In the Biilletin series, the first of which was issued in 1875, appear longer, separate publications consisting of monographs (occasionally in several parts) and volumes in which are collected works on related subjects. Bulletins are either octavo or quarto in size, depending on the needs of the presentation.

Recent extensive collections of freshwater sponges in Australia are subjected to a detailed taxonomic study. Of the 24 species now recorded, five new species are fully described and figured, and the taxonomic criteria of three hitherto rather dubious spongillids redescribed and illustrated. Full keys to the gemmule-producing genera of Spongillidae, and to the Australian species, are included. The environment and zoogeographical distribution of Australian spongillids are discussed.

The taxonomy of the subfamily Penaeinae has been revised and coordinated with the latest results of overseas workers, following chiefly Burkenroad's systematic groupings. A key to groups, genera, and species is given for Penaeinae occurring in Australian waters and the adjacent part of the Indo-Pacific region, with special reference to those on the east coast of Australia. Sixteen species occurring in commercial catches off New South Wales and southern Queensland are fully described, and 11 illustrated.