1— A spinous variety of Eucyrtidium Ampullus, (?) the narrow end prolonged into a tuliulous siiine,— diam. of bulb, .00275. Chimborazo, Barbados.
2— Podocyrtis(?) wliole height, .0112; breadth, 0055; height of cupola, .0027. Professor J. Muller says, "in all the flask and bell-shaped Polyeystins, the first joint (glied) of the reticulation begins from the top, and the number of the increasing links progresses with growth in a definite ratio." The links of the lower part in this fossil skeleton seem running into each other irregularly, like dropped stitches in a stocking, or bursting bubbles in a gelatinous film while solid-
3— A further variation of Podocyrtis Schomburgkii, as shewn on plate I, fig. 3.
4— A modification of fig. 2, on plate I.
4 & 6— Tlie reticulations progressing further towards the "Ladder" or Lattice-shape. In fig. 6, the inner net is very plainly seen, its reticulations are also square, with quarter-inch objective magnifying power used, about 470 linear. Springfield, Barbados. In another slide is a broken-oft' top of one of these Ladder- Pyramids, with the narrow neck swelling out into the surmounting ball nucleus (?)
