How do I suppress the counter for figures?

Question

I am including some illustrations in the figure environment so that they float properly and so I can caption them, but I don't want the counter. Is there a way to suppress this?

\documentclass{memoir}

\usepackage[demo]{graphicx}
\usepackage{float}

\newfloat{illustration}{thp}{lop}

\begin{document}

\begin{illustration}
\begin{center}
\includegraphics[width=3.5in,height=5in]{image001}
\caption{{\large \textbf{Caption}}}
\end{center}
\end{illustration}

\end{document}

Answer 1

The whole answer refers the documentation of memoir:

CTAN memoir

You are using memoir. memoir provides also the command \newfloat So you don't need the package newfloat. See section 10.1 NEW FLOAT ENVIRONMENTS

What you want is called by memoir legend. So the command \legend helps you.

In the documentation you can find:

The \legend command is intended to be used to put an anonymous caption, or legend into a float environment, but may be used anywhere.

Answer 2

You could load the caption package and use the starred version \caption*. (The package is also useful for formatting the caption.)

\documentclass{memoir}

\usepackage[demo]{graphicx}
\usepackage{float}

\newfloat{illustration}{thp}{lop}

\usepackage[font={large,bf}]{caption}

\begin{document}

\begin{illustration}
\begin{center}
\includegraphics[width=3.5in,height=5in]{image001}
\caption*{Caption}
\end{center}
\end{illustration}

\end{document}