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In this paper, we study non-hyperelliptic curves of genus $3$ with cyclicautomorphism group of order $6$. Over an algebraically closed field $K$ ofcharacteristic $\neq 2,3$, such curves are written as plane quartics $C_r: x^3z + y^4 + r y^2 z^2 + z^4 = 0$ with one parameter $r$. As the first maintheorem, we show that $r\neq 0,\pm 2$ and give a necessary and sufficientcondition with respect to $r$ and $r'$ such that $C_r \cong C_{r'}$. Bydescribing the Hasse-Witt matrix of $C_r$ in terms of a certain Gauss'hypergeometric series, we obtain the second main theorem, where we determinethe possible $a$-number of $C_r$, and give the exact number of isomorphismclasses over $K$ of such curves attaining the possible maximal $a$-number.

The $a$-numbers of non-hyperelliptic curves of genus 3 with cyclic automorphism group of order 6