You will notice that there are a number of images in a row.
Each of these images is a sample of what is contained in this particular gallery segment.
For instance, there may be 12 images in that segement, but only three are showing.
To see a caption describing the image series, simply move your cursor over the image.
To see all the photos in a particular segment, simply click on one of the images.
You should then be able to scroll through all the images for that series.