1. Onchidoris bilamellata. Spawn masses, resemble everted, high, white collars. Adult on left. Low water spring tide, Mersey Estuary. Late January 2010.
2. Onchidoris bilamellata. Spawn masses, resemble everted, high, white collars. Adult on left. Low water spring tide, Mersey Estuary. Late January 2010.

Onchidoris bilamellata. Spawn masses, resemble everted, high, white collars. Adult on left. Low water spring tide, Mersey Estuary. Late January 2010.