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MANX — DIATOMS OF THE ALBATROSS VOYAGES. 345 



The name hure givrii refers to its reaetiiblaiUM- in outline and convexity to the water- 

 beetle, Gyrinida. 



Type in tlie U. S. National :\Iiisenm, No. 590W(i, from station 2807, Galapagos Islands, 

 A])ril 4, 1888; 812 faliioms, bottom of Globigerina, ooze and coral iiuul. 



Navicula hennedyi W. Smith, Synop. lirit. Diat. 2: !):5. 1853. Greg. Trans. Mier. Soc. 

 Lojid. 11. s. 4: 40. pi. S.f. 3. 1850. Gnin. Verb. Zool. Bot,. Ges. Wien 10; 532. 

 fl. l.f. 21-22. \m). Donk. Uril. Diat. ^\. pi. 2.f. .1 1871-73. Schmidt, Jahresb. 

 Komm. Dent. Meere 2: 81). pi. 1. J. 4I. 1874. Schmidt, Atlas pi. 3. f. S-5. 17, 18. 



1875; pi. 129. f. 10. 1888. 



204. pl.4.f. 160, pi. 27. f. 755. 189G. 



/• 



Jan. Diat. Gaz. Exped. pi 15. f. 1.',. Pritch. 



Hist. Infus. ed. 4. 898. pi. 7./. G<J. 18()1. Witt, Verh. Ku.ss, Min. Ges. II. 2: 29. pi. 



9. f. 5. 188(5. O'Meara, Proc. Roy. Irish Acad. 11. 2: 387. pi. 32. f. 241. 1875. 



Pabb. Fl. Eur. Alg. 1: 178. 1804. Lcud.-Fort. Mem. Soc. Emul. St. Brie-uc 29. 



pi. 8. f. 88. 1879 (?). Pant. Beitr. BaciU. Ung. 2: 47. pi. 12. f. 207. 1889. 



Cleve, Sv. Vet.' Akad. Handl. 18'': 7, pi. l.f. 14-15 (not pi. 2. J. 19). 1881; 



27^: 57. 1895; 26^: pi. 4.f. U. 1894. De Toni, Syll. Alg. 2: 103. 1891. Petit' 



Fonds de la Mer 3: 182. pi. 4. J. IS. 1877 (?). 

 Navicula m'btdosa Greg. Trans. Roy. Soc. Edinl). 21: 480. pi O.f. 8. 1857. Donk. 



Brit. Diat. 11. pi. 2.f. 2. 1871-73. Schmidt, Atlas pi. S.f. 14. 1875; pi. 70. f 

 ^^.1881. Cf. Van Hcur. Treat. Diat. 204. p?. f 7./. 755. 1896. 

 Naricida califoniica Grev. Ediidj. New Phil. Journ. n. s. 10: 29. pi. 4. f. 5. 1859. 



Gruri.; Schmidt, Atlas />L S.f. 6, 1'.). 1875. 

 Navicula pvlystlda Grev. err. di^. Schmidt, Atlas pi. S. f. 26-28. 1875. Schmidt, 



Jahresb. Konnn. Deal. Meere 2: 89. pi. 1. f. .Jti^ 42. 1874. Cf. Edinb. New PhiL 



Jonrn. 10: 28. pi. 4.f. 2. 1859. 

 Navicula hacillifcra Pant. Beitr. Hacill. Ung. 2: 42. pi. S.f. SO. 1889. 

 Navicula {hennedyi var. ?) caliginni^u Cleve. & Grove, Le Diatomlste 1: G7 pi 10 

 f 9. 1891. 



Navicula pcrenni.s Pant. Beitr. Hacill. Fng. 3: pi. 4l.f 560. 1893. 



Tliis widely distributed diatom is mi»st variable and grades off so gra<lually into forms 

 so different from the type tliat it is out of the question to draw a boundary line around 

 this sjjecies. It merges into N. prudexta Ehrenb. and N. lyra Ehrenb. I have 

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

 in any way confused with it; though I recognize that there are transitional forms in 

 nearly every instance. For this n>ason 1 do not include N. sandriana Grun.,a JV.fallax 

 Cleve,& N. schleinHzii Jan./ and it is with some uncertainty that 1 have followed (lie 

 lead of Cleve in classing the very delicate A^. ncbnlosa Greg, with the above. This 

 last occurs plentifully at station 2807 and W. Smith's type at stations 2807 and 2835. 



Found at stations 2807, 2808, 2835, 292011, Galapagos and Hawaiian islands and off 

 Lower California. 



Navicula impressa Grun.; Schmidt, Atlas pi. (S.f. 17-18. 1875. Cleve, Sv. Vet. 

 Akad. Handl. 26^': 50, 1894. De Toni, Syll. Alg. 2: 134. 1891. Schmidt, Atlas 

 pi. (>.f. 86 (unnamed). 1875. 



'^\y specimen is an unsatisfactory example o{ this diatom. It agrees accurately with 

 Schmidt's unnamed figure cited above. Though 1 share the doubt 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 station 3712II, Okhotsk Sea. 



a Verh,' Zool. Bot. Ges. Wien 13: 153. pi. 4.f 5. 18G3. 



&Sv. Vet. Akad. Ilandl. 26'-; 1.35. pi. S.f. 27. 1894. 



c Schmidt, Atlas pi. 70. f. 48. 1881; ,Jan. Diat. Gaz. Exped. pi. 15. f. 1. 



dBih. Sv, Vet. Akad. Ilandl. 3''^: 33. pi. l.f. 3. 187(5. 



