. The Cambridge natural history. Zoology. 224 PORIFERA Fig. 110.—Megascleres. a-l and q-s. Modifications of monaxon type, a, Stron- gyle ; h, tylote ; c, oxea ; d, tylotoxea ; e, tylostyle ; /, style; g, spined tylo- style ; h, sagittal tried (a triaxon form derived from monaxon); y,oxytylote; k, anatriaene ; I, protriaene ; " m, sterraster (polyaxon) ; », radial section through the outer part of m, show- ing two actines soldered together hy intervening silica; o, desma of an Anomocladine Lithistid (polyaxon) ; q, crepidial strongyle, basis of rhab- docrepid Lithistid desma; r, young form
. The Cambridge natural history. Zoology. 224 PORIFERA Fig. 110.—Megascleres. a-l and q-s. Modifications of monaxon type, a, Stron- gyle ; h, tylote ; c, oxea ; d, tylotoxea ; e, tylostyle ; /, style; g, spined tylo- style ; h, sagittal tried (a triaxon form derived from monaxon); y,oxytylote; k, anatriaene ; I, protriaene ; " m, sterraster (polyaxon) ; », radial section through the outer part of m, show- ing two actines soldered together hy intervening silica; o, desma of an Anomocladine Lithistid (polyaxon) ; q, crepidial strongyle, basis of rhab- docrepid Lithistid desma; r, young form of rhab- desma, showing crepidial strongyle coated with successive layers of silica; s, epid docrepid rhabdocr 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. (Skeleton reticulate or fibrous ..... 34' Skeleton radiate or diffuse . . .37 Skeleton with radiating fibres forming a reticulum -with others crossing them at right angles .... Quasillina TNo mioroscleres . . . .35 -! Microscleres sigmata and\ I,,. , . >toxa with or without trichodraemata Microscleres siemata or I t, ,, '^ D y Vesmacella ("Sponge fan- or funnel-shaped . . .36 \ Sponge not fan- or funnel-shaped . Hyineniacidon ("Megascleres slender and twisted . . Fhakellia \Megascleres somewhat stout, not twisted . Tragosia ("Sigmata present, skeleton diffuse . . Biemma \Sigmata absent . . . .38 ("Skeleton more or less radiate . . .39 \Skeleton diffuse; sponge boring . . GKona ("Sponge discoid with marginal fringe . . Halicnemia \Sponge massive or stipitate without marginal fringe . 40 ("Sponge body prolonged into mammiform projections . Polymastia \Sponge body without mammiform projections . .41 ("No mioroscleres. Megascleres tylostyles with or without styles -! Suberites [Microscleres centrotylote. Megascleres styles or tylostyles FicuUna ("Choanosomal megascleres smooth . . .43 \Choanosomal megascleres spined . . Dendoryx {Microscleres chelae and sigmata of about the s
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
