The porifera and coelentera . Fio. 48. —Dia<;rain of the structure of Velella, showiiiiL, llie central and peripheral thirds ofa half-section of the colony, the middle third being omitted. I he ectwlenn is indicated byclose hatchin,, the endodenii by li^ht hatching, the mesogloea by thick black lines, the homyskeleton of the pneumatophore and sail by dotting. /;/,, blaslostyle ; C, centnidenia ; D, dacty-lozooid ; EC, edge of colony, prolongiil V)eyond the pneinnatophore ; ii, cavity of the largecentral gastrozooid ; ,U, mednsoids attached to blastostyles ; iA, i)rimary central chamber,
The porifera and coelentera . Fio. 48. —Dia<;rain of the structure of Velella, showiiiiL, llie central and peripheral thirds ofa half-section of the colony, the middle third being omitted. I he ectwlenn is indicated byclose hatchin,, the endodenii by li^ht hatching, the mesogloea by thick black lines, the homyskeleton of the pneumatophore and sail by dotting. /;/,, blaslostyle ; C, centnidenia ; D, dacty-lozooid ; EC, edge of colony, prolongiil V)eyond the pneinnatophore ; ii, cavity of the largecentral gastrozooid ; ,U, mednsoids attached to blastostyles ; iA, i)rimary central chamber, amiiiV, a concentric chamber of the i)nenmatophore, the fonner showing the opening into theHecond chamber, the latter showing an ojiening to the exterior, and a trachea ; .s, .sail. 48f(.—iorynta from the aboral aspect, showing the jineuinatophore, and expanded dactylo-zooids. (After Agassiz.). Fio. iSb.—Stephalia corona, a young colony. (After Uaockel.)
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora
