Spider Web Stitch (Diagram 1):
Bring the needle up at A,  move down over one canvas thread and to the left over three canvas threads, bring the needle down at B. Bring the needle up at C, move down over three canvas threads, bring the needle down at B. Bring the needle up at D, move down over one canvas thread and to the right over three canvas threads, bring the needle down at B. Bring the needle up at E, move up over two canvas threads and to the right over two canvas threads, bring the needle down at B. Bring the needle up at F, move up over two canvas threads and to the left over two canvas threads, bring the needle down at B. This completes the base of the spider web stitch.
Now we start the web part of the stitch. Bring the needle up at B. You will now proceed to work the yarn over and under the existing base stitches. You may pack as many "circles" into the web as you choose - or can fit. Experiment to see what looks best...