MANN DIATOMS 01 MM. ALBATROSS VOYAGES. .'>■">/ 



pl.9.f. ,. L881; Treat. Diat. L93. pi L896. O'Meara, Proc. Roy. [rish 



Acad.II.2: \02.pl /. 30 \ r). 1875. De Toni, Syll. Alg. 2: 80. 1891. 



icula entomon Ehrenb. err. det. Donk. Brit. Diat. 19. pi. 7./. 5. L871 7:;. 



Navicula didyma Ehrenb. err. det. Greg. Trans. Mi< r. Soc. Lond. q. -.4: 15. pi. 5. 

 /'. t6 i not/. 15 . L856. 



Xtiiirnln gemmatula Grun. err. det. Cleve,Journ. Quek. Micr. < lub II 2: K7. />/. 

 12./ /. L88 



Diploneis splendida Cleve, Sv. Vet. Akad. Bandl. 26 2 : 87. L894. 



Donkin's placing this Bpecies undei \ entomon Ehrenb. is not to be favored, aa his 

 figure is clearly a N. splendida. It is difficull to determine whal N. entomon 

 Ehrenberg's figures are qoI remotely alike; bu1 certainly they can nol be united 

 with the above Bpecies. Rabenhorsl h erroneously includes here N. incurvata l 

 an arrangement accepted by DeToni. c Cleve holds them separate, and also groups 

 here quite a number of species thai 1 'I" nol consider synonymous. There is, how- 

 ever, one in his list,** namely .Y. diplosticta Grun.< which is close to this species, per- 

 haps t"" close. ; \ Bpecimen from station 3604 is unusually small and with very deli- 

 cate beading, but built on the general plan of this Bpecies. See also remarks under 

 .Y. omaruensis (Cleve Mann Ehrenb. in this report. 



Found at stations 2920H, 3008H, 3603, 3604, Bawaiian [slands and Bering - 

 Navicula spuma Mann, Bp. nov. Plate LI I. figi 



Valve broadly elliptical, tapering by even curve to the rounded, Bomewhat produced 

 apices; raphe perfectly Btraight, on either Bide of il a very narrow hyaline - 

 expanded at the center into a large circular hyaline area one-half the width of the 

 valve; markings a fine Bhagreen, this near the margin all around the valve broken 

 up into a row of foam-like flakes; margin delicately beaded. 



Length of valve, 0.075 mm.; width of valve, 0.030 mm. 



The general aspect of this diatom is that of a Mastogloia, but it entirely lacks the 

 interna] marginal plates or septa characteristic of that genus. 



Type in the U. S. National Museum, No. 590151, from Btation W29H, Berii _ 

 June 27, L900; 913 fathoms, bottom of grey sand and clay. 



Navicula subacuta < Ehrenb.) Ralfs in Pritch. Bist. Enfus. ed. L908. L861. Schmidt, 

 Atlas pi. 4S.f. 81-88. L876. De Toni, Syll. Alg. 2: L92. 



Pinnularia subacute Ehrenb. Mikrog. pi. 85 A, VI. f. L2. L854. 



Pinnularia major Cleve. Sv. Vet. Akad. Bandl. 27 : 89. L895, not Navicula major 

 Kutz. Bacill. 97. pi .;./. 19, 21. L844. 



S<mie of my specimens approach one of Schmidt's unnamed figures, (7 and therefore 

 aomewhal resemble Schmidt's figure of N. formosa < rreg.,* though this present 3p 

 and N. formosa are clearly distinct. Cleve's "union of N. subacuta with N. major 

 Kutz. is not wise. See under thai species in this report. 



Found at Btation 1029 B, Bering Sea. 

 Navicula subcincta Schmidt, Jahresb. Komm. Deut. Meere 2: B7. pi. .'./. 7. I s 7l. 

 Schmidt, Atlas pi IS. / 41. L875. 



Navicula succincta Schmidt. Atlas pi. • • L881. De Toni, Syll. Alg. 2: 76. 



L891. 



DipUmeis subcincta Cleve, Sv. Vet. Akad. Bandl. 26 : 86. L894. 



a Phys.Abh. Akad. Wiss.Berl. 1841: pll.I./S .. L843; Mikrog. pi. 19./. . 



b Rabh. Fl. Eur. Alg. 1: 204. L864. 



cDeToni, Syll. Alg. 2: Bl. L89I. 



d Sv. Vet. Akad. Bandl. 26-: ^7 ss. |s!M. 



t Schmidt. Atlas pi IS./. 15 SO. L875. 



/Cf. also Schmidt, Atlas pi. 69./ ... L881; pi 174./ 



g Schmidt. Atlas pi L876. 



* Schmidt, Atlas pi 50./. l :. L877, 



