The ostracods described in this paper have all been obtained from the Goniorhynchia boueti bed, as exposed at the little peninsula known as Herbury (“Herbeyleigh” in some of the older geological literature), near Langton Herring, some five miles to the west of Weymouth. The bed is at sea level at the north-west corner of Herbury, and is there about one foot thick. It is from this point (national grid ref. 30/610810) that the samples were taken for the separation of microfossils. Polyzoans, baby brachiopods, foraminifera, “vertebral” ossicles of ophiuroids, radicles of echinoids and minute gastropods, make up as diverse and interesting an assemblage as that formed by their better known macroscopic contemporaries.