370 CONTRIBUTIONS FROM THE NATIONAL TTKHBARIUM. 



GOMPHONEMA C. Ag. 



Gomphonfma C. Ag. Syst. Alsj. 15. 1824. Pritch. Ilisf. Infiis. cd. 4. 886. 1801. 



^W. Smith, Synop. Brit. Dial. 1: 77. pi 27-29. 1853. Ral)h. Fl. Eur. Alg. 1: 22. 



*282./. 71. 1S()4. Van Hour. Synop. 122. pi 23-25. 18SI; Tn^at. Diat. 208./. 5S. 

 1806. Do Toni, Syll. Alg. 2: 419. 1891. Brun, Diat. Alp. 33. 1S80. GrilT. & 

 Henf. Micr. Diet. od. 3. 34G. pi 12. J. ;U. 1875. Clovo, Pv. Vot. Akad. Ilaiull. 26 ': 

 178. 1894, cliar. emend. 



r 



Meridion C. Af:,^ in part; Ehvonl). Infus. 208. pJ, UL f. S. 1838. ' 



Sphaiosira VAivvnh. Tliys. Abli. Akad. Wis.s. Berl. 1841: 402. pJ. S. I. f. 27, J]\ 



/ 12. ]Si;i. rriLcli. Hist. Infus. od. 4. 892. JSfil, Kui/.. nacill. 88. pi, 29. f, 47. 



1844. 



Spkenetla Kiitz. liaoill. 8:^. ]844. 



GomphomUa Ral)h. Sussw. Diat. GI. pJ. 9.f. 1-3. 1853. 



Gomphoncis Clove, Sv. Vet. Akad. Ilandl. 26-: 73. 1894. 



The inadtH^nate ground for (vui^titutiug a genus— nauK^ly, the matter of its being 

 provided with a gelatinous attachnu^nl. or being free— diwru.ss<.'d under the g<Muis 

 Cocconema Klirt^nl)., is responsible for s(unt' of the above synonyms. Tluis Gomjjlio- 

 nella Ral>h. is the form of Gomj)honema 0. Ag. that is found in gelatinous mass(*?«, 

 while Spheni41a Kiitz. is made uj) of tlu* forms tliat nn^ froo. Ib'il)erg'' sho\7ed tliat 

 both forms occur in the same species. Clove's Gomi)lioneis is based on a fine line near 

 tlie margin and a slight difference in tln^ punctation of the costae. Cleve is consist- 

 ent, in ihat he l>if^aks up other gen(Ta, as Xavicula, on just such grounds; but, as is 

 shown under that name, the distinctions are too tii\ ial t-) separate generically forms 

 that are otherwise so nearly related. Tlie genus Rhoico.s]>henia Grun. is sometimes 

 spoken of as differing but slightly from this genus. It is much nearer to Achnanlhes 

 Bory by reason of the totally unlike valves of the frustulc. Gomphonema is closer 

 to Cocconema Ehrenb. than to any oth(;r valid genus. 



Gomphonema herculeanum Elirenb.Ber. Akad. Wiss. Berl. 1845:78. 1840; Mikrog. 

 pi. S7A.J. .9, ph S5 A, VII. J. 12-13. 1854. Van Ileur. Synop. pi. 23 J. 2, Pritch. 

 Hist. Infus. ed. 4. 890. 18G1. De Toni, SylL Alg. 2: 420. 1891. 

 GompJioncishrcHhana Clcve, Sv. Vet, Akad. Handl. 26-': 7.S. 1894. Schmidt, Atlas 

 pi 215./. 4-14. 1899; pi 2SS.f. 1-2. 1902. 



De Toni gives as reference 11. L. Smith's type no. 177. Smith labels it ''Gompho- 

 nema capitantm hcmdaneum'' (not lurcakanum). It is an unimportant variety of 

 that spe( it s and does not at all resemljlc this one. 



Found at station 309411, Okhotsk Sea. 



Gomphonema mammilla Ehrenb. Mikrog. pi 37. JLf. 10. 1854; Phys, Abb. Akad. 



Wiss. Berl. 1870: 50. 1871. Van Ileur. Synop. pi 23. J. 1. 1881. Ralfs in 



Pritrli. Hist. Infus. ed. 4. S90, |S(M. 

 Gomphonns mamilla Cleve, Sv. Vel. Ak:ul. Ilandl. 26': 73. 1S94. 

 Gomphonema omjonicuin Ehrenl). Mikrog. pi 37. If./. I! -13. 1S.54? 



Gomphonema (oreijonicnm \m\'l) vutrimvm Grun.; Van IftMu-. Synop. pi 23. f. 3. 



1S8L(?) 



I am not satisfictl of the specific i<l(^ntity of Ehr(^nb(M'g's (I mammiUa and G. orcgoni- 

 cnm. As Ralfs jxiints out, there are some consitleral4e di iT^'rences. It is, hnwevi^r, 

 doubtful if they can be held separate. I do not agree wiili De T(mi in looking upon 

 all tlie above as synonymous willi G. herculennnm Fdirenb. It should l>e here noted 

 that the figun^ of Van Ileurck is misleading in having an unsynunetrical curvature of 

 the costae on opposite sides of the nuHlian line. 



Found at station 2882, off Oregon. 



«Heib. Krit. Overs. Danske Diat. 1803. 



