MANN DIATOMS OF THE ALBATROSS VOYAGES. -w ( .) 



Grunow, bul od too unimportanl distinctions. The rather Bharp constriction of the 

 valves al the center on the dorsal aide, and especially the heavier beading of the dorsal 

 margin, sometimes extending as ridges pari waj across the valve, are the marks of dis- 

 tinction. The apices are Liable to be slightly curved \ <'nt rail) . These chanu 

 Bantzschia singly or together are more or less to b< 9( en in other Bpecies of Nil 



and are nol L r I generic marks. Van Beurck retains the genus. It i- instructive on 



t h i> point i" compare Nitzschia bilobata W.Smith with Hantzschia amphioxys Rhrenb. 

 <imn." 



Nitzschia amphibia (.in ii. Verh. Zool.-Bot. Ges. Wien 12: 574. pi. 12. f. ;.;. 1862. 

 Cleve, Sv. Vet. Akad. Bandl. 17 : 98 1880. Van Beur. Synop. 184. pi 

 f. 15 17. L881 85. Rabh. Fl. Etir. Alg. 1: 157. L864. II. I.. Smith, Sp. Dial. 

 Typ. no. 688. L874. De Toni, Syll. Alg.2: 543. L891. 

 BacUlaria frauenfeldii Grun. Verh. Zool. Bot. Ges. Wien 10: 584. pi 12. f. /. L862. 



De Toni, Syll. Alg. 2: 545. L891. 

 Nitzschia frauenfeldii Grun. in Cleve & Grun. Sv. Vet. Akad. Eandl. 17 : 98. L880. 



Van Beur. Synop. pi. 68. f. 18. L881. 

 Nitzschia actiuscula Grun. ; Van Beur. Synop. pi. 68. f. 19 28. I ss l. 

 Although the original figures of B.fram nfeldii are much more tapering than th 

 .V. amphibia, a comparison of the 1 wo a- figured by Van Beurck will show their identity. 

 In fact, Grunow says: 6 "Nahe verwandl mil A', amphibia und wohl nur eine langere 

 Form derselben." The Bpecies is also too close i" some other forms, a- N. fossilis 

 Grun.c and N. liebetruthii Rabh.d The former differs merely in much greater attenu- 

 ation, bul as I have nol seen the diatom 1 do n<>t include it with tin- above. 

 Found at Btation :'><mh . off < Oregon. 



Nitzschia angustata (W. Smith) Grun. in Cleve A; Grun. Sv. Vet. Akad. Bandl. 17-: 

 70. L880. Van Beur. Synop. L72. pl.57.f. :: :.. L881. Cleve & Moll. typ. 

 no. r>i L55. De Toni, Syll. Alg. 2: 500. Van Beur. Treat. Dun. 385. pi. 15. 

 /. 498. IS96. 

 TryblionellaangtLstataW. Smith, Synop. Brit. Diat. 1: 36. pi. 30./. 262. L853. Rabh. 

 Fl. Eur. Alg. 1: L48. L864. Pritch. Bist. Enfus. ed. 4. 792. L861. Brun, Diat. 

 Alp. L03. pi. -;./. 28. 1S80. 

 Nitzschia marina Grun. in Cleve & (.inn. Sv. Vet. Akad. Han. 11. 17-: 70. L880. Van 

 11. nr. Synop. pi 57. f. 26 27. L881. De Toni, Syll. Alg. 2: 500. L891. Cleve in 

 Nordensk. Vega Exped. 3: :><>:. L883. Wolle, Dial. X. A. pi 

 1892. 

 Both Brun and Babirshaw add i<> tli«- above li-t Trybliom lla acuminata \\ . Smith.* 

 This i- incorrect. Nor can Babirshaw's union of Synedra praemorsa Ehrenb./ be 

 admitted. The measurements of N. marina vary considerably in tin- firsl and fourth 

 citations above, the latter being much larger. 



Found at stations lMil".). 4516H, off southern < !alifornia and in Gulf of California. 

 Nitzschia insignis Greg. Trans. Micr. Soc. Lond. n. b. 5: 80. pi 1. l s ">7. 



Van Beur. Synop. />!. ';/./. /. L881; Treat. Diat. 391. pi 82. f. t 

 Cleve & Grun. Sv. Vet. Akad. Handl. 17-': 83. L880. DeToni, Syll. Alg.2: 521. 

 L892 (nol B. 1.. Smith, Sp. Diat. Typ. no. 349. 1874 V. scalaris Ehrenb. W. 

 Smith 

 Pritchardia insignis Rabh. Fl. Eur. Alg. 1: L63. L864. 



"Van Beur. Treat. Diat. pi. 15. f. [84b, 518. 18 

 &Sv. Vet. Akad. Bandl. 17-: 99. L880. 

 ■ Van Beur. Synop. pi. 68. f. 24. \^\. 

 (/ Van Beur. Synop. pi 68. f. 25 26. 1881. 

 ' W. Smith, Synop. Brit. Diat. 1: 36. pi 10. f. 77. 18 

 Phys. A1.1l Akad. Wiss. Berl. 1841: pi VI L843. 



