This paper is primarily a record of observations made at Trimmingbam since those recorded in a pamphlet entitled “The Stratigraphy and Fauna of the Trimmingham Chalk.” But as the Polyzoa of the Trimmingham Chalk comprise a remarkably large number of species which appear to be at present undescribed and are very characteristic of this horizon, I have taken this opportunity of describing some of the most prominent of these forms, partly in the hope of directing the attention of other collectors to their range and partly to facilitate the classification of the very large quantity of material I have accumulated. I have also taken this opportunity of giving a list of species from the Chalk between Cromer and Weybourne.