Fig. 4

Eggshell of IVPP V20184. a, outer surface of the eggshell, showing the pattern of the external ornamentation; scale bar = 5 mm; b, radial thin section of the eggshell as seen through a light microscope, showing external ornamentation and two structural layers comprising the shell; the black box encloses pathological multilayered cones, and the horizontal white bar at left indicates boundary between layers; scale bar = 0.25 mm; c, close-up photograph of pathological multilayered cones shown in b; scale bar = 0.07 mm. Abbreviations: CL, columnar layer; CN, cone layer