.r 1 



MAXX DIATOMS OF THE ALBATKOSS VOYAGES. 319 



slrictcHl apices, and, in ih^- zonal vi(^w, by the eostac tcMiiinating near the girdle in 

 enlarge<l or Leaded vmh. Ilis type species, D. tenuis Kiitz., well rrpresenLs the 

 eliai'ueteristicri <»f Hu^ g(uuis. 



Denticula nicobarica Grun. in Fenzl, Rei^e Novani Bot. 1: 97. pi. lA.f, 5, 1S70. 

 Von Uvuv. Synoj). pL 49. f. S. 18SL 



This minute diatom is most plentiful in the following singh^ sounding. 

 Found at station 3GI55II, Bering Sea. 



GRAMMATOPHOKA Ehrenh. 



Cramrnalophora Eliri'nb. Thys. Al)h. Akad. AViss. Borl. 1839: 112. ]52. 1841. Tritch. 

 Hist. Infus. ed. 4. 807. pi 11. J. 48-49. 52-53. ISGL Uahh. Fl. Eur. Alg. 1: 26, 

 303./. 81. iSG4. Grun. Verh. Zooh Boi. Ges. Wion 12: 413. 18G2. Van Heur. 

 Synop. 163. pi. 5S-5Shis. 1881; Treat. Diat. 353. /. 105. 1896, Be Toni, Syll. 

 Alg. 2: 750. 1892. W. Smith, Synop. ISrit. Diat. 2: 42. pi. 42. Ktitz. BacilL 

 128. pi. 17. f. 23-25. 1844. 



lymphoma Ehrenh. Mikrog. pL 35 A, II. J. 7. 1854; Phys. Abh, Akad. Wiss. Berl. 



1869: 48. pi. 2. 11. f. 18. 1870. Griff. & IL-tif. Mwv, Diet- ed. 4. 267. pi. 51. f. 



16. 1SS3. 

 Dlalomdla Grev. Ann. Mag, Xat. ITist. II. 15: 259. pi 9.f, 10-13. 1855. Pritch. 



Klst. Tnfus. <^d. 4. 810. pi 4- / 51, 52. Grun. Verh. ZooL Cot. Ges. Wion 12: 409. 



1862, Brun. Diat. Alp. 129. pi i). f. 18. 1880. 11. D. Smith, Sp. Diat. Typ. 



no. G50. 1874, Grun. in Fenzl, R* ise Xovara liol. 1: 5. 1870. Raldi. Fl. Eur. 



Alg. 1: 3, 25./. 78, 1864. Van Hour. Treat. Diat. 353. 1896. Lagers. Bih. Sv. 



Vet. Akad. Han<ll. 1^^: 20. 1873. D(^ Toni. Svll. Alg. 2: 742. 1S92. 

 Dialoiiia (DC.) Ileib. iu part; Lyng. Hydro. Dan. ISO. pi (:2A. 1819. 

 Fragilaria Lyng. in ]>art; Lyng. Hy<lro. Dan. 182. pi C>2. E F. 1819. 

 SlnaUila C. Ag. in part; Halfs, Ann. Mag. Nat. Hist. 1843. 11: 457. pi .9. /. 5. 1843. 



Tliore is great noed of a eaj)al)le mont)graph of this genus. Van Heurck's Synopsis 

 gives two plates illustrating thirty species. Smith's Ihltisli Diat^jins illustrates 

 superbly fijur speeios. Single Bjx'cios arc^ scattered here and lhcr<^ thn>ugli diatom 



literal uro. But the available figures are as a ela.ss poor and .scanty. Owing to the 

 <lrli<*at*^ markings that characterize* this genus, the (^arlicr investigators, like Lyngbye, 

 Agardhj an<l Ehrenbcrg, <'(mfused the sp(H'ies to an cxtn'mo <'xt(^nt. It is impossible 

 to look npcm Greville's g(^nus Diatomclla as anytliing more Hum a normally distinct 

 sp<('i<^s of Grammatophora. Tlu^ main mark of distinction r(4i(Hl upon for se^paration, 

 namely, the single straight septa as seen in zonal view, is neither confined to this 

 species ncpr important enough, were it peculiar to it, to form a ba.-sis fur a separate 

 genus. Thus varieties of G. undidala Flirenb.,(/. wriiai ("h^vejand G.slrlcia Ehrenb,« 

 show the same (pialily. This charactca-istic, together with the extreme minuteness 

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

 however, its gc^ieric status valid, it would nt^cessarily tak(i Ehrenl)erg's older name, 

 Disiphonia, instead of that of Greville. 



Grammatophora flexuosa Grun.; Van Ileur. Synop. pi 53bis. f. 22-23. 1881. 

 Temp. & Brun, Mem. Soc. Phys. el Hist, Nat. Gem^va 309: 71. 1889. Do Toni, 

 Syll. Alg. 2: 759. 1892. 



l^'ound at station :')0]3II, Hawaiian Islands. 



Grammatophora lyrata Grun.; Van Ii<'ur. Synop. pi. 53his. f. 21. De Toni, Syll. 

 Alg. 2: 759. 1S92. Gleve & Molb type no. 162. 



INfy specinn^n agrees with the typ(», excf^pt tliat the lyrate valves are nnich less 

 stnmgly undulated. 



I'ound at stati<m 2807, Galapagos Islands. 



«Cf. Gastr. Rep. Voy. Ghalb Bot. 2: /;/. ;j:^./ J;2. ISSG. 



