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Lamprocyclas hannai Clark and Campbell, 1944

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Calocyclas (Calocycletta) hannai n.sp. p. 48, pl. 6, fig. 21, 22

Shell rather large, stout (approximately 2.2 maximum diameters in length), generally bell shaped; apical horn stout (12°), with four equal, triangular blades fused down sides of cephalis, its tip sharp; cephalis generally conical (28°), apically angled due to triangular blades mentioned above, often asymmetrical, swollen slightly at middle and subcylindrical in lower section, its length 0.18 total length, ond cervical diameter 0.31 maximum diameter of shell; thorax broadly truncate-conical (55°), usually with fairly convex sides (sometimes reaching its maximum above its base and cylindrical basally), and thoracic margin pinched off with a transverse stricture and always marked by an internal, transverse septum; abdomen barrel-shaped, approximately 0.37 total length in length of shell, sometimes abdomen reaches its maximum diameter near middle and at other times just a little above shell aperture; shell aperture contracted (0.72 maximum diameter in diameter), its margin with discrete, projecting, spinclike, sharp denticles; wall uniform, rather thick; pores of cephalis about 50, large, circular, scattered, and well separated, of thorax larger than those of cephalis, circular, 125 or more, scattered and separated, of abdomen, larger than those of thorax, subcircular to subrectangular, sometimes in pairs of small rectangles or otherwise altered, well separated, well scattered, and about 200. Length, total, 290 м; diameter, maximum, 130 it, of largest pores, about 15.4 u. Length of abdomen ond thickness of horn variable. Calocyclas hannai n.sp. differs from amicae (Haeckel, 1S87) chiefly in shape of abdomen which is hardly subcylindrical as in that species, and in marginal denticles which arc very different in two species. Its cephalis is taller and narrower. May be related to "Anthocyrlium dornicum" Haeckel (1887) of Martin (1904) from Miocene of Maryland, a fragment of which Martin illustrates.

Clark and Campbell 1944











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