. Bulletins of American paleontology. 448 P>UIJ,ETIX IIT) 530 and grow orad, fusing to form a continuous lining within the siphuncle. These strrictures apjjear on the venter before they appear on the dorsum, but most of the growth of tlie deposit is more comparable with t'-iat found in the Dolorthoceratina? than in the Pseudoithoceratinai (Flower, 1939), and the deposit is not completed ventrah}' before it ap];ears in t'.ie 'loi-sum as in U'cslou- oceras. These deposits show two s(jrts of structure in thin section, lamellre of growtli and rows of aragonite prisms norn^.al to the lines of gr
. Bulletins of American paleontology. 448 P>UIJ,ETIX IIT) 530 and grow orad, fusing to form a continuous lining within the siphuncle. These strrictures apjjear on the venter before they appear on the dorsum, but most of the growth of tlie deposit is more comparable with t'-iat found in the Dolorthoceratina? than in the Pseudoithoceratinai (Flower, 1939), and the deposit is not completed ventrah}' before it ap];ears in t'.ie 'loi-sum as in U'cslou- oceras. These deposits show two s(jrts of structure in thin section, lamellre of growtli and rows of aragonite prisms norn^.al to the lines of growth. Identical in fine structure is a third de- jKjsit which is often not clearlv' set off from the annulosiplionate. 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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