_Comparative View of the Species of Fossil Radiolaria from Barbados made known by the figures of Bury in 1862 and of Ehrenberg in 1875._ +-------------------+--------------------+--------+-----------+-------+ | Legion. | Order. | Bury. | Ehrenberg.| Total.| +-------------------+--------------------+--------+-----------+-------+ | I. Legion | { 1. Sphæroidea | 16 | 13 | 29 | | SPUMELLARIA | { 2. Prunoidea | 10 | 8 | 18 | | (PERIPYLEA). | { 3. Discoidea | 37 | 33 | 70 | | | | | | | | II. Legion | { 4. Stephoidea | 5 | 2 | 7 | | NASSELLARIA | { 5. Spyroidea | 13 | 38 | 51 | | (MONOPYLEA). | { 6. Cyrtoidea | 60 | 188 | 248 | +-------------------+--------------------+--------+-----------+-------+ | Total, | 141 | 282 | 423 | +----------------------------------------+--------+-----------+-------+ {clxvi}In 1882 Bütschli still further increased the number of known Radiolaria from Barbados both by figures and descriptions (L. N. 40), and gave in particular a very accurate morphological analysis of 12 new NASSELLARIA (3 #Stephoidea#, 3 #Spyroidea#, and 6 #Cyrtoidea#; L. N. 40, Taf. xxxii., xxxiii.). The number of the fossil species collected in the Barbados marl is, however, greater than would appear from the above-quoted communications. My respected friend, Dr. R. Teuscher, of Jena, has, at my request, made a large number (about a thousand) of very accurate drawings with the camera lucida of Polycystina from Barbados (see p. 1760). From these it appears that the variations in the structure of the shells, with respect to number, size, and form of the lattice-pores, of the spines, &c., is much greater than would be supposed from the figures of Ehrenberg and Bury. I have thus come to the conviction that the number of species from Barbados (using the word "species" in the sense understood by those authors) is not less than 400 and probably more than 500. Descriptions of some particularly interesting new species from this series have been included in the systematic account of the Challenger Radiolaria. A complete critical investigation of the Radiolaria of Barbados, and especially an accurate comparison of these Cainozoic species with the Mesozoic forms from the Jura, on the one hand, and with recent types on the other, must be left to the future for its accomplishment (see § 246).