HA RD JFICA'E'S SCIENCE- G OS SI P. 



minute lumps, or distributed in little bags (Beutelchen) 

 which, later on, as in Achnanthes, sometimes form 

 into a four-armed cross, or, as in Desmidium, into 

 one with 3-6 divisions, or sometimes massed into 

 little balls, and apparently empty, and which also 

 invest the stomach cells and also the other organs, 

 as seen in Xanthidium, Euastrum, Micrasterias. 

 Many of these forms probably die after once deposit- 

 ing their ova. Many develop the ova first, and then 

 appear to have comj^leted their cycle. Afterwards 

 the egg mass shows many faint divisions, the original 

 forms are reproduced, and the same cycle of change 

 occurs. Even a male "organ is said to have been 

 found. A single or double ball-shaped organ, 

 analogous to the prostate gland, may be seen in 

 Micrasterias, Arthrodesmus, Tessararthia, Xanthi- 

 dium, and the cognate Acineta. Contractile seminal 

 vesicles have not as yet been observed with certainty. 

 With the phenomena of reproduction (Fortpflanzungs- 

 verhaltnissen) is connected self-division, and which 

 apparently is always lengthwise, so that the conferva- 

 like forms are not thread-like, long, and narrow, like 

 plants, but broad and short. Imperfect division some- 

 times happens from back to ventral part, thus forming 

 ribands, the sides remaining attached to each other 

 (Navicula, Fragilaria), and sometimes from side to 

 side, whereby other (crescent-like) forms are produced, 

 as in Cocconema Eunotia. The double envelope, or 

 internal shell, usually separates ; the external envelope 

 grows and developes, like the envelope of the 

 Volvocina (Kugelthiere), through other laws. These 

 forms often resemble confervid and Fucus-like plants, 

 - which the botanist, not without some appearance of 

 justice, therefore claims as belonging to the vegetable 

 kingdom. No nervous or circulating system has, up 

 to the present time, been detected. 



Catalogue of all the Genera of Diato- 

 mace^ in the Infusionsthierchen. The synonymy 

 is printed in italics. 



1. Achnanthes, Ag. 1822 : Fahnenthierchen ; Con- 

 ferva in part, Muller, 1779 ; Ceramium in part, Roth, 



1806 ; Diatoma in part, Decandolle, 1805 ; Fragilaria 

 in part, Kiitzing, 1833. 



2. Actinocyclus, Ehrenberg, 1833 = Strahlendose.* 



3. Bacillaria, Gmelin, 1788: Zickzackthierchen ; 

 Oscillaria in part, Schrank ; Piuddyr, Nye ; Vibrio \n 

 part, Muller, 1786 ; Conferva in part, Dillwyn, 1809 ; 

 Diatoma in part, Decandolle, 181 5. 



4. Cocconema, Ehrenberg, 1830 : Stelzkorn ; Vibrio 

 in part, Schrank, 1796 ; Kolpoda in part, Schrank, 

 1796; Bacillaria in part, Nitzsch, 181 7 ; Cymbella 

 in part, Agardh, 1S30; Gomphonema in part, Leiblein, 

 1830; Frustulia in part, Kiitzing, 1833; Navicula 

 in part, Corda, 1835. 



5. Cocconeis, Ehrenberg, 1835 : Schildschiffchen. 



6. Echinella, Lyngbye, 1819 : Palmenthierchen ; 



This genus is that now known as Actinoptychus. 



Meridian in part, Agardh, 1824 ; Exilaria, Greville, 

 1827; Licmophora in part, Agardh, 1827; Gompho- 

 nema'va. part, Chauvin 1828 ? Diatoma in part, Jurgens ; 

 Styllaria in part, Bory de St. Vincent, 1822. 



7. Eunotia, Ehrenberg, 1833 : Prachtschiffchen ; 

 Echinella in part, Jurgens ; Navicula in part, Ehren- 

 berg, 1830 ; Frustulia in part, Kiitzing, 1833. 



8. Fragilaria, Lyngbye, 1819 : Bruchstabchen ; 

 Bacillaria in part, Bory ? 1824 ; Vibrio in part, Muller, 

 1786; Frustulia in part, Agardh, 1824; Diatoma in 

 part, Corda, 1835 ; Conferva in part, Muller ; Nema- 

 toplata in part, Bory, 1822 ; Syrinx in part, Corda, 

 1835 ; Paradesmus in part, 1835 ; Gallionella in part, 

 Lyngbye, 18 19 ; Tessella'm part, 1819 ; Grammonema 

 in part, Agardh, 1832. 



9. Frustulia, Agardh, 1824 : Gallertschiffchen ; 

 Cymbella in part, Agardh, 1830. 



10. Gallionella, Boryde St. Vincent, 1825: Dosen- 

 kette ; Conferva in part, Dillwyn, 1S09; Fragilaria in 

 part, Lyngbye, 1819 ; Lysigonium in part, Link, 

 1820 ; Meloseira in part, Agardh, 1824 ; Oscillator ia in 

 part, Lyngbye? Lyngbya in part, Leiblein, 1827. 



11. Gloenema, Agardh, 1812 : Rohrenkorn ; En- 

 cyonema, Kiitzing, 1833. 



12. Gomphonema, Agardh, 1824 : Keilbaumchen ; 

 Vorticella in part, Muller, 1773; Echinella in part, 

 Lyngbye, 1819 ; Styllaria in part, Bory, 1822 ; Den- 

 drella in part, 1824; Crystallia in part, Sommerfeld, 



1831 ; Ulva in part, Hornemann, 1810 ; Meridion in 

 part, Agardh, 1824 ; Frustulia in part, Kiitzing, 

 1833 ; Epistylis in part. 



13. Isthmia, Agardh, 1832: Isthmenthierchen ; 

 Conferva in part, Smith, 1S0S; Diatoma in part, 

 Agardh, 1824; Biddulphia in part, Gray, 1831. 



14. Meridion, Agardh, 1831 : Facherstabchen ; 

 Echinella in part, Greville, 1822 ; Frustulia in part, 

 Duby, 1828 ; Exilaria in part, Ehrenberg, 1830. 



15. Micromega, Agardh, 1827 : Rohrenb'aumchen. 



16. Navicula, Bory de St. Vincent, 1824: Schiff- 

 chen ; Enchclys, Hermann, 1784; Bacillaria in part, 

 Nitzsch, 1816 ; Cymbella in part, Agardh ; Vibrio in 

 part, Muller, 1786; Frustulia in part, Kiitzing, 1833; 

 Oat-animal, Arderon and Baker, 1754; Chaos ; 

 Schrank, 1776; Scalprum, Corda, 1835; Pharyn- 

 goglossa, Corda ; Sigmatella in part, Kiitzing, 1833 ; 

 Surirella in part, Turpin, 1827. 



17. Naunema, Ehrenberg, 1838: Rbhrenschiffchen, 

 Schizonema in part, Agardh, 1824 ; Conferva in part, 

 Trentepohl, 1806 ; Naunema in part, Greville, 1827 ; 

 Bangia in part, Lyngbye, 1829; Girodella in part, 

 Gaillon, 1825. 



18. Podosphenia, Ehrenberg, 1835 : Keilschiipp- 

 chen ; Conferva in part, Vahl, 1792; Echinella in 

 part, Bory, 1824; Licmophora in part, Agardh, 



1832 ; Gomphonema in part, Kiitzing, 1834; Styllaria 

 in part, Bory, 1822 ; Synedra in part, Ehrenberg, 1833. 



19. Pyxidicula, Ehrenberg, 1835 : Kugeldose ; 

 Frustulia in part, Agardh, 1827 ; Cymbelld in part, 

 Agardh, 1830; Gallionella in part, Ehrenberg, 1835. 



