The scope of the sub-order Sigmatotetraxonida is here greatly enlarged by the inclusion therein of the Lithistidae and Clavulidae, and the group as now constituted is by far the largest of the tetraxonid sub-orders, being represented in the " Sealark " collection by no less than 126 species. Of this total 57 species are here described as new, 65 are identified with previously known species (in some cases as new varieties ) and 4 are identified generically only. [NOT CONTROLLED OCR]