MANN DIATOMS OF THE ALBATROSS VOYAl 319 



Btricted apices, and, in the zonal view, by the coetae terminating near the girdle in 

 enlarged or beaded ends, lie type specie* D. tenui Kui/... well represents the 

 characterisl ice of the genus. 



Denticula nicobarica Grun. in Fenzl, Reise No L: 97.pl. 1A. /. 5, l v 7»>. 



Van II. ■nr. Synop. pi. \9.f ■ 1881 



This minute diatom i- most plentiful in the following single sounding. 



Found al station 3635H, Bering Sea. 



GRAMMATOPHORA Ehrenb. 



G ammatophora Ehrenb. Phys. Abh. Akad. Wiss. Berl.1839: L12, L52. L841. Pritch. 

 Bist. Enfus. ed. I. 807. pi. 11. J L861. Rabh. I-'l. Eur. Alg. 1: 



303 . ./'. 81. L864. Grun. Verh. Zool. Bot. Gee Wien 12: 113. 1862. Van Heur. 

 Synop. L63. pi. 5$ 5Sbis. L881; Treat. Diat. 353./ 105. L896. De Toni, Syll. 

 Alg. 2: 750. L892. \\ . Smith, Synop. Brit. Diat. 2: 42. pi. 42. Kiitz. Bacill. 

 L28. pi. 17. / 28 25. L844. 

 Disiphonia Ehrenb. Mikrog. pi. S5A. II. j. 7. L854.; Phys. Abh. Akad. Wiss. Berl. 

 1869: 48. pi. 2. II. f. 18. L870. Griff. & Benf. Micr. Diet. ed. 4. 267. pi. 51. f. 

 16. 1883. 

 Diat&mella Grev. Ann. Mag. Nat. Bist. II. 15: 2.")!). pi. :>./. 10 IS. L855. Pritch. 

 Bist. Cnfus. -l. -i. 810. pi ;. / 51, 52. Grun. Verh. Zool. Bot. Ges. Wien 12: 

 L862. Brun. Dial. Alp. L29. pi L880. II. D. Smith, Sp. Diat. Typ. 



no. 650. L874. Grun. in Eenzl, Reise Novara Bot. 1: 5. L870. Rabh. Fl. Eur. 

 A.lg. 1: ::. 25./. 78. L864. Van II. ur. Treat. Dial. 353. L896. Lagers. Bib 

 Vet. Akad. Bandl. I 14 : 20. L873. De Toni, Syll.Alg.2: 742. . - 

 Diatvma DC. Beib. in pan: Lyng. Bydro. Dan. L8i I. L819. 



Fragilaria Lyng. in part; Lyng. Bydro. Dan. L82. pi. 62. E F. L819. 

 StriatellaC. Ag. in pan: Ralfs, Ann. Mag. Nat. Bist. L843. 11: 157. pi. 9. / 5. 1843. 

 There is great need of a capable monograph of this genus. Van Beurck'a Synopsis 

 gives two plates illustrating ihiny species. Smith's British Diatoms illustrates 

 Buperbly four species. Single species are scattered- here and there through diatom 

 literature. But tin- available figures are as a class poor and scanty. Owing to the 

 delicate markings thai characterize this genus, the earlier investigators, like Lyngbye, 

 Agardh, and Ehrenberg, confused the species to an extreme extent. It i- impossible 

 to look upon Greville's genus Diatomella as anything more than a normally distincl 

 species of Grammatophora. The main mark of distinction relied upon for separation, 

 namely. the»single straight septa a- seen in zonal view, is neither confined to this 

 species nor important enough, were#it peculiar to it. to form a basis for ;i separate 

 genus. Thus variel ies of G. u mhihihi Ehrenb., G. a ctica < Jleve, and G. stricta Ehrenb. a 

 show the same quality. This characteristic, together with the extreme minuteness 

 and delicacy of this form, mark it as a sharply distinct Bpecies, nothing more. Were, 

 however, it- generic Btatus valid, it would necessarily take Ehrenberg's older name, 

 Disiphonia, instead of thai of < rreville. 



Grammatophora flexuosa Grun.; Van Beur. Synop. pi. L881. 



Temp. & Brun, Mem. Soc. Phys. el Ili-t. Nat. Geneva 309: 71. L889. De Toni, 

 Syll Alg. 2: 759. L892. 

 Found at Btation 3013H, Bawaiian Islands. 

 Grammatophora lyrata < iru n. : Van Heur. Synop. pi. 58bis. f. \^<- Toni, Syll. 



Alg. 2: 759. L892. Cleve ,v Moll, type Q0 . L62. 

 My specimen agrees with the type, excepl that the lyrate valves are much less 

 strongly undulated. 

 Found at station 2807, Galapagos Islands. 



oCf. Castr. Rep. Voy. Chall, Bot. 2: pi 29. / / '. 18 



