. Bulletins of American paleontology. 60 80 100 D (mm). 20 W(mm) Text-fig. 27. — Scatter and growth lines for relative umbilical width (U:D) and whorl section {H:W) of Sonniriia (Euhoploccras) bifurcata, n. sp., from the (lower) S. soivrrbyi Zone of Wide Bay; dots and solid lines for phragmo- cones, circles and dashed lines for body chambers. Note the slightly larger umbilical width of the mature whorls (60-80 mm D). Locus typicus. — Geol. Survey Mesozoic locality 12405, south sliore of Wide Bay, Alaska Peninsula. Stratum typicutn. — Shnles of upper Kialagvik Formation. Age. — Pseudocidoc
. Bulletins of American paleontology. 60 80 100 D (mm). 20 W(mm) Text-fig. 27. — Scatter and growth lines for relative umbilical width (U:D) and whorl section {H:W) of Sonniriia (Euhoploccras) bifurcata, n. sp., from the (lower) S. soivrrbyi Zone of Wide Bay; dots and solid lines for phragmo- cones, circles and dashed lines for body chambers. Note the slightly larger umbilical width of the mature whorls (60-80 mm D). Locus typicus. — Geol. Survey Mesozoic locality 12405, south sliore of Wide Bay, Alaska Peninsula. Stratum typicutn. — Shnles of upper Kialagvik Formation. Age. — Pseudocidoceras zonule of the 5. sowerbyi Zone, Bajo- cian. Other occurrences.— O. sauzei Zone of the Cook Inlet re- gion; (?) S. soiverbyi Zone of Devils Point at Lake Minnewanka in Alberta; (?) 5. sowerbyi Zone near Supplee in Oregon. Derivatio 7iominis. — The costae bifurcate commonly on the inner whorls. Diagnosis. — Large, whorls more or less compressed oval to subrectangular; phragmocone moderately to strongly evolute with lateral bullae and irregularly bifurcating ribs or with irregularly fasciculate ribs, robust on shoulders; body chamber with few strong rectiradiate or somewhat curved simple and bifurcating ribs; simple straight ribs on large body chambers. Material. — Holotype, two phragmocones with incomplete body chamber, foia- incomplete phragmocones and one fragment from. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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