On the Trigoniinae

In this paper, the writer discussed the classification and the complicated phyletic relationships of the Trigoniinae and described and listed a number of genera and species. Pseudomyophorella nov. is one of the most aberrant and interesting Trigoniids, and may be an off-shoot, belonging to a new sub-family, derived from Trigonia by the development of the diagonal and tuberculate costation on the flank.