MANN DIATOMS 01 l Ml. LLBATROSS VOYAGES. 371 



COCCONEMA Hemp. & Ehrenb. 



' a Hemp. & Ehrenb. in Ehrenb. Syinb. Phys. Evertebr. 9. pi. I\ 



L828. Ehrenb. Phys. Abh. Akad. Wise. Berl. 1829: L5. L830 [nfus.223. \ 

 j. ;. L838; Mikrog. pi. 10. I. f. 18. L854. Km/. Bacill. ^<». r l. >,. /. /. 1844. p r itch. 

 Bist. Infus. ed. 3. 877. pl.W.f. 194 Has* Hist. Brit. Alg. 1: 425. pi. 



101. f. 1. L845. Schmidt, Atlas i>I. 10. f. l 35. L875. \V. Smith, Synop. Brit. 

 Diat. 1: 75. pi. 23./. - Grin Denkschr. Akad. Wien 48 2 : 97.pl. 1. 



L884. Griff. & Henf. Micr. Di< 1. ed. 3. I^«>. pi. 12. f. 19 20. L875. II. I.. Smith, 

 Sp. Dial. Typ. qo. 80 85. L874. Wolle, Diat. N. A. pi. 6.J. 1 ■',. s 9, 1: 



llaria Gmel. in part; Hemp. & Ehrenb. in Ehrenb. Symb. Phys. pi. 2. IV. f. 10. 

 L828. 

 Cymbella C. Ag. Consp. I. L830. Km/. Bacill. 79. pi. 6. f. 11. L844. Rabh. Fl. 

 Eur. Alg. 1:10, 77./. 20. 1864. Brun. Diat. Alp. 55. pi. 3. J Van 



II. in. Synop. 59. pi. :./. 1 19. L881. Truan, Anal. Soc. Espan. Hist. Nat. 13: 

 336. pi. :../'. '. 1 :. L884. W. Smith, Synop. Brit. Diat. 2: 84. L856. Pritch.Hist. 

 Infus. ed. 4. 875. pi. ; L861. II. L.Smith, Sp. Diat. Typ. uo. L15- I-':;. 



L874. II. L. Smith, The Lena 1: 76. L872. G 1. Journ. Micr. Sci. 3: 



4. pi. i.f. 17-21. L856. De Toni, SyU. Alg. 2: 349. L891. Wolle, Diat. N. A. pi. 7. 

 f.1-85. L890. Cleve, Sv. Vet. Akad. Handl. 26 3 : 156. L894. Heib. Krit. 

 Danske Dial. 107. L863. 

 Gomphonema Ag., in part; C. Ag. Consp. :'>•'.. L830. Kin/.. Linnaea 8: 564. j>l. ■]. 



f. 52. L833. 

 Frustulia Ag. in part; Km/. Linnaea 8: /. 10. L833. Menegh. in Kutz. Sp. Alg. 59. 



1849. 

 Encyonema Kin/. Linnaea 8: 589./. 73. L833. Elabh. Fl. Km-. Alg. 1: 11,85. j 

 1864. Van Heur. Synop. 65. pi. S.J. 9-23. 1881. Kutz. Bacill. 82. pi. 22. f. 1. 

 L844. Pritch. Hist. Infus. ed. 4.879. pi. '. / ./. 22. L861. W.Smith, 



Synop.Brit. Diat.2: 67. pi. 54-f- 345. L856. Schmidt, Atlas pi. 10. L875. 



Hass. Hist. Brit. Alg. 2: 439. pi. 100. f. 10. 1845. De Toni, Syll. Alg. 2: 371. 1891. 

 Syncyclia Ehrenb. Phys. Abh. Akad.Wiss. Berl. 1835: 174. L837; Infus. 233. pi. 20. 

 f. 11.1838. Kin/. Bacill. 81. pi. 22. f. 2. L844. Pritch. Him. [nfus. ed. 4. 879. pi. 

 7./.5S, pi. 10. f. 206. L861. Rabh. Fl. Fur. Alg. 1: II. '.'7./. ... L864. Griff. A 

 Henf. Micr. Diet. -1. 3. 7:.!'. pi. : ../. / .. 1875. De Toni, Syll. Alg. 2: 375. L891. 

 tfawcuZaBory,inpart; Ehrenb. Infus. 184. pi. ?. 183£ 



Cymbophora Breb. in part; Breb. A: God. Consid. Diat. 11. L838 cf. Van Heur. 



Synop. pi. •;../'. 19. L881 . 

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

 pi. 5. //./. 1/. 1854. 



Tin- claim of Heiberg a thai Cocconema and Cymbella Bhould !"■ united i> quite 

 generally conceded. They differ solely in that the former grows attached to a L r -lai- 

 inoufi stipe. Tin- 1-. of cours( . a- truly a morphological characteristic a- anything 

 connected with the siliceous frustule. Km to admit such a distinction i.- impossible 

 in this group of plants, livm in living forms Cocconema is < ertain to become detached 

 in large masses from the stipes; ami 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 diatoms are Schizonema < '. Au r while in 

 their gelatinous tubes, but clearly Navicula Bory when set free; and Eunotia Ehrenb. 

 is identical with Himantidium Ehrenb. when the latter is out of its gelatinous ii 

 ment. Km in the selection of a generic name B r utterly trivial reasons, ; 



over tin- older name Cocconema and chose Cymbella, and In- selection has been L r «'n- 

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

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

 the other two. the frustul< being inclosed in gelatinous tubes, it.- union here is more 



Heib. Krit. Overs. J>an-k. Diat. L07. L863. 



