358 CONTRIBUTIONS PROM Mil NATIONAL HERBARIUM. 



i- probably distinct from \ l i. . though it closer) ap- 



es Don] [look upon this resemblance af much 



striking than thai between the present species and A didyma Ehrenb K 



i by Grui mow's own figures of this sp i quite different 



thing, and agrt*o more closely with 1 1 1 « - diatom I have named A ping under 



tin- for fuller discusc x ' ailing tin- V. on his 



plate, and hie figure is inexcusably bad. 



Pound at station 3008H, Hawaiian Islands. 

 Navicula undata Mann. -|>. nov. Plati I. 111. riot ai 1. 



Yah e an elongated ellipse, with blunt apices, the sides scarcel) curved until about 

 halfway between the center and the ends, thence the curvature more pronounced for 

 a ahorl distance, and 6 nail) the Bides nearly straighl to the broad and blunt apices; 

 markii roe beading of the \ asp* a type, but the beads round, not oval, 



arranged in oblique moniliform striae, the beads of which up- bo Bpaced as t" give a 

 marked wa> y appearance to the valve; raphe obscurely beaded, especially toward the 

 center, there each half Blightly bent toward the same side of the valve; ;i broad 

 median area on either Bide the raphe, extended at the center as a large stauros run- 

 ning from one Bide of the valve to the other; terminations of the raphe at the extreme 

 apices of the valve surrounded l>y large hyaline circular areas, reaching over the 

 curve of the apices to the border. 



I ■ ugth of valve, 0.080 mm; width of valve, 0.019 mm. Striae, 17 in <U>1 mm. 



This very minute but robusl diatom belongs to the A. aspera group, except for its 



beads being round and it- central hyaline band extending from "in- Bide to tin- 



other, Like the stauros of the Stauroneis type. It is in marked contrast with any 



known form, the nearest Bpecies being A. macraeana Pant.,< which differ.- greatly 



in it.- apices, its delicate beading, it- stauros, it- raphe, etc. 



Type in the U. S. National Museum, No. 590152, from station 3571H, Bering 

 July 6, L895; 696 fathoms, bottom of -icon mud and ooze. 

 Navicula vagabunda Brun; Schmidt. Alia- pi. /,' \./. 5. L892. 



Diploneis vagabunda Cleve, Sv. Vet. Akad. Handl. 26': 103. pi '../' 13, 15. 1894. 



This diatom is suggestively near that variety of N. crabro (Ehrenb. J Kutz., known 

 ,i- V pandura Breb. 



Pound at Btation 2808, Galapagos Islands. 

 Navicula vidovichii (inin. Verh. Zool. Bot. Ges. Wien 13: L50. pi. 13./. I 



l'l \n: l.l I ik.i i:i. :'». 



Navicula egyptica Grev. Trans. Micr. Soc. Lond.n.s. 14: [27.pl. It. /. 16 17. 1886. 

 Moeb. Diat-taf. pi. 75./. 16 17. L890. 



Navicula bartholomei Cleve; Schmidt, Atlas pi. 160. ./". 9. L890, not Cleve, Bin. Sv. 

 Vet. Akad. Bandl. 5 s : 6. pi. 1. ./'. 5. L878. 



ula sectilis Schmidt; Pant. Beitr. Bacill. Ung. 2: 55. pi. 8./. 152. Lfi 



The above combination represents a clear and Batisfactory specific concept. V. 

 egyptica is exactly the Bame as N. vidovichii; the variety called by Schmidt A'. 

 bartholomei Cleve variety, differs merely in being more constricted at the center of 

 the valve, and the variety called by Pantocsek N. sectilis boryana differs merely 

 in I » « i 1 1 lt Less constricted at the center of the valve. To add to these other species l< as 

 dearly relate.), though similar, as Cleve/ and De Toni 9 have done, is to lose all boun- 



Donk. Brit. Diat. pi. 7. ./'. 8b. 187] 7:;. 

 b Bih. Sv. Vet. Akad. Handl. 3"': pi. /./. .;. L876. 

 c Denkschr. Akad. Wien 48 : 56. L884 



Proc. Roy. Irish Akad. II. 2: 398. pi. S3, f.% Lfi 



Pant. Beitr. Bacill. CJng. 2: 52. pl.8./ 155. !- 

 / Sv. Vet. Akad. Handl. 26-: 63. 1894. 

 ?De Toni, Syll. Alg. 2: 171. 1891. 



