422 



MISS COIGNOU ON A NEW SPECIES OF CYPHASPIS. 



by the frontal border beiii^ produced into spines. It closely 

 resembles C. Bavidsoni, Barrande, and agrees with it in having:— - 



(1) Tlie frontal border produced into spines. 



(2) Two or four tubercles on the glabella. 



(3) The granulated ornamentation of the head. 



In our specimen, however, the frontal spines are longer and 

 further apart, and the granules are finer than in C. Davidsoni. 

 Further, the anterior glabeUa-furrows appear to be absent in the 

 Uohemian species. 



As it appears to be distinct from any species of Cmohaspis hitherto 

 described, we propose to name it Cypliaspis acanthina on account of 

 its thorny appearance. 



13arraude records nine species of Cyjyhaspis from Bohemia, three 

 only of whicli have the body-segments preserved, the other six 

 species being represented by heads only. 



All those with body-segments preserved have smooth borders to 

 their cephalic shields, and all have the 6th axial ring prolonged into 

 a strong median spine (see woodcut, lig. ], s). It is possible that 

 the species with spinose borders to the head-shield may belong to 

 another genus or subgenus. The pair of lobes (I) at the base of the 

 glabella are, perhaps, the best diagnostic character to rely upon in 

 dealing with detached head-shields. 



Outlines showing the Striidure of some Cephalaspides. 



Woodcuts are here given of a typical example of the genus CypJiaspis, and of 

 tliose species which are most nearly allied to the specimen under con- 

 sideration. 



Dudley, Stafford- 



EXPLANATION OF FIGURES. 



Fig. 1. Cyphaspis megalops, M'Coy. Wenloc-k Limestone 

 shire. 



9. JJavidfioni, Barr. Etage F. Mnienian, Boliemia. 



o. Cerberus, Barr. Et;:ge F. Mnienian, Bohemia. 



4. coronafa, Barr. Etage G. Moulin de Vavrovitz, Bohemia. 



5. acanthina, sp. nov. Carboniferous series ; Yorkshire. 



