List of Species and Varietes.
Sub-order, Imperforata. Fam. Miliolida.
Fig. 1, 2. Miliola seminulum, var. (Biloculina) ringins, Linne.
In England the Foraminifera are being arranged all under different types. Thus of the Miliola, 2 seminulum is the type. The variety follows, preceeded by its sub-generic title as above.)
This variety is very widely distributed; it is found common and large in the Arctic Ocean (off Norway), at at from 30 to 160 fathoms. In North Atlantic, rare on marginal plateau. British: off the Shetlands, rare in 120 fathoms. Very rare in River Dee. Common in Tasmanian and Australian seas. Fossil in Boulder clays of Cheshire (drift). Miocene, Yarra Yarra, Victoria. The specimens from the material, are the largest and finest that I ever saw.
Figs. 3, 4. M. seminulum, var. B. ringens, sub. var. elongata, D'Orb.
Much smaller here than the B. ringens, it is more elongate and less globose in form; it is simply a sub-variety of variety ringens, and cannot be really called a species. Rare and small in North Atlantic, in 1450, 1950, 2050 fathoms. British: River Dee, frequent. Fossil: Boulder clays, Cheshire; Yarra Yarra, Victoria.
Figs. 5, 6, 7. M. seminulam, var. (Quinqueloculina) triangularis. D. Orb.
This is a triangular form of the type which takes its place in some localities. Here the type is not found, but is represented as above. Very rare and small in North Atlantic at various depths. Fossil in Miocene as before. Recent also in Mediterranean, Tasmanian seas, Indian Occean, etc. Is very rarely recorded as a distinct variety, generally classed under the typical name, Seminulum. Here it is rather common in various sizes.
Fig. 8. M. seminulum, var. (spiroloculina) planulata. Lamarck.
This differs in some respects from the forms called “planulata” by authorities, but I know of no other name for it. It is large, flat, much
worn, irregularly striated, and rare. I may have to call it by a different name. Recent in Atlantic, Arctic, British Seas; fossil in London clay, Sheppey.