318 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 



BvtiJana szakalensis Pant. Beitr. P>acill. Ung. 2: 70. pL ??./. 355, 1889. Dc Toni, 

 Syll. Alg. 2: 1023. 1894. 



nuUlarki Irrnerii rant. BeiLr. llai-ilL Ujig. 3: pZ. JJ./. -}7-^ 1893. De Tuiii, Syll. 

 Alg. 2: J024. 1894. 



Ridilaria capkaia Temp. & Brim, Meui. Sor. Pliys. ct Hist. Xat. ricncva 31': 54. 



pi l.f.3a~h. 1891. Do Toni, Syll. Alg, 2: 1022. 1894. Pant. Boitr. l^acill. 



Ung. 3: ;??. ^^./. -r^. 1893. 

 Ruiilana radiata G'r. ^^ St. Journ. Qiiok. ilicr. Clul) IL 2: 322. p/. 7,9. /. ^-5, 



188G. 



Tvuiilana cdcntula Castr. Kep. Voy. riuill. Bot. 2: 92. pi. 18. f, 14. 188G. 

 Rulllaria ohcsum Gvl^-v.] Olevr. Bill. Sv. V<4. Akad. Kandl. 18'': J9. 1881?. 

 Ruiilana s if pcrha Grev. Trans. Mirr. So(\ Tond. n. s. 14: 125. ph 11. f. 11-12. 1800. 



Moel>. Diat.-taf. pi 74. f. 11-12. 1890. De Toni, Syll. Alg. 2: 1022. 1894*^ 

 Ruiilana elliptica Grov. Quart. Jdurn. ^Vwv. Sci, n. s. 3: 220. pi 9. f. 3. 1803. 



^hH^]y, Diat,-taf. pi 47. f. 3, pi 74- f. '^ 10. 1890. Trans. Mirr. Soc. Lend, n, s. 



14: 125. pJ. JLf, 9-10. 1800. Dc Tuni, Syll. Alg. 2: 1022. 1894? 

 R}fiUaria rentricosa Grev. (^lart. Journ. :Micr, Sri. n. s. 3: 228. pl9.f.2. 1803. 



Pant. Beitr. Baeill. Ung. 1: 44. />Z. 9.f. 78. ISSG. Moel). Diat.-taf. pi 47, f, 2, 



1890. De Toni, Syll. Alg. 2: 1022. 1894? 



This f^jH'c 10^:5 irisul)je('t to great variation. A good gathering will slu)\v nearly all the 

 forms repi'esented Ly the above names, together with intergradations, R. rmlfata, 

 if judged from the figure alone, would bcem (piite distinct, but interpreting tlie lines 

 as rows of beads, as wo learn from tlu^ diagnosis that they ar(% we see that we luiv<^ to do 

 with an unimportant variety of th<! alK)ve. It is pra<4ieally identical with R. edentvia 

 Castr. There is some doubt as to the worth of the last tliroe names wilh the authority 

 of Gn^ville, but a comparison of tlie forms r(^prosented b}' these wilh all the above 

 will indicate that they are probably varieties. I have followed tho mimes wilh a 

 question mark. The doubt over R. obesum is due to the lack of a figure. So fur as 

 can be made out it belongs here. 



Found at Station 4029II, Biding Sea. 



DENTICULA Klitz. 



Dentinda Klitz. Baeill. 43. (not pi If. GOa-b). 1844. Ghar. emend. Grun.Vt^rh. Zool. 

 Bot. Ges. \Vi(^n 12: 540. 1802. Pritc^i. Hist. Infus. ed. 4. 773. ]>l 13, f. 4, 

 1801. Van Hour. Synop. 159. pi 49, f. 1-38. ISSL Rabh. Fl. Fur. Alg. 1: 12, 

 114./ 30. 1SG4. -De Toni, Syll. Alg. 2: 557. 1892. AV. Smith, Synop. Brit. Diat. 

 2: 19. pi 34. /. ^92-295. 1S5G. Griff, k Henf. Mier. Diet, ed. 3. 230. pi 12. f, 

 25, 1875. Brun, Diat. Alp. 112. pl3, f, 34, 36-37. 1880 (not Trans. Roy. Soc. Fdinb. 

 21: 495. pi 10. f. 34-36, 38-39 (except/. 37). 1857; Verb. Zool. Bot. Ges. \\i(^n 12; 

 548. pi 12, f. 15. 1802). 



Eunotia Fhrenb. Mikrog. pi 34. V. 11 f, 7-8. 1854, in part. 



Odontidium Kiitz. in part; O'Meara, Proc. Roy. Irish Acad. II. 2; 288. 1875. 



The genus as originally defined by Kiitzing is very indefinitely bounded and con- 

 tains members of several other genera. GrunoAv's emendation is also quite faulty, 

 ^s lie lost sight of the true transverse character of tho strong costae and thereby oj)ened 

 the way for costae on only one side of thr ^al ve; in other words, short and broad forms 

 of Nitzschia. The genus is well mark<Hl by Van Ileurck,^ and the illustrations, which 

 include all the figures of plate 49, are con:^istent and decisive. Its nearest relative is 

 Diatoma (DO.) llovh,^ from which it is easily distinguished by the absence of an 

 evident hyaline median line on tlu^ valves ('^pseudoraphe"), l)y its rounded, uncon- 



« Van Ileur. Syno]>. 159. 1885. 



