NOTES AND OBSERVATIONS ON BOARD H.M.S. RATTLESNAKE 95 



merely to show the tendency of the evidence now extant as clearly 

 and broadly as possible ; — rather to draw out a brief than to pronounce 

 a judgment. 



The following are the autliorities referred to in the text :— 



Von Siebold. Vergleichende Anatomie d. Wirbellosen Thiere, p. 7-25. 



Ueber einzellige Pflanzenu. Thiere. Sieboldund Kolliker's Zeiischrift, 1849. 



Dujardin. Histoire naturelle des Zoophytes Infusoires. 



Cohn. Nachtr'age zur Naturgeschichte des Protococcus pUivialis. Nova Acta Acad. 



Nat. Cur. 1850. 

 Pineau. Svir le Developpement des Infusoires. Annales des Sciences, 1845. 

 Stein. Untersuchungen i'lber die Entwickelung d. Infusorien. JViegiiiamt's ArcMv. 



1849. 



. Ueber die Natur d. Gregarinen. Mailer's Archiv, 1848. 



Kcilliker. Ueber die Gattung Gregarina. Siebold iimi Kolliker's Zeitschrift, \%t^%. 



. Das Sonnenthierchen. Ditto, 1849. 



Quatrefages. Observations sur les Noctiluques. Annales des Sciences, 1S51. 

 Hogg. Upon Spongilla. Trans. Linn. Soc. vol. xviii. 

 Carter. On Spongilla. Annals of Nat. Hist. 1849. 



