What We Do Citizen Science Great Eggcase Hunt British Isles & NW Europe SMALLSPOTTED CATSHARK (Scyliorhinus canicula) Size: Maximum Eggcase Length: ~5cm (ranges from 3–8cm) Maximum Eggcase Width (with keels): ~2cm (ranges from 1.5–3cm) Range: Known throughout the Northeast Atlantic from Norway to West coast of Africa, and in the Mediterranean Sea. This is one of the most abundant shark species in British waters and as it's a coastal species, it's often encountered by divers and snorkellers. Similar Eggcase: Similar shape to the Nursehound eggcase, but is much smaller in size. Great Eggcase Hunt Records: Empty eggcases are frequently washed ashore and have been reported from around the majority of the British coastline. They're often found in very large numbers.