"The geographical and bathymetrical distribution of the hydroids." . I Pi d V 1 x • V vlalxvc 7 4 0-/ T1 T e\ YDpi y* *i q i trytR onp n 1 X • lyCfeXcLJliCbX X 9 \ V CXXXXJ v I1C VXCX1 / ± + \u-jro T•c ornucopiae(Bonnsvis) - T. coutliouyi( Agass iz) dt X •CI 19 Uct ucA V iVxw\>X vXtxy / 4- 4- a -/ T • c0ocea (Agass iz) + -1-4- 4- T • f*ormosa( Hartlaub) 4- X • t^X Ci. O X X X O \ VU XXXJ v 11 XXX exu / -4- 4-4- T .hari)4mani( Hutting) + (Hickson&:Gr.) ^ + /J a n> toi ATT vi »I »JlUiT:li-XS V «mi»Xl / + 0-*~ 1 • Vi Set V xjililJCtt; Ud l + 4-4- T • in si grii
"The geographical and bathymetrical distribution of the hydroids." . I Pi d V 1 x • V vlalxvc 7 4 0-/ T1 T e\ YDpi y* *i q i trytR onp n 1 X • lyCfeXcLJliCbX X 9 \ V CXXXXJ v I1C VXCX1 / ± + \u-jro T•c ornucopiae(Bonnsvis) - T. coutliouyi( Agass iz) dt X •CI 19 Uct ucA V iVxw\>X vXtxy / 4- 4- a -/ T • c0ocea (Agass iz) + -1-4- 4- T • f*ormosa( Hartlaub) 4- X • t^X Ci. O X X X O \ VU XXXJ v 11 XXX exu / -4- 4-4- T .hari)4mani( Hutting) + (Hickson&:Gr.) ^ + /J a n> toi ATT vi »I »JlUiT:li-XS V «mi»Xl / + 0-*~ 1 • Vi Set V xjililJCtt; Ud l + 4-4- T • in si griis (Allman) T•kerguelenens is(Studer) T .l£.rynxtJ;llis&; o - J~v / + (Torrey) + « - 3 embryanth emum(All.) +? (Allman) + 4- -J-7 (Hargitt)(Allman)T. py gma ea (Lamo ur o ujc )(Bale) 4- 4-++ 4- (Boeck) 4- jiy-f* )(Warren)(Agassiz) + o -Io -/» (Agassiz)() + I 4-. 49 North Atlantic , • notably holarctic forms. A record of the bathymetrical distribution of 60species of the Tubularidae (1 is free-swimming, 1 wasfound afloat) shows that again the family is most abun-dant in Zone I, the number in deeper zones steadily de-creasing. The Tubularidae, then, have migrated out from acenter in the North Atlantic, and are a shallow-waterfamily. Medusae are of little or no importance in dis-tribution, since the genus Tubularia produces no medusae. 8. Halecidae,. The Halecidae form the connection between the Gymno-blastea and the Calyptoblastea, or hydroids proficed witha polyp-cup or hydrotheca, by reason of their partiallydeveloped hydrotheca. In mode of life and other habitsthey do not differ from the other hydro id families. The South Alaskan province leads in number of species,with the Continental-Mediterranean area second and the eastcoast of llorth America third. The family includes 6 genera a
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Keywords: ., bookcentury1900, bookdecade1920, bookidthegeographi, bookyear1921
