Sketch diagrams of four types (Type 1 to 4) of specimens assigned to Hildoglochiceras kobelliforme (Bonarelli) (m) and kobelli (Oppel) (M). Type 1 – with large umbilicus, compressed whorl section and acute venter (m). Type 2 – with small umbilicus and compressed whorl-section with acute venter (M). Type 3 – small-sized specimens, juvenile of types 1 & 2. Type 4 – are same as Type 2 but with preserved crescentic ribs on flanks.