:-^- 



MANN— DIATOMS OF THE ALBATROSS VOYAGES. 



371 



COCCONEMA Hemp. & Ehrenb, 



Cocco7iema Hemp. & Ehrenb. in Ehrcnb. Symb. Pliy.s. Evertcbr. 9. })L -^^ li-f- ^0. 

 1828. EhTorib. Thys. Abb. Akad. Wi^s. BltI. 1829; 15. 1830; Infus.22;i. pLl9. 

 f. 7. 1838; Mikrug. pi 10, I. / IS. 1854. KuLz. Bacill. 80. pi (L / /. 18-11. Pritdi. 

 Hist. Infus. cd. 3. 877. pi JO.f. W4-108. ISGl. Hush. Hist. Brit. Alg. 1: 425. pi 

 101. f. 1. 1845. Schmidt, Alias pi UK J. 1-45. 1875. W. Smith, Synup. Ibit. 

 Diat. 1: 75. pi ZS.j. nO. 1853. Griin. Dcnkschr. Akad. Wii^n 48-: \)1 . pi t.J. S. 

 1884. Griff. & Ilenf, Micr. Dirt. .hL 3. 180. pi 1!./, JO-JO, 1875. 11. L. Sndfli^ 

 Sp. Diat. Typ. no. 80-85. 1874. \\*()lle, Diat. X. A. pi G.f, 1-5. 8-9, II, U- 1890 



Bacillaria Gmeb in part; Hemp. & Khrcnb. in Ehrc^nb. Symb. Thys. pi 



^■? 



/■ 



1828. 



Cymhella C. Ag. Consp. 1. 1830. Kulz. Bacill. 79. pi. 6. f. 11. 1844. Kabh. Fl. 

 Eur. Alg. 1: 10, 77./. 20. 1864. Bnin. Diat. Alp. 55. pi. 3.f. 1-8, 10-19. 1880. Van 



/ 



Truan, Anal. Snr. Espan. Hist. Nat. 13: 



33G. pi 7 J. 5-12. 1884. \V. Smith, Synop. Brit. Dial. 2: 81. 1850. Pritch. Hist. 

 Infiis. ed. 4. 875. pi 7./. 45-46. 18G1. H. L. Smith, Sp. Diat. Typ. no. 115-123. 

 1874. H. L. Smith, The Lens 1: 7(J. 1872. Greg. Qnart. Journ. Micr. Sci. 3: 

 4. pi Lf. 17-21. 185G. De Tuni, Syll. Alg. 2: 319. 18!lL W.dle, Diat. N. A. pi 7. 

 /. 1-S5. 1890. Cleve, Sv. Vet. Akad. llandl. 26^: 15G. 1894. Heib. Krit. Overs. 



Danske Diat. 107. 18G3. 

 Gomphonema Ag., in part; C. Ag. (onsp. 33. 1830. Kiitz. Linnaea 8: 5GI. pi 4> 



f. 52. 1833. 

 Frusltdia Ag. in part; Kiitz. Linnaea 8: /. HJ. 1833. Menegh. in Kutz. Sp. Alg, 59. 



1849. 



Encyonana Klitz. Linnaea 8: 589./. 7.J. 1833. Ilabh. FL Eur. Alg. 1: 11,85./. 2S, 

 1SG4. Van Hear. Synop. 65. pi 3 J. 9-23. 1881. Kiitz. r.aciU. 82. pi 22, f, 1. 

 1844. Pritch. Hist. Infns. ed. 4. 879. pi 7./. .;,9, pi Hj- 22. 18GL W. Smith, 

 Svnop.Brit.Diat.2: 67. pl54.f. -45, 185G. ^Sehmidl, Atlas ;}?. ;(^./. ^^J-6Y;. 1875. 

 Ilass- Hist,-Brit. Alg. 2: 439. pi 100 J. 10. 1815. DeToni, Syll Alg- 2: 371. 1891. 



Spiajdia Ehvi^nh. Phys. Abh. Akad. Wiss. Perl. 1835: 174.1837; Infu.<. 233. pi 20. 



/. 11. 1838. Kutz, Bacill. 81. pi 22. f. 2. 1844. Priteh. Hist. Infus. ed. 4. 879. pi 



7./. 53, pi 10 J. 206. 18G1. Rabh. EL Eur. Alg. 1: 11, 97./. 24. 18G4. Griff. & 



Henf. Micr. Diet. ed. 3. 759. pi 14- J- 14. 1875. De Toni, SylL Alg. 2: 375. 1891. 



Navkula Bovy, in part; Ehrenb. Infus. 184. pi 13. f. IS, 1838. 



Cymbophora Breb. in part; Breb. & God. Consid. Diat. 14. 1838 (cf. Van Heur. 

 Synop. pi S.f. 19, 1881). 



Pinnularia Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 133, in part; Mikrog. 



pi 5. II. f, lU 1854. 



The claim of Heiberg " that Cocconema and (.'ymbella should be united ia quite 

 generally conceded. They differ solely in that IIh^ former grows attached to a gelat- 

 inous stipe. This is, of course, as truly a morphological characteristics as anything 

 connected with the sihceous frustule. But to admit sue h a distinction is impossible 

 in this group of plants. Even in living fnrms Coceon(MTia is c(n4ain to become detached 

 in large masses from the stipes; and when found in that condition, it is manifestly 

 absurd to attempt a distinction. In fossil forms all question of gelatinous connections 

 must plainly be eliminated. In the same way dialums are Schizoneina C. Ag. whiU' in 

 their gelatinous tubes, but clearly Xavicula Bury when set free; and Euni>tia Ehrenb. 

 is identical with Ilimantidium Ehrenl). when tlie latter is out uf its gelatinous invest- 

 ment. But in the selection of ageneric namolluibi^rg, for utterly trivial reasons, passed 

 over the older name Cocconema and chose Cymbella, and liis selection has been gen- 

 erally followed. The older name is, therefore, here restored and Cymbella made its 

 synonym. In the case of Encyonema Klitz., whose mode of growth is different from 

 the other two, the frustule being inclosed in gelatinous tubes, its union here is more 



___^ i ^ I 1 IL ' 



oHeib. Krit. Overs. Dan^k. Diat. 107. 18G3. 



