.MANN DIATOMS OF THE ALBATROSS VOYAGES. 381 



Ii is probable thai the other forme m Grunow's A. marginulata al-.> belong to this 

 species. He says, regarding its relation to A', plana, "Aehnlich, aber mil breiterem, 

 Btets bis zu den Schaalenenden reichendem fast ganz glattem Mittelraume. " The 

 specimen found bj me has the characteristics of both; ii bas the practically hyaline 

 central space of Grunow's form instead "i the irregularly punctate space of Smith's 

 type, but, as in the latter, stopping shorl of the apices instead of extending to these, 

 as Grunow points out. There is, therefore, nodoubl of this variety of A marginulata 

 being the same species as Y. plana; and, as already suggested, ii might !><• well to 

 add the other varieties also. II . I.. Smith's type no. 363 is misnamed. 1 1 is a small 

 variet) of V dubia \Y. Smith as figured bj thai author and as shown in II L. Smith's 

 type n.'. 341. 



Found at station 2823, Gulf of ( 'alifornia. 

 Nitzschia punctata \Y. Smith) Grun. in Cleve & Grun. Sv. Vet. Akad. Handl. 17-: 

 us. L880. Van Heur. Synop. L71. pi >:./. : S. I vs l. Treal Diat. 384. / 125, 

 pi 15. J L896. De Toni, Syll. Alg. 2: 496 L892 nol Bail. 



bliom II" punctata W. Smith, Synop. Brit. I >ia t . 1 : 36. pi. 10. f. 76a' nol J 

 pi SO.f. 261. L853. Rabh. Fl. Eur. Alg. 1: 1 18. L864. 

 The specimens found by me have markings nearly as coarse a- those of A . g anulata 

 Grun.; fl they, however, have the decided marginal loculi on the dorsal side of the 

 valve and are clearly in all respects coarsely marked examples of A", punctata. The 

 diatom given llii- name by I.. \V. Bailey^ is A', brightwellii Kitton and has no relation 

 with ihf above. 



Found ai station 3698, off Honshu Island, Japan. 

 Nitzschia scabra Cleve in Nbrdensk. Vega Exped. 3: 180. pi a b. 1883. 



De T..ni. Syll. Alg. 2: :>:;L , . L892. 

 My specimen agrees with the above perfectly, excepl thai the puncta are se1 wider 

 apart. Ii has the peculiar "shagreen-like appearance" referred to by Cleve. Ii is 

 < > I ^: » nun. long. I <l" nol favor uniting this with A', sigma \Y. Smith, although Cleve 

 brackets thai name with a question mark. 



Found ai station 3696, off Honshu Island, Japan. 

 Nitzschia sigma Kin/.. \Y. Smith, Synop. Brit. Diat. 1: 39. pi IS. f. 108. Pritch. 

 Hist. Infus. ed. 4. 781. pi .../'. 11. L861. Rabh. Fl. Eur. Alg. 1: L56. L864 « .run. 

 J. .urn. Roy. Micr. Soc. 2: 681, L879. Brun, Dial. Alp. L05. pi 5.j i . L880. II. L. 

 Smith, Sp. Diat. Typ. no. 367. L874. Van Heur. Synop pi. 65. f. : 8, pi. • ■ 

 ! 9. 1881; Treat. Diat. 396. pi. 16. f. 581 585. L896. Cleve in Nordensk. \ 

 Exped. 3: 180, 506. L883. Lewis, Proc. Acad. Phila. 1861: 71. 1862. De Toni, 

 Syll. Alg. 2: 530. L892. 

 Synedra ? sigma Kin x. Bacill. 67. pi SO.f. /.. L844 ? 

 Amphipleura rigida Km/.. Bacill. KM. pi If.SO. L844? 

 Amphipleura sigmoidea \V. Smith, Synop. Brit. Diat. 1: 15. pi 15. f. 128. 1851 



nol A. sigmoi/Jea Nitzsch) W. Smith . 

 Nitzschia anguillula Schum. Schrift. Phys. Okon. Ges. Konigsb. 5: 53. pi. 



L867; 

 \ sigma anguillula Grun. in Schneider, Beitr. Kennt. Kauk. 119. 1878. 

 Nitzschia sigmoidea II. L. Smith, Sp. I>iat. Typ. no. 369. l s 7;. 

 Vitzschia habirshawii Feb.; II. L. Smith, Sp. Diat. Typ. no. 346. 1874. 

 \ rigma habirshawii Van Heur. Synop. pi 66. f. .. I ss l. 



\ • rigma var " valida Cleve & Grun. Bih. Sv. Vet. Akad. Handl. 5n r_\ 



pi .;./". 19. 1878. Van Heur. Synop. pi 65. f. ■ 5. L881. De Toni, Syll. Alg. 2: 

 532. L892. 



I cit. 



3t. J. mm. Nat. Hist. 7: .". I I. ., L862. 



