BRITISH FOSSILS, 



Cyphaspis and jEglina are for the first time published in 

 England; and a new genus, Gyphoniscus, is proposed for some 

 minute and hitherto undescribed forms. 



Bemopleurides is republished, with some additional data for the 

 correct account of its structure. It is proposed, for what appear to 

 be cogent reasons, to refer some curious variations in closely allied 

 forms to sexual differences. 



Under the ten genera here illustrated, the descriptions of all known 

 British species are given. They have in every instance been drawn 

 up by Mr. Salter. 



Edward Eorbes. 



August 1, 1853, 



