Rostrum eroded, so curved rostral end on aperture. Internal vertical pores of plates exposed. Several juveniles on wall plates; when crowded, specimens grow on each other to form clumps. Mersey estuary, Wirral, England.
Rostrum eroded, so curved rostral end on aperture. Internal vertical pores of plates exposed. Several juveniles on wall plates; when crowded, specimens grow on each other to form clumps. Mersey estuary, Wirral, England.