Slide showing a drawing of 'Amphitrite johnstoni' worm. Slide shows a drawing of 'Amphitrite johnstoni', a worm. The drawing is labelled with the letters 't' and 'g', which are explained in the key: 'Fig 175 - Amphitrite johnstoni (1/2 natural size). g, gills ; t, prostomial tentacles. (From Cunningham and Ramage).' Late 19th to early 20th century