Descendenz u. Hybriden. — Algae. 83 



LEE, ALICE, On Inheritance (Great-grandparentsand 

 Great- great -grandparents and Offspring) in 

 ThoroughbredRacehorses. (Biometrika. Vol. II. p. 231 . 

 1903. 



The great - grandparental and great - great - grandparental 

 correlations are worked out from Mr. Blanchard's tables, the 

 offspring of both sexes being taken together. 



The coefficient of correlation for great-grandparents and 

 oftspring was found to be = 19 y that for great-great-grand- 

 parents and offspring = 15. The paper concludes with the 

 two correlation tables. It is shewn that the decreasing influence 

 of ancestry approximates to a geometrical series of first term '/2 

 and common difference 2 /3. A. L. Pearson. 



LEVEILLE, [H.], Nouveaux hybrides. (Bull. Acad. intern, de 



Geogr. botanique. XII. 1903. p. 554.) 



V Epilobium Mouillefarinei est un nouvel hybride, E. roseum 



X E. trigonum, recueilli dans les Alpes du Dauphine. 



C. Flahault. 



BOLOCHONZEW, Beobachtungen über das Phytoplankton 

 der Wolga im Sommer des Jahres 190 2. [Mit 

 Tabellen der Periodicität und einer Tafel.] (Sep.- 

 Abdr. Jahrbuch d. Biolog. Wolga-Station. Ssaratow 1903.) 



Es theilt sich die Arbeit in drei Kapitel. Im ersten giebt Verf. 

 ein Verzeichniss der von ihm gefundenen Planktonorganismen, die er 

 in drei Kategorien vertheilt: 1. Die echtplanktonischen Organismen, die 

 vorwiegend zum Leben in suspendirtem Zustande angepasst sind. Hier- 

 her gehören: Clatlirocystis aeruginosa Henf., Microcystis sp., Tetrapedia 

 emarginata Schröd., Anabaena flos aquae Breb., An. spiroides Klebahn, 

 .4/;. macrospora Kleb. var. crassa Kleb., Aphanizemenon flos aquae Ralfs., 

 Asterionella formosa Kg., Ast. formosa v. Ralfsii N. H., Ast. formosa 

 v. gracillima Grün., Fragillaria crotonensis Kitton, Frag, capucina 

 Desmoz., Frag, virescens Ralfs, Fr. mutabilis Grün., Synedra Ulna Ehrb. 

 v. aetinastroides Lemm., Syn. actis Grün. v. delicatissima Grün., Tabel- 

 laria fenestrata Kg. v. asterionelloides Grün., Diatoma elongatum Ag. v. 

 tenue V. H., Melosira distans Kg., Melos. crenulata Kg-, Mel. granulata 

 Ralfs, Mel. granulata var. ciirvata Grün., Cyclotelea comta Kg. var. 

 radiosa Grün., Stephanodiscus Hantzscliianns Grün., Attheza Zachariasi 

 Brun., Nitzschia acicularis W. Sm., Surirella spiralis Kg., Staurastrum 

 gracile Ralfs, Staurastrum paradoxum Meyen, St. paradoxum var. chaeto- 

 "cerus Schröd., Volvox glabator Ehrb., Volv. minor Stein., Pandorina 

 morum Bonz., Eudorina elegans Ehrb., Gonium pectorale 0. F. M., 

 Chlamydomonas monadin a Stein., Chi. Reinhardt Doug., Chi. globulosa 

 Perby, Pteromonas alata Seligo, Pterom. spec, Tetraspora gelatinosa 

 Desv., Botryococcus Braunii Kg., Scenedesmus denticulatus Lagh., Seen, 

 arcuatus Lemm., Seen. Opoliensis Rieht, var. carinatus Lemm., Pediastrum 

 Boryanum Menegh., Ped. duplex Meyen, Ped. duplex var. clathratum 

 A. Br., Ped. duplex var. asterum A. Br., Polyedrium sp., Tetraedron 

 fimneticum Borge, Ophiocytium capitatu/n WoUe, Oocystis lacustris Chod., 

 Crucigenia triangularis Chod. , Crucigenia reetangularis Naeg. , Cruc. 

 Lanterherni Schmidle, Actinastrum Hantzschii Lagh., Act. Hantz. v. 

 iluviatilis Schröd., Schröderia <setigera Lemm., Acanthococcus hirtus 

 Remsch., Acanthosphaera Zachariasi Lemm., Richtet iclla botryoides 

 Lemm., Rieht, botryoides var. fenestrata Schröd., Cohniella statirageniae- 



6* 



