. The Annals and magazine of natural history; zoology, botany, and geology. 402 On '^ Orthoceras [Endoceras] ; the diameters being as 24 : 19. Very uniformly tapering at the rate of 1 in 6. Septa direct, undulating; distant about ^ th'C diameter. Siphuncle eccentric, cylindrical, its diameter about I the longer diameter of the shell. Body-chamber and test unknown. Hematics. The distinguishing feature of this species (fig. 3) is its relatively high rate of tapering. Horizon. Ori/^oceras-Limestone (=Arenig-Llanvirn). Locality. Reval (Esthoniaj, Russia. Fio'. Orthoceras revahnse.—

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. The Annals and magazine of natural history; zoology, botany, and geology. 402 On '^ Orthoceras [Endoceras] ; the diameters being as 24 : 19. Very uniformly tapering at the rate of 1 in 6. Septa direct, undulating; distant about ^ th'C diameter. Siphuncle eccentric, cylindrical, its diameter about I the longer diameter of the shell. Body-chamber and test unknown. Hematics. The distinguishing feature of this species (fig. 3) is its relatively high rate of tapering. Horizon. Ori/^oceras-Limestone (=Arenig-Llanvirn). Locality. Reval (Esthoniaj, Russia. Fio'. Orthoceras revahnse.—a, part of a specimen, the whole of which measures 71 inches (s, siphuncle) ; b, section, showing siphuncle at s. Natu- ral 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 London, Taylor and Francis, Ltd

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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1887