"The geographical and bathymetrical distribution of the hydroids." . (lTutting)(Busk)(Allman) ^(Kirchenpauer)(Kirchenpauer) ic ii(Levinsen)(Bale)(Allman)(Allman)l\hippisleyana(Allman)(Allman)T. immerse (ITutting)(Peeppig)r (Stimpson)( Allman)T. 1ichenaatrum(Pallas)(Ellis&(Stechow)(Kutton)()(Allman)(Allman)! ( Clarke) (Allman)j ca rpa(K ir chenpauef .ramosissima
"The geographical and bathymetrical distribution of the hydroids." . (lTutting)(Busk)(Allman) ^(Kirchenpauer)(Kirchenpauer) ic ii(Levinsen)(Bale)(Allman)(Allman)l\hippisleyana(Allman)(Allman)T. immerse (ITutting)(Peeppig)r (Stimpson)( Allman)T. 1ichenaatrum(Pallas)(Ellis&(Stechow)(Kutton)()(Allman)(Allman)! ( Clarke) (Allman)j ca rpa(K ir chenpauef .ramosissima(Allman)T. rebusta(Clarke)(Clarke)(Bale)(()! (Bale)(Clarke)T. thuj a(Li nna eus)I uli fc ((Gray). r) -h-h-h + + 1 4- der +-+?+ — ti* ~ <3o 2. * r) + 4- 4 TEyroscy :- T. i r t e rm e d i us (C o n gdo n) (Allman) -h +? ( Jacterholm)( T. v i t i e ns is (Ma r ktanner-. ? 0 -f- -hi-? + -h -h fc-h ++- o -/a ± ft 60 more southern provinces; b) only 23 of the 96 species ofSertularella are not found within or south of the tropics;of these, 17 are local, and of the 17, 7 are from Japan orHawaii, the faunaa of both fehe3e regions being most closelyallied to that of Australia and Oceania. This leaves only15 species which at the present tiae are 3trictly northern,or les3 than one-sixth of the genus, presenting a strongargument in favor of antarctic origin. The Australian area seems to be the center from whichthe migration has gone on. The west-flowing currents havecarried the hydroids into the Atlantic, via the Mascareneand South African provinces, and thence to the llorth Atlantic. In depth, Sertularella is equally abundant in Zones Iand II,
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Keywords: ., bookcentury1900, bookdecade1920, bookidthegeographi, bookyear1921
