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Lychnocanium grande Campbell and Clark, 1944

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Shell large; apical horn short (less than 0.1 length of foot), rodlike, subvertical, distally sharp; cephalis broadly conical (60°), its length about same as apical horn, its basal diameter (shell-neck) 1.4 its own length, and its sides very strongly convex, forming a poited apex from wich horn arises; thorax as a hole subconical (50°) its length abou 0.5 that of foot, its lower diameter approximately at level of origin of feet 0.58 maximum in diameter, and latter 0.9 length of foot; wide open mouth has a circular, transverse rib, and a flat plate of pore-bearing shell material surrounds it, a continuation from sides of thorax, lateral walls of wich are pronouncedly convex; from wide level of shell just above flat, oral plate arise three divergent, nearly straight, three-bladed, apically sharp, basally thick feet; wall of cephalis thinner than that of thorax; surface generally smooth but with vertical, very short, branched, twiglike spines around shell at level of origin of feet; wall of cephalis large, shallow, subcircular, uniform and with a narrow, basketlike framework, pores of thorax mostly subcircular to elliptical, exeptionally otherwise, 9-10 in a vertical tier and graded in size from largest near lower sides to smallest near shell-neck, about 44 or more around circumferences in row near level of origin of feet and fewer above, feet and horn hyaline. Length, total, 250 µ, of horn, 15 µ, of feet, 150 µ; in diameter of maximum, 170, of aperture, 50 µ, of thoracic pores, about 15.4 µ.
Lychnocanium grande n. sp. sigmopodium (Haeckel, 1887) most closely but has a shorter horn, less distinct and smaller cephalis, less-pronounced cervical stricture, larger pores, and shorter legs. It does not fesemble closely favosum (Haeckel, 1887) and forticeps (Haeckel, 1887) species, wich, however, are related to it.
Campbell and Clark 1944











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