How to loop for posts only with certain taxonomy?

I have a CPT “classes” with a taxonomy “series”. I am trying to use your plugin (thanks for it!) to only show classes with a series of “My New Series”. I have tried you examples and can’t seem to properly code the certain taxonomy.

This, displays nothing:

<ul>
    <?php foreach (get_the_terms(('series'), 'My New Series') as $cat) : ?>
    <li>
        <img class="img-responsive" src="<?php echo z_taxonomy_image_url($cat->term_id); ?>" />
        <a class="fusion-no-lightbox"
            href="<?php echo get_term_link($cat->slug, 'series'); ?>"><?php echo $cat->name; ?></a>
    </li>
    <?php endforeach; ?>
</ul>

This, displays all classes (posts) with any series (tax):

<ul>
    <?php foreach (get_the_terms('series') as $cat) : ?>
    <li>
        <img class="img-responsive" src="<?php echo z_taxonomy_image_url($cat->term_id); ?>" />
        <a class="fusion-no-lightbox"
            href="<?php echo get_term_link($cat->slug, 'series'); ?>"><?php echo $cat->name; ?></a>
    </li>
    <?php endforeach; ?>
</ul>

How do i loop through posts only that have taxonomy “My New Series”?

Thanks,
Ben