adapical造句

• Bullettes at the adapical ends of the connecting rings are small.
• The narrow endosiphotube, left within the adapical portion, may contain diaphragms.
• The siphuncle is close to the venter and found only in the adapical portion.
• The shell is yellowish brown, with a white sutural line and many prominent white papillae along the adapical border of the whorls.
• The columellar edge forms a thick outgrowth which extends over the aperture, provided with denticles which increase in size towards the adapical side.
• Shells are generally straight, beginning with a subcircular cross section in the adapical portion but becoming faintly depressed adorally ( toward the front ).
• Shell up to 80 mm, with a moderately high columella; provided with small blunt tubercles and molded over the varix of the preceding whorl but never bearing a distinct plait or denticle on the adapical side.
• Rather thin, slightly concave diaphragms are present in the early, adapical, portion . " Weishanuceras ", which came later, also has short straight septal necks, but connecting rings are moderately thick as well as straight, and the siphuncle contains internal, ring-like deposits.
• ""'Konglungenoceras " "'is a discorid from the lower Silurian of Europe ( Norway ) included in the Cyrtogomphoceratidae that lacks the septal foramina grasping bullettes at the adapical end of the connecting rings . shells are endogastric and strongly compressed, such that the ventral or siphuncle side is curved inward and the dorso-ventral height is greater than the width.