Like other limpets and some sea snails that graze rock surfaces, P. pellucida has a long, powerful radula, but it is shorter than most, requiring only a single fold to fit it inside the body (1).
Food material passes along the long coiled intestine (2) which is usually white like the consumed white inner parts of Laminaria.
Faecal boluses pass through the rectum (3) and are compressed and bound with mucus
Faecal rods emerge from the anus (4) at the rear right of the nuchal cavity and are conveyed to, and expelled from, the right anterior of the shell by cilia and the flow of exhalant water.
The gonads are situated between the viscera and foot but, during the breeding season, they spread (5) over much of the viscera.
Concise
Part 1, SHELL FORMS: 02 Patella pellucida. Growth Stage 2 (GS2). July 2012. Littoral. North Yorkshire, England. © P. Lightfoot.
Part 2, BODY & ANATOMY: 03 Patella pellucida. Growth Stage 3 (GS3). 2009. Sublittoral, Farne Islands, Northumberland, England. © P.Lightfoot.
Part, 3 HABITS & ECOLOGY: 04 Patella pellucida. Length 4.6mm. Growth Stage 3 (GS3). September 2016. Yorkshire, England. © P.Lightfoot.