. Bulletin of the British Museum (Natural History), Geology. I02 MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS Description. The processes are restricted to one per plate area and indicate a reflected tabulation of 3', 6", 6c, 5'", ip, i"" and 1-5S. The equatorial and sulcal processes are frequently more slender than the others. Distally the processes often have a margin bearing short bifid aculei. The length of the processes is about half the diameter of the central body. The margin of the archaeopyle is interrupted on the epitract by a short projection, the sulcal tongue (Ev
. Bulletin of the British Museum (Natural History), Geology. I02 MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS Description. The processes are restricted to one per plate area and indicate a reflected tabulation of 3', 6", 6c, 5'", ip, i"" and 1-5S. The equatorial and sulcal processes are frequently more slender than the others. Distally the processes often have a margin bearing short bifid aculei. The length of the processes is about half the diameter of the central body. The margin of the archaeopyle is interrupted on the epitract by a short projection, the sulcal tongue (Evitt). This has a correspond- ing sulcal notch on the hypotract. The number of sulcal processes varies from i to 5. In some specimens the plates readily separate, save for the three apicals which have never been observed as individual plates. H. tenuispinosum sp. nov. has only been recorded from the London Clay of England. Remarks. From the nature of the archaeopyle, the coarsely granular wall and the tabulation, H. tenuispinosum is distinct from all previously described species. Homotryblium pallidum sp. nov. PL 12, figs. 4, 6 ; Text-fig. 22 Derivation of name. Latin, pallidus, pale—with reference to the rather light colour of the central body after Fig. 22. Homoiryhlium pallidum sp. nov. A specimen from the London Clay. Internal view of the epitractal operculum ; slender acuminate ancillary processes are present. X c. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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