The new genus, Liothyrella, has recently been created by Dr. J. Allan Thomson for the reception of a series of recent and fossil Terebratulids commonly ascribed to the genus Liothyrina. The chief characters upon which the genus is founded are the presence of fine radial ribbing on the surface of the shells and the possession of a short, low, thin, mesial septum in the dorsal valve. In the thickness of the shell, Liothyrella is said to stand between Liothyrina (genotype L. vitrea) and Terebratula, sensu str., all three genera being finely punctate. Thomson takes the; recent Magellanic species L. uva (Brod.) as the genotype of Liothyrella, and includes in the same genus L. uva, var. notorcadensis, Jackson, from Scotia Bay, South Orkneys, and a new species dredged off Tasmania by the Mawson Expedition, as well as two Australian Tertiary species, Terebratula tateana, Tenison-Woods, and T. concentrica (Hutton). He remarks that “probably also many of the other southern species ascribed to Liothyrina will be included here, but the descriptions do not state whether or not a mesial septum is present” (op. cit., p. 44).