MANN DIATOMS OF THE ALBATltOSS VOYAGES, 357 



pL 9. / 4- 1881; Treat. T)iat. 193. pi 26, f, 7J9. 189G. 0'M<.'am, Proc. Roy. Irish 



Acad. II. 2: 402. pi 33. f. 30 (poov). 1875. Do Toni, Syll. Alg. 2: 80. IStM. 

 Nnricida cntomon Ehrcnb. err. dot. Donk. I?rit. Diat. 49. pi 7./. 5. 1871-73. 

 Navicula didyma Ehronl). err. det. Greg. Trans. Micr. Soe. Lorul. n. s. 4: 45. plS. 



f. 10 (not/. 15), 185G. 

 Navicula (jeintiiatula Grun. err. det. Gleve, .Toiirn. Quek. Micr. Clul) II. 2: 107. pi 



12. J. 1. KS85. ' 

 Dip^oTimsT^/ra^/i^/aClcve, Sv. Vet. Akad. Ihindl. 26'': 87. 1894. 



Donkin's pla<;ing (his species nntka* N. entoiiton ]'Jirenl>. is not it) 1>*' favored, as his 

 fignre is (dearly a N. splendida. It is difhenlt Lo (h'terniin*' what A^ enlomon is, as 

 Ehronl)erg'fi figures" are not remotely ahkc^; hut eertainly they can not ho united 

 with the above species. Rahenhorst ^> erroneously inchuh^s here A^ inri/rra^a Greg., 

 an arrangement accepted 1) J" Do Toni.*-' (?leve h(jldy tlu^m separate, and also groups 

 here quite a number of species that I do not consitler synonymous. There is, how- 

 ever, one in his list,^^ nauudy N. diploslicia Grun.<^ whicli is chjse U) this species, per- 

 haps too ck>se./ A s])ecimen fntm station 3004 is unusually small and with very deli- 

 cate beading, hut built on the gimeral plan of this species. See also remarks under 

 N. omaniensis (tTeve) ihum Ehrenb. in this report. 



Found at stations 2920II, 300811, 3(i03, 3{i01, Hawaiian Islands an<I ik'ring Sea. 



Navicula spuma ^fann, sp. nov. Platk LII, figure 7. 



Valve broadly ellii>ticah tapering by even curve to the rounded, somewliat produced 

 apices; raphe perfectly straightj on either side of it a very narrow hyaline space, 

 expanded at the center into a large circular hyaliiu* area onedudf the width of the 

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

 up into a row of foamdike flakes; margin delicately headed. 



Length of valve, 0.075 mm.; width of valve, 0,0:50 mm. 



The general aspcs-t of this diatom is that ol a Mastogloia, but it entirely lacks the 

 internal marginal i)lates or septa characteristic of that genus. 



Type in the U. S. National Museum, No. 590b^)l, from station 40:^911, jioring Sea, 

 June 27, 1900; 91:? fathoms, bottom of grey sand and clay. 



Navicula subacuta (Ehrenb.) Ralfs in Pritdi. Hist. Tnf\is. ed.4. !H)S. 1861. Schmidt, 

 A\\':i?^p},i3,f,31-SS. JS7G, De Toni, Syll. Alg. 2: J92. 



Pinnularia subacuta Fjhrenh. MW^rog. pi 35 A, VI. f^ 12. 1854. 



Pinnularia major (Meve, Sv. Vet. Akad, Ilandl. 27'': 89. 1895, not Xavicula major 

 Kutz. BacilL 97. pi 4.f. 19, 21. 1844. 



Some of my specimens approach one of Schmidt's unnamed figures, fl^ and therefore 

 somewhat resemble Schmidt's figure of N. formosa Greg.,^ though this present species 

 and N. formosa are clearly distinct. Clove's union of N. subacttta with N, major 

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



Found at station 4029 II, Bering Sea. 



Navicula subcincta Schmidt, Tahresb. Komm. Deut. Mecre 2: 87. pi 2. J, 7. 1874. 

 Schmidt, Atlas pi 13. f. 41 • 1875. 

 Navicula succincia Schmidt, Atlas pi 69./, 32. 1H81. De Toni, Syll. Alg. 2: 70. 



1891 . 

 Diphmcis suhHncta Cleve, Sv. Vet. Akad. Ilandl. 26-: 8(1. 1894. 



aPhys.Al)h. Akad. \Viss.I5(Tl. 1841: plLLf.3-4^ 1843; Mikrog. y;/. 7.9./. ^^. 1854 

 b Rabh. Fl. Eur. .Vlg. 1: 204. 18G4. 



c De Toni, Syll. Alg. 2: 81. 1891. 



d Sv. Vet. Akad. TTandh 26-^: 87-88. 1894. 



e Schmidt, Atla^ pi 13. J. 25-30. 1875. 



fCL also Schmidt, Atlas pi G9.f. 22. 1881; pi 174- f. PL 1892. 



g Schmidt, Atlas pi 43 J. 29. 187G. 



h Schmidt, Atlas pi 50, J. 12. 1877. 



