Slide showing a diagrammatical drawing of a 'group of tubes of Serpula Vermiculars'. Slide shows a diagrammatical drawing of a 'group of tubes of Serpula Vermiculars'. The drawing has explanatory labels, which are as follows: 'Fig. 183. - A group of tubes of Serpula Vermiculars L., from the mouths of two of which the animals are protruding, that on the right being seen from above. br, the gill plume; m, thoracic membrane; op, operculum; op1, corresponding gill filament of the opposite side; t, tube. (from Cuvier's Regne Animal.) Nat. Size.' Late 19th to early 20th century