THE CRETACEOUS FORMATION. 33 



No. 6. Cytherella (?) Bosquetiana, nobis. Tab. VI, fig. 23 a — c. 



INCH. 



Length, ^-^ 



Height, Y3 Detritus, Charing. 



Thickness, ^^y 



Carapace nearly oblong, somewhat arcuated, slightly convex ; rounded anteriorly 

 almost squared posteriorly. Surface of valves roughened and finely granulated. 



Dorsal aspect narrow acute oval ; anterior ovate. 



C. Bosquetiana differs from C. truncata in being arcuated and roughened, and 

 especially in being convex centrally instead of posteriorly. 



We have met with only one specimen, a closed carapace, of this species, which 

 is named in honour of M. Bosquet, author of the elaborate and elegant memoir on the 

 Entomostraca of the Maestricht Chalk. 



