. Bulletins of American paleontology. . Text-fig. 12. — Septal sutures and cross section of PscuJoIissoceras zitteli (Burckhardt). A. Macroconch [9], McM - J 1506/387, at H = mm. B. Microconch [5], McM - J 1516/10, at H = mm. C. Macroconch [9], McM - J 1509/333, E/L saddle. However this suture has begun to approximate indi- cating end of growth. In the largest specimen (McM - J 1509/333) with phragmocone diameter of 62 mm (H = 25 mm), egression of the whorls has already begun one-half whorl before the end. The apparent microconch ( (5 ) is much smaller than the macro- conch (D P
. Bulletins of American paleontology. . Text-fig. 12. — Septal sutures and cross section of PscuJoIissoceras zitteli (Burckhardt). A. Macroconch [9], McM - J 1506/387, at H = mm. B. Microconch [5], McM - J 1516/10, at H = mm. C. Macroconch [9], McM - J 1509/333, E/L saddle. However this suture has begun to approximate indi- cating end of growth. In the largest specimen (McM - J 1509/333) with phragmocone diameter of 62 mm (H = 25 mm), egression of the whorls has already begun one-half whorl before the end. The apparent microconch ( (5 ) is much smaller than the macro- conch (D Phragmocone ^ 18 mm) but has similar whorl shape and coiling (Text-fig. 13). The flanks are weakly convex and the venter narrowly rounded. Adulthood is indicated by septal approxi- mation and egression of the body chamber. The septal suture (Text- fig. 12B) differs slightly in the somewhat higher E/L 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: 1065px × 2347px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorpaleontologicalresearchinstitutionit, bookcentury1900
