Measuring 2 and 7 mm in length alive, the two animals found were creamy white in colour. The mantle surface is smooth with minute spiculesprojecting and scattered small white spots which probably mark the position of glands. The pinkish viscera can be seen through the semi-translucent mantle. There are nine cream coloured glands on each side on the 7 mmanimal; with five on one side, six on the other of the 2 mm specimen. Cadlina dubia is very similar to Cadlina rumia but differs in the thicker, more opaque mantle without papillae and broader foot.