On The British Species Of Crisia (1891) is a scientific publication written by Sidney Frederick Harmer. The book is focused on the study of the Crisia species, which are a type of bryozoan, a group of aquatic invertebrates. The author provides a detailed description of the different species of Crisia that can be found in the British Isles, including their morphology, anatomy, and distribution. The book also includes illustrations and photographs to...