. Natural science: a monthly review of scientific progress . —ms Structure of Retioloidea. Fig. 10.—Siomatogyaptus turnquisti, part of the net-work. Fig. ii.—Retiolitesgeinitzianus, the main strands of the net-work. Fig. 12.—Retiolites nassa, proximal endfrom the anti-virgula side. Fig. 13.—The same from the virgula side. Fig. 14.—Distal end of same, showing main strands only. Fig. i^.—Dictyonema rarum, a portionfrom the side, showing nest-shaped organs. All greatly enlarged. tw, thecal wall, im, thecal mouth, rt, rudimentary theca. v. virgula. rv, straightvirgula. zv, zigzag virgula. il, inne
. Natural science: a monthly review of scientific progress . —ms Structure of Retioloidea. Fig. 10.—Siomatogyaptus turnquisti, part of the net-work. Fig. ii.—Retiolitesgeinitzianus, the main strands of the net-work. Fig. 12.—Retiolites nassa, proximal endfrom the anti-virgula side. Fig. 13.—The same from the virgula side. Fig. 14.—Distal end of same, showing main strands only. Fig. i^.—Dictyonema rarum, a portionfrom the side, showing nest-shaped organs. All greatly enlarged. tw, thecal wall, im, thecal mouth, rt, rudimentary theca. v. virgula. rv, straightvirgula. zv, zigzag virgula. il, inner strand, pi, parietal strand, ml, mouth , main side strand, limiting the thecal field and the anti-virgula field, ic, initialcanal. 242 NATURAL SCIENCE. October. in the arrangement of the meshes may be traced, in the fact that onthe virgula-side (Fig. 13) stouter strands bend downward and runround. These join the virgula at an acute angle. In the specimenhere represented they are only five in number. The proximal one issomewhat coa
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