;>.>'J CONTRIBUTIONS PROM rill NATIONAL HERBARIUM. 



stauron ae ;i Bubgeneric distinction. \- Buch it is to be commended, though I think 

 < leve i- here inconsistent, a- Pleuroetaurum original Bpelling u .1- different from 

 hi- Stauroneis a- ii i- from N.»\ icula. 



.n.l at station 3635B I'- 1 

 Navicula | 1 Ehrenb. Ber \ka-l. Wiss. Berl. 1840: I'll. L841. Greg. Tnn* 



I: . - Edinb 21: 181. pi /../'. //. L857. Km/. Bacill 98. L844. Donk. 

 Brit. Diat. 10. pi. .'./. 1. 1^71 73 0' Meant Proc Roj Irish ^ cad. II. 2: 

 pi 1875. Schmidt, Atlas pi L875; pi 129 .J ! 8 L888 Van 



Heur. Synop. 92. pi. 9.f. 13. L881 85; Treat. Diat. 204. pi. 4./. 159. 1896. Rabh. 

 I'l. lair Alg 1: 183. 1864. Pritch. Hist. Infus. ed. 1.898. L861. Witt, Verh. 

 Russ. Min. Ges. II. 22: n;.*». pi 9 f 1886. Pant. Beitr. Bacill. Ung. 1: 30. pi. 

 ■ 1886. Truan, Anal. Soc Espan. Hist. Nat. 13: \A. pi & L884. 



Cleve, S> Vet. Akad. Han. II. 27: 55. 1895. De Toni, Syll. Alg. 2: L02. L891. 

 Wolle, Diat. N. A. pi :<>./. 1. : (nol pi tll.f. 3 . 1890. Truan A Witt, Diat. 

 llayii 17. pi ../ 8. L88£ 



attexta Ehrenb. Mikrog. pi. 19. f. 18. 1854. 

 rula lunyacsehii Pant. Beitr. Bacill. Ung. 1: 28. />/. 14./. 122. i- 

 NavicuXa haytiana Truan & Witt. Diat. HaytinZ. . ./. 9. L888 



lo-radiata Temp. & Brun, Mem. Soc. Phys. el Hist. Nat. Geneva 30': 

 n. pl.5.f. .. L889. Schmidt, Atlas pi. 1 04.f. 18. ls«»7. Cleve, Sv. Vet. Akad. 

 1 Ian. 11. 27 : 55. 1895. 

 1 1 is somewhat of a stretch to include here the above-named synonym 1 >f Pantocsek's; 

 l»iii the very Buggestive figure cited above by Truan A: Win is s<> evident a comment 

 <>n the validity of Pantocsek's Bpecies that I follow Cleve in joining them. I think 

 that with almost equal reason another figure <>n tin- Bame plate, a called A'. n> up 

 Pant., coiil. 1 be classed here. DeToni* and Cleve c include A', haytiana, as above. 

 Three reasons are given by tie- authors for holding it separate from A', praetexta. The 

 best answer to these is found in comparing their own figures of the 1 wo Bpecies on plate 

 1. figures s to !i. This particular form, haytiana, is found at station l'so: in company 

 with th«- true type. 



Pound at stations 2807, 2920H, Galapagos and Hawaiian islands. 

 Navicula prodiga Mann. sj». nov. Plate LIU, FIGURE I. 



Valve outline of i; perfectly straighl lines forming an elongated hexagon, the apices 

 alone being rounded; the two median Bides Bhorter than those running to tin- apices; 

 mark in-- of moniliforaa striae arranged in the general lyrate pattern, the striae of targe 

 rounded beads, the actually median striae alone being transverse, those on either side 

 ..f the middle curving and becoming concentric to the two apices; interspaces between 

 the Btriae one-half the width of a head: lyrate hyaline area narrow, its ends not 

 approaching, hence the headed rows on each side of the raphe of nearly equal width 

 from .enter to apices; marginal Btriae at the middle of the valve fully two-fifths it- 

 width, thence diminishing toward the apices as the Bides approach; valve Burface just 

 within the margin all around depressed, whereas the margin itself is slightly elevated 

 above the resl of the surface, thus producing the appearance of a border. 



Length of valve, 0.150 mm.; width of \al\ e, 0.085 mm.; striae, is in 0. 1 nun. 

 Tin- hexagonal form called A h* nm dyi cuneata Schmidt d resembles my Bpecies only 

 in its hexagonal outline. A far nearer form In Janisch'e Diatoms of the Gazelle Expe- 

 dition, plate I"), figure '-':'>. is named .V. lyra <Ilii>hr<i Schmidt by Cleve,< where u i< 

 joined with figures in Van Heurck'e Synopsis, plate 10. figure 2, Schmidt- Nordsee 



a Pant. Beitr. Bacill. Ung. 1: />/. /;../'. 123. L8€ 



/'De Toni. Syll. Alg. 2: Hi: 1 .. L891. 

 < Sv. Vet. Akad. fL.n.ll. 27 : .V.. 

 '/Schmidt. Alia- pi .;../'. ;. IS 

 • Sv. Vet. Akad. Ilandl. 27 : 63. L895. 



