BRITISH ZOOPHYTES. 271 



293), as H. flagellum, but in the A. M. N. H. for July, 

 1881, he withdraws that name and substitutes the one 

 given above. 



Mr. Hincks describes by reference merely a species, 

 E. cassiterides {Couch), which he regards as very 

 doubtful. It is included in the lists of Couch, Johnston, 

 and Landsborough. 



Genus V. Rhyngopora, Hinchs. {pixyxp^, a beak.) 



Zooecia with the primary orifice transversely elliptical, 

 lower margin slightly sinuated, secondary orifice sub- 

 orbicular, with a mucro on the lower margin, and an 

 uncinate process immediately above it, within the 

 mouth. Zoarium incrusting. — T. H. 



1. E. BispiNOSA, Johnston. Plate XXI. fig. 5. 



Lepralia bispinosa {G. J., B. L., T. H., Bush, McA.), 

 Discopora bispinosa {Gray). 



Hab. : Berwick Bay {G. J.), South Devon, Guernsey 

 {T. E.), Shetland {A. M. N.). 



This species forms lilac-coloured colonies. The cells 

 are ovate, punctured round the margin, and granulated. 

 The orifice is rounded, "within the lower margin a 

 curved hook-like process, and immediately below it a 

 tall, sharply pointed mucro.^' The upper margin of 

 the orifice is pointed, and bears two long spines. 



Sometimes there are large avicularia placed trans- 

 versely across the cells. 



The ovicels have a prominent boss on the front. 

 These characteristics vary greatly with age and situa- 

 tion, this being one of the most variable forms known. 

 Its position amongst the Myriozoidce is to a large 

 extent tentative, as its peculiar orifice allies it with the 

 Escharidce. 



