146 Alsrae 



&■• 



17. C. Abies-mariiia C. Ag., 18. C. corniculata Hauck. 



F. Plante cespiteuse feuillee; plusieurs tiges dressees: 



19. C. caespitosa Sauv., 20. C. atnentacea Bory, 21. C. 

 stricta Sauv., 22. C. balearica Sauv. 



G. Plante cespiteuse non Teuillee; plusieurs tiges dressees: 



23. C. crmita ßory, 24. C. hrachycarpa J. Ag., 25. C. 

 hosphorica Sauv., 26. C Myrica C. Ag., 27. C. canariensis Sauv., 28. 

 C. humilis Kütz., 29. C. niyrio phylloides Sauv., 30. C. foeniculacea 

 Grev. emend., 31. C. discors C. Ag. emend., 32. C. Hoppii Val., 33. 

 C. abrotanifolia C. Ag. 



Tel est, resume dans ses grandes lignes, le travail de Sau- 

 vageau. P. Hariot. 



Virieux, G., Quelques Algues de Franche-Comte rares 

 ou nouvelles. (Bull. Soc. Hist. nat. Doubs. W 21. 10 pp. 1 fig. 

 texte. 4 avril 1911.) 



Virieux poursuit avec succes ses etudes sur les Algues de la 

 region jurassienne. Dans ce memoire il Signale un certain nombre 

 d'especes, de varietes et de formes nouvelles: Vaucheria tervestris 

 D.C. var. diandra, presentant presque constamment deux antheridies 

 sur chaque rameau fruciifere; Raphidiurn Bosnü)\ae, sur un Cla- 

 docere, le Bosmina longirostris, voisin des R. longissitnuni Schroet. 

 et. falcatum var. niirabile West; Botryococcus Braiinii xzx. perarnia- 

 tus et mucicoln; Dinobvyon gregariuin se rapprochent du D. sessile 

 Tanner — FuUeman et de quelques Derapyxis; Closterium malinver- 

 niariwn f. inßata; Euastniin Magnini voisin d'E. genimatuiii\ Spiro- 

 gyra jugalis f. minor., PJiormidiiun purpitrascens var. cincinnaiHm\ 

 Chroococcus Rochei, se rapprochant des Microcystis, mais sans tegu- 

 ment commun. 



A noter comme especes interessants: Gloeochaete Witti'ockicnta 

 {Schrammia barbata Dangeardj; Hydrocoleiun heterotrichicm Gomont, 

 de Dalmatie; Hapalosiphon 'nibenncus W. et G. S. West; Rividaria 

 Beccai'iana de Not.; Spirogyra crassa var. iassensis Teod.; Cosmanuni 

 Pokovnyanuni West; Gloeotoniiini Loillesbergianum Hansg., de la 

 Carniole et de la Carinthie; Dicvanochaete reniforniis Hieron. 

 que le regrette Lemaire avait recueilli ä Gerardener; Batra- 

 chospevmum Dillenii var. teiniissimum Sirodot etc. P. Hariot. 



Wager, H., On the Eflect ot Gravity upon the Movements 

 and Aggregation o t" Euglena viridis, Ehrb., and other Micro- 

 organisms. (Phil. Trans. Rov. Soc. B. 201. p. 333—390. t. 32—36. 

 1911.) 



The author tound that the action ot' the physical forces, gravit}' 

 and molecular attraction, over which Euglenae have little or no 

 control appears. therefore, to play an important part in their life- 

 history, and whilst not inhibiting their power to mov^e, compels 

 them to limit the sphere of their activity to certain definite areas 

 in such a way as to promote a more or less regulär dissemination 

 of them through the liquid, and thus prevent any undesirable 

 congestion of the organisms in one place. 



It is obviously an advantage to such motile organisms as 

 Euglenae that they should not become too much crowded either at 

 the surface of the water in the light or in the deeper layors of the 

 liquid on the mud. 



