SYNOPSIS OF THE BOTATORIA. 19 



Brachionus palea Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831), 1832, p. 146, pi. 3, 



fig. 8. 

 Brachionus pala Ehrenberg, Infusionsth., 1838, p. 511, pi. 63, fig. 1; not Brachionus 



pala Miiller, 1786. 

 Brachionus amphiceros Ehrenberg, Infusionsth., 1838, p. 511, pi. 63, fig. 2. 

 Aymrsea divaricata Weisse, Bull. Phys.-Math. Acad. Sci. St. Petersburg, vol. 4, 1845, 



p. 142, pi. 2, figs. 13, 14. 

 Brachionus diacanthus Schmarda, Denkschr. Akad. Wiss. Wien, vol. 1, pt. 2, 1850, 



p. 14, pi. 4, fig. 4. 

 Brachionus oon Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 202. 

 Brachionus dorcas Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 203. 

 Arthracanthus quadriremis Schmarda, Denkschr. Akad. Wiss. Wien, vol. 7, pt. 2, 



1854, p, 12, pi. 5, fig. 1. Type (by original designation) of genus Arthracanthus 



Schmarda, 1854. 

 Arthracanthus hiremis Schmarda, Denkschr. Akad. Wiss. Wien, vol. 7, pt. 2, 1854, 



p. 22, pi. 6, fig. 5. 

 Arthracanthus quadriremis ScKMARDA, Neue wirbell. Thiere, 1859, vol. 1, p. 66. Type 



(by present designation) of genus Arthrocanthus Schmarda, 1859. 

 Arthrocanthus hiremis Schmarda, Neue wirbell. Thiere, 1859, vol. 1, p. 66. 

 Brachionus margoi Daday, Math. Term. Ert., vol. 1, 1883, p. 290. 

 Brachionus lotharingius Imhop, Zool. Anz., vol. 8, 1885, p. 722. 

 Brachionus decipiens Plate, Jenaische Zeitschr. Natm-w., vol. 19, 1886, p. 73. 

 Brachionus dorcas spinosus Wierzejski, Bull. Soc. Zool. France, vol. 16, 1891, p. 52, 



fig. 4. 

 Brachionus pentacanthus France, Term. Fiiz., vol. 17, 1894, pp. 118, 172, pi. 5, 



figs. 3, 4. 

 Brachionus tetracanthus Collin, Deutsch-Ost-Afrika, vol. 4, No. 15, 1897, p. 7, fig. 8. 

 Brachionus quadricornis Meissner, Compt. Rend. Stat. Biol, du Volga (for 1901), 1902, 



p. 34, pi. 11, fig. 17; not Brachionus quadricornis Schrank, 1803. 

 Brachionus amphiceros borgerti Apstein, Zool. Jahrb., Syst., vol. 25, 1907, p. 211, fig. 

 Brachionus pala willeyi Apstein, Zool. Jahrb., Syst., vol. 25, 1907, p. 213, fig. 

 Brachionus pala anuraeiformis Brehm, Arch. Hydrobiol., vol. 4, 1909, p. 210. 

 Brachionus anurseiformis Brehm, Arch. Hydrobiol., vol. 4, 1909, p. 210, fig. 



BRACHIONUS CAPSULIFLORUS Pallas. 



A multitude of names have been thrown into the synonjrmy of 

 this species for the simple reason that they do not appear to be 

 entitled to specific rank. Brachionus capsuliflorus Pallas is so vari- 

 able, in fact, it is difficult to find two specimens alike, that to intro- 

 duce names for each form would practically amount to giving 

 individual names, a task of considerable magnitude. The presence 

 or absence of a foot sheath has been suggested as a distinguishing 

 characteristic between the two main lines, Ehrenberg's Brachionus 

 urceolaris and Brachionus haJceri. Unfortunately, this is almost as 

 variable as the spines and may be found in all stages of development. 

 Added to this, Kratschmar's ^ recent experiments on the closely 

 related genus Keratella (=Anursea), seem abundant justification for 

 the proposed union. If the form with posterior spines is to be sepa- 

 rated, it must take the name Brachionus quadridentatus Hermann, 



iKratschmar, H., Ueber den Poylmorphismus von Anurcea aculeata Elirbg. in Int. Rev. Hydrobiol., 

 vol. 1,1908, pp. 623-675. 



