Fine structure of normal and regenerated shell of Helisoma duryi duryi

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Abstract
The fine structure of the normal and the regenerated shell of Helisoma duryi duryi has been studied by transmission and scanning electron microscopy. Normal shell consists of two calcareous layers: outer prismatic and inner cross lamellar. A typical myostracal layer which shows prismatic structure is also present only at or near muscle insertions. Regenerated shell has also two calcareous layers and the myostracal layer did not appear until at or after 7 days of regeneration. Interrelationships between organic and inorganic components in both normal and regenerated shell have been dealt with by studying calcified and decalcified sections. A study of the topography of inner and outer surfaces of the normal shell shows that each surface has its characteristic surface pattern. Regenerated shell (14 days old) has the same inner and outer surface patterns. X-Ray and electron diffraction studies reveal that crystal type in both normal and regenerated shell is aragonite.

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