad. Eandl. 18 5 : 7. pi /../". r, 15 nol pZ. .-. /. 19 

 27 ■■: 57. L895; 26-: ///. .;./. /.;. L894. De Toni, Syll. Alg. 2: L03. L891. Petit, 

 Fondsdela Mer3: L82. pi ;../'. IS. 1-77 

 Navicula nebulosa Greg. Trans. Roy. Soc. Edinb. 21: 480. pZ. 9./. S. L857. Donk. 

 Brit. Diat. 11. pi. .'../'. .'. L871 73. Schmidt, Atlas pl.S.f. /;. L875; pi 

 L881 Cf. Van Beur. Treat. Diat. 204. pi 27. f. 755. - 

 Navicula californica Grev. Edinb. New Phil. Journ. n. b. 10: 29. pZ. I. f. 5. L859. 



Grun.; Schmidt, AtlaspZ. 5./ 6, /'*. L875. 

 Xmirul,, polysticta Grev. err. det. Schmidt, Atlas pl.S.f. 16 18. L875. Sclimi.lt, 

 Jahresb. Komm: Deut. Meere 2: 89. pZ. 1. f. S6, .:. L874. Cf. Edinb. New Phil. 

 Journ. 10: 28. />/. .../■. /. 1S.59. 

 Navicula bacUlifera Pant. Beitr. Bacill. Ung. 2: 42. pZ. 5./. 50. L889. 

 Navicula {hennedyi var. ?) caliginosa Cleve. & Grove, Le Diatomiste 1: 67. pZ. /". 



/. v. L891. 

 Navicula perennis Pant. Beitr. Bacill. Ong. 3: /</. .;/./. 560. 1^»:'>. 

 This widely distributed diatom is mosl variable and grades off so gradually into forms 

 bo differenl from the type that it is out of the question to draw a boundary line around 

 tin- species. It merges inn. N. i>ra<ti da Ehrenb. and X. lyra Ehrenb. I have 

 excluded from the Bynonymysuch species as seem to me too wide of the ideal to be 

 in any way contused with it: though I recognize that there arc transitional forms in 

 nearly every instance. For this reason I do not include N. sandriana Grun., " N.fallax 

 Cleve, 6 .V. scMeinitzii Jan., c and it is with some uncertainty that I have followed 'he 

 lead of Cleve in classing the very delicate X. nebulosa Greg, with tin- above. This 

 last occurs plentifully at station 2*<»7 and \Y. Smith's type at stations 2807 and 2835. 

 Found at stations 2807, 2808, 2835, 2920H, Galapagos and Hawaiian islands and off 

 Lower ( Jalifornia. 



Navicula impressa Grun.; Schmidt. Atlas pi. 6.f. 17-18. l s 7"». Cleve, Sv. Vet. 

 Akad. Ilandl. 26-': 7,0. L894. De Toni, Syll. Alg. 2: L34. L891. Schmidt, Atlas 

 t>l. 6.f. 86 (unnamed). 1875. 

 My specimen is an unsatisfactory example of this diatom. It agrees accurately with 

 Schmidt'.- unnamed figure cited above. Though I share thedoubl of Schmidt of this 

 being identical with any known species, I think the similarity to the above is too close 

 to admit of maintaining here two good species. Lagerstedtd has given this name by 

 mistake to a variety of V. cancellata Donk. 

 Found at Btation 3712H, Okhotsk Sea. 



"Verh. Zool. Bot, Ges. Wien 13: L53. pi :../". 5. L863. 

 '-Sv. Vet. Akad. Handl. 26 : L35. pi 5.f. r. . L894. 



S< hmidt, Atlas pi. 70. f. ;.v 1881; .Ian. Diat. Gaz. Exped. /</. 15. /. i. 

 dBih. Sv. Vet. Akad. Ilandl. 3' : 33. j>l. l.f. S. L876. 



