. Polycystins, figures of remarkable forms &c. in the Barbados chalk deposit (chiefly collected by Dr. Davy, and noticed in a lecture delivered to the Agricultural Society of Barbados, in July, 1846) . docyrtis (?) whole height, .0112; breadth, 0055; height of cupola,.0027. Professor J. Sliiller says in aU the flask and beU-shapedPolycystins, the first joint (glied) of the reticulation begins fromthe top, and the number of the increasing links progresses withgrowth in a definite ratio. The links of the lower part in thisfossil skeleton seem rimning into each other irregularly, likedropped stit
. Polycystins, figures of remarkable forms &c. in the Barbados chalk deposit (chiefly collected by Dr. Davy, and noticed in a lecture delivered to the Agricultural Society of Barbados, in July, 1846) . docyrtis (?) whole height, .0112; breadth, 0055; height of cupola,.0027. Professor J. Sliiller says in aU the flask and beU-shapedPolycystins, the first joint (glied) of the reticulation begins fromthe top, and the number of the increasing links progresses withgrowth in a definite ratio. The links of the lower part in thisfossil skeleton seem rimning into each other irregularly, likedropped stitches in a stocking, or bursting bubbles in a gelati-nous film while solidifying. 3.—A further variation of Podocyrtis Schomburgkii, as shewn on plate I, fig. —A modificatiou of fig. 2, on plate I. 6 & —Tlie reticulations progressing further towards the iarfrfe/,or Lattice-shape. In tig. 6, the inner net is very plainly seen,its reticulations are also scpiare, with (juarter-inch magnifyingpower used, about 470 linear. Springfield, Barbados. In ano-ther slide is a broken-oft top of one of these Ladder-Pyramids,with the narrow neck swelling out into the surmounting ballnucleus (?). USA PLATE Xin. FIG. 1 & 2.—Front and side view of a globose, slightly conical body, prettyregularly areolated, and surrounded by a rounded honeycombedriflg. I am indebted to Dr. Greville for poiiiting out the frontview, as belonging to the same object, which he decided^ to benot a Diatom. Can it belong to Stephanopyxis or Xantho-pyxis or some of that obscure group which even Ehrenbergregards as very doubtful Diatoms ? See Pritchard, page a very beautiful object, but difficult to get a good view of,as the ring and the globe require different foci. In slide,VaughansBarbados, No. 1; magnified about 400 diameters. 3.—Probably a variety of the Dictyospiris on Plate II, fig. 2, and PlateXI, fig. 4, but with a greater number of spines, and differentlyarranged. 4.—Possibly a Lyc
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Keywords: ., bookauthorburyedwardmrs, bookcentury1800, bookdecade1860, booksub
