% HISTIUNOTUS ANGULARIS. 



bnnchioetegal rays. i. op. inter-operculum. op. operculum. 

 p. cl. post-clavicular plates, p. op. pre-operculum. s. op. sub- 

 operculum. 



The specimen from which the above description is taken, and 

 which is figured in the accompanying plate, was procured by me 

 from a quarry at Herston, near Swanage, Middle Purbecks. It is 

 now preserved in the Dorset County Museum, Dorchester. 



