There are two Bengal patterns. Spotted & Marbled.
Spotted: The spots should be dark & clear, with a crisp outline with a good contrast to the background colour. The spots can be either solid, arrow shaped or as rosettes. Spots should be found on the body, including the belly, the legs will have spots & or stripes. Spots should be random or horizontal in alignment.
Marbled: The marbled pattern consists of contrasting horizontal swirls along the side of the cat. The contrast must be extreme.
Jenson - Cooinda Cat Resorts February Cat of the Month
The facts presented in this Blog Post were retrieved from 'The Ultimate encyclopedia of cat breeds and cat care' by Alan Edwards, and also from the Purina website.