PLATE XIV
1. Astromma (?) A rhomboidal shaped mass of a very confused sponge-like web of fine tangled threads ; inclosing in the middle a dark areolated ball. Four sharp spines protrude from the web at right angles, and measure from point to point •01714.
2, 3, 4. Varieties of Astromma Aristoteles (?)
5. A more complete specimen of Rhopalastriun lagenosum. Mik. PL XXII, fig. 22.
6. Central part of a similar organism. These beautiful crosses, with and without balls or spines at the ends of the arms, are very frequent in the deposit from Mt. Hillaby, Barbados. For the selected slides of that material from which the figures in this and the following plate are chiefly drawn, I am indebted to Geo. Mansfield Browne Esq.
