236 CONTETBUTIONS FROM THE NATIOKAL HERBAFTUM, 



"b. A^alve apparently wiUioiit raphe, this being ohseured l)y the b(^aded, 

 marginal keel; markings always traiusverae. (Nitzsciiieae). 



Nitzschia (j). 'MS). 



D. Raphe hidden in hitiTal winged keeL (Suuikelloideak.) 



a. Valve surfat^' undulated in a series of transv(*rs(^ depressions and eh^va- 



lionH SphinctocysHs (p. 882). 



b. Valve surfaee uoi undulattnl in a series uf lransvers(^ dt^pressions and (deva- 



tions. 

 a. Valve outliiu* el]ii)tieal. ovoid or rarely h>ngdaiu*eolale; marki'd wilh 

 transverse ribs not quite extending 1o the t'**n1er, thus heaving a 

 hyaline nu^lian line; valve surface^ nearly flat, rarely spirally 



twirited; krel winged Snrirella (p. 38:5). 



6. Valve outline nearly eircular; riljs oi- (jtlier markings radial: valve 

 riurfaee twaddle-shaped, rarely alnu>.st Hat; kfnd not winged. 



Cainpijlodm'tfs (p. '^80)* 



MELOSIRA C. Ag. 



klosira C. 1^, Syst, Alg. 8-9. 1824. Kutz. Bacill. 48, 52. 1844; Sp. Alg;30. 1849; 

 Linnaea 8: 70. 183:^ Ralls, Ann. Mag. Nat. Hist. 12: 34G. pL 9. 1843. Thwaites, 

 Ann. Mag. Nat. Tlist. II. 1: \(VJ , 1848, in part, W. Riuilli, Synop. Brit. Diat. 3: 

 54, 1856. Prileh. Hist. Infns. ed. 4. 815. pL .5./. 62-65, 7/. ISHl. Rabh. Fl. Eur. 

 Alg. 1: 7j 37./. S. 1864. Griff, k Henf. Mier. Diet. (^d. 4. 4W. pi. 17. f. 5-6, 15. 

 1883. Ca^tr. Rep. Voy. (Iiall. Hot. 2: 92. pL 21. f. 1-2. 188(1. Van lI(Hn'- Synop. 

 197. pi. 85-91. 1881; Treat. Diat. 438./. 1G5~1GS, pi. IS./. (108-613, pL 19. f. 



614-624^ 18f)<>. 



/■ 



laillondla Bory, Diet. Hist. Nat. 7: 101. 1825, not Bory. 1823. 

 OalUonella Ehrenb. Infns. Ififi. 1838. De Toni, Syll. Alg. 2: 1331. 1894. 

 Lysigonunn Link; Nees, TTor. Phys. Beroh 4. 1820? O'Meara, Proe. Roy. Tri:^h 



Acad. II. 2: 248. pi. 26. f. 4- 1875. De Toni, Sylh Alg. 2: t328. 1894. 

 Orthoaeira Thwaites, Ann. Mag. Nat. Hist. II. 1: 1(J7. 1S5S, in i)art. W. Snnth, 



Synop. Brit. Dial. 2: 59. 1856. 

 Aylaroseira Thwaites, Ann. Mag. Nat. TTist. II. 1: 167. 1818, in ]>art. 

 Paralla Heib. Krit. Overs. Danske Diat. 33. 1863, in pari D.' Toni, Syll. Alg. 2: 



1349. 1894. r.rnn. Denksehr. Akad, Wien 48': 93. 1884. <4eve, I^ih. Sv. Vet. 



Akad. ITandl. 1^=': 7. 1873. 



Two generic names antt*dat(^ Agardli's Melosira. The first is Lysigoniuni Link. 

 It tfeenis that his type species was one of the then indelinitely hxed algae ealh'd 

 Conferva m.oniUforwi,s\ l)ul wa^s probably not a diatom. At least Elir(>nberg si> eon- 

 tends. <* Link himself, aec^irding to Ehrenberg, abandi)Tiod the natn*' in 1824. If 

 it can be unmistakably ])r(>v(Hl to have been apjdied to a diatom of tliis rharaet*^', 

 Link*s name must noplace that of Agardh. Tlu^ scH'ond nutne is Gallionrlla (Oaillo^ 

 nella), given by Bory St. Vincent in 1823^ but withont definite outline or the 

 enumeration of any species. Two years later, 182-'), in ihc^ sann^ work Bory does 

 describe two species, G, nunnnnlokks and G, moyiiliformi^. But in th*' preceding year, 

 1824, Agardh gave the generic name Melosira to these diat(jnis and described five 

 species. This name is therefore valid, unless, as above stated, Link's Lysigtjnuuu 

 can be clearly identified with this genus. The genus has been variously divided by 

 different authors. The mn.st imintrtant attempt at division, a Iliing desirable iji 

 its(4f on account of the large nnnd>er of Hpeci(^s in the gt^nus, was ciwried out by W. 

 Smithj^ based on the analysis of Thwaites.^ Smith accepts the division of this 



^ Fdu'enb. Infns. 166. 1838. 



h\\\ Smith, Synop. Brit. Diat. 2: 54. 1856 



cAnn. Mag. Nat, Hist. II. 1: 167. 1848. 



