Report on the scientific results of the voyage of Challenger during the years 1873-76 : under the command of Captain George S Nares, , and Captain Frank Turle Thomson, . of such a simple, loose Hexactinellidl)ody, could be devised than the regular hexacts,disposed in such a way that one radial ray unitesthe two bounding lamellae, while the second is tangential, and the third longitudinal (fig. 13), justas they do indeed occur in the simplest Lyssacina,Ilolascus, Bathydorus, &c. By the firm union of all such hexacts a lattice-work is formed such as we find to be developed w
Report on the scientific results of the voyage of Challenger during the years 1873-76 : under the command of Captain George S Nares, , and Captain Frank Turle Thomson, . of such a simple, loose Hexactinellidl)ody, could be devised than the regular hexacts,disposed in such a way that one radial ray unitesthe two bounding lamellae, while the second is tangential, and the third longitudinal (fig. 13), justas they do indeed occur in the simplest Lyssacina,Ilolascus, Bathydorus, &c. By the firm union of all such hexacts a lattice-work is formed such as we find to be developed withalmost ideal regularity in the younger portions ofFarrea. As the wall becomes thicker new layersof similar regular hexacts are laid down, as we findbest developed among the Lyssacina in Holascus Jihxdatus, and among the Dictyoninain the older portions of i^arrea-stocks, but more or less distinctly in all Dictyonina andmost Lyssacina. Thus it appears that a consideration of the mechanical conditions of the soft partsto be supported affords in this case also an insight as to the utility of the specificstructure of the skeletal elements as here represented by the regular Flo. 13.—Arrangement of Hexacts betweenthe chambers. INDEX. The more important references are indicated by heavier figures. Acanthascus, n. gen., 145, 375. „ cactus, n. sp., 148, 375 (PI. Ivii.). „ duhius, n. sp., 147, 375 (PI. Ivii.). ,, (jrossularia, n. sp., 145, 375 (PI. Ivi.). Acantlwspomjia, Salt, 14, , , Eurete marshallt, 297. „ Eurctc semperi, , 7. Aega spongiopliila, passages, , 61. ,, exploration by, speciosum, 5, , 36, 48; firtree-Iike, 212; largest, 202; peculiar, , 178, 380; phylogeny, , 48. Anderson, T., 18; on Japanese sponges, thickening, 171, 173, , Ocean, Balanifes, 122; Holascus, 368; Polyrhahdus, Islan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscienti, bookyear1887
