Ascidia virginea, part of the brachial sac, from inside, magnified.

Licence: 
Creative Commons Licence
Creator: 
Muller, 1776
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith