. Bulletins of American paleontology. Alaskan ammonites, Pt. II: Westermann 135. Text-fig. 44. — Cross-section of Docidoceras (Docidoceras) sp. aff. D. longal'vum (Vacek), complete speci- men with strong umbolateral groove on last phragmocone whorl and body chamber, loc. WA 10 in the lower Pseudocidoceras zonule (McM J 937) ; X 1. The ultimate one-quarter whorl of the phragmocone and espe- cially the body chamber fragment have on right and left innermost flanks (umbilical slopes) strong and well-defined grooves [here named umbolateral groove]. On the phragmocone these are largely filled with &
. Bulletins of American paleontology. Alaskan ammonites, Pt. II: Westermann 135. Text-fig. 44. — Cross-section of Docidoceras (Docidoceras) sp. aff. D. longal'vum (Vacek), complete speci- men with strong umbolateral groove on last phragmocone whorl and body chamber, loc. WA 10 in the lower Pseudocidoceras zonule (McM J 937) ; X 1. The ultimate one-quarter whorl of the phragmocone and espe- cially the body chamber fragment have on right and left innermost flanks (umbilical slopes) strong and well-defined grooves [here named umbolateral groove]. On the phragmocone these are largely filled with "porous material" which is believed to represent secon- dary secretion, possibly originally rich in organic material, for at- tachment of the paired retractor muscle (see also Jordan, 1968). On the body chamber, the giooves correspond to all of the inner flanks and are bordered by a sharp mid-lateral edge (on the left side apparently raised by fracture) (Text-fig. 44) . The septum is typically bullate with slightly stronger outer than inner saddle axes. The suture is of moderate complexity with suspensive umbilical 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. ]
Size: 1080px × 2314px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorpaleontologicalresearchinstitutionit, bookcentury1900
