M\NN DIATOMS OF I'll I. ALBATROSS VOYAGES. 293 



v .. r \ evidenl radial arrangemenl of the network, and, on the other hand, there is no 

 mention by him of the apical Bpines. li is probable all th< Be are alike, in which i ase 

 the name should be Trigonium reticulo-radiatum. li may be added thai m\ 

 imens are larger than the Grove and Sturl type, which i 0.0022 U) 0.004 inch, 



approximately equal to 0.0056 to 0.01 nun., while tnj specimens vary from I 

 0.16 nun. 



Found at Btation 1029H, Bering Sea. 



Trigonium parallelum Ehrenb.)? Mann. 

 Amphitetras parallela Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1839: 143. 1841?; 

 Mikrog. pi 19. f. Wa b. L854.? Kiitz. Bacill. L35. L844. Pritch. Hist. Infus. ed. 

 I 858. L844. De Toni, Syll. Alg. 2: 908. L894. 



m parallelum Ehrenb.?; Grev. Trans. Micr. Soc. Lond. n. b. 13: 104. pi. 9. 

 /'. .; . ,. L865. Moeb. Diat.-taf. pi. i S. L890. Schmidt, Atlas pi 



.. // /.;. SO, pi - nol /. 18)',pl81.f. l >. L885. Van Heur. 



Synop. pi 111. f. : 6 (no1 /. /. S 5 . L881. Grun. in Fenzl, Reise Novara Bot. 

 l": 24. Into. 

 / .. atium obtusum Ehrenb. Ber. Akad. Wiss. Berl. 1844: M 'hys. Abh. 



Akad. Wiss. Berl. 1841: 425. L843; Mikrog. pi L854. Pritch. 



Hist. [nfus. ed. 4. 857. L861. 

 Nothoceratium? parallelum De Toni, Syll. Alg. 2: 915. L894. 



I have adopted the above specific name, as my specimen agrees with Greville's form. 

 Whetherornol this is .1. parallelum Ehrenb. is impossible to determine. Ehrenberg 

 simply says, a under .1. antedilm iana, " Vor wenig Tagen hat Bich in den griechischen 

 Kreidemergeln noch eine zweite Arl dieser Gattung gefunden, welche auf den Seiten- 

 flachen parallela ReihenvonZellen hat unddieals A. paralU foabzusondern i.-t ." Kiit- 

 zing simply repeats this meager mention. Ehrenberg' s figures are alsoinconclusive but 

 show a very differenl center. All this would be simply negative excepl for the charac- 

 ter of T. obtusum, which unmistakably is the same a- Greville's '/'. parallelum, the 

 figures of Ehrenberg, togetherwith the diagnosis, making this plain. Hethen 

 " * * * angulis late rotundatis, sub tilissime punctata. " [f, therefore, Ehrenberg 

 ha.- twice named the same species, i In- earlier name. j><inilit!<i. holds; if not, the proper 

 name for Greville's form and my own is obtusum. Though the chances are in favor of 

 the latter view, they are nol conclusive, and the better-known name should remain. 



li is nol impossible \<> consider this species as belonging t<> Stictodiscus, ae 

 tracane h suggests. Bui at leasl the form with which [ have to deal is a little too diver- 

 gent to assign to that genus. I think the resemblance to Stictodiscus is largely in the 

 anastomosing shadow Lines at the center of the valve, an appearance lacking in my 

 specimens. !»•■ Toni's placing the quadrate form in Amphitetras ami the sextate in 

 Nothoceratium i- of course indefensible. 



A tew Pad errors in naming figures Bhould here be mentioned. Schmidt's Atlas, 

 plate 76, figure 18, is nol '/'. parallelum, hut . as< rrunow insists, /'. iuncatenst Grun. Van 

 Heurck'e Synopis, plate 111, figure 1, has nothing to do with this form; those in Wolle i " 

 are bo had as t" have no resemblance t" this Bpecies and his figures I I. \- are poor 

 copies of Schmidt - - plate 75, figures 11. 12, themselves doubtful examples of this 

 Bpecies. Van Heurck's plate 111, figures 3 certainl) . 1,5 probably), are 2 

 anum Norm. Stictodiscus •.'' 



Found at station 3013H, near Hawaiian Islands. 



Phys. Abh. Akad. Wiss. Berl. 1839: 143. 1841. 

 i' Castr. Rep Voy. ('hall. Bot. 2: III. 1886. 

 - Wolle, Diat. \ \. />/. 100. 1890. 

 da. Schmidt. Atlas pi 75. f. 15. 1882. 



