MONOGRAPH 



or THE 



FOSSIL MALACOSTRACOUS CRUSTACEA 



OF 



GREAT BRITAIN. 



PART II. — Of those found in the Greensand and Gaut.t. 



OKDm,—BRACHYUBA. 



Family— MAIADJ3. 



Genus — Mithracites, Gould. 



Char. Gen. lesta suborbicularis, antice aeque arcuata, vix longior quam latior, regioni- 

 bus distinctis ; rostro seque longo ac lato, antice obtuse triangulari ; orbitce transversim 

 suboblongse ; oculori/m peduncula ad latera rostri inserta. 



Mithracites vectensis, Gould. Plate I, figs. 2, 3. 



Descr. The carapace is suborbicular, of nearly equal length and breadth, including the 

 rostrum ; the anterior portion almost evenly arcuate, the latero-posterior margin somewhat 

 bulging; the rostrum very distinct, projecting, of equal length and breadth, grooved in the 

 middle, terminating in an obtuse triangle, with the anterior edge a little raised ; the regions 

 mostly distinct, and somewhat tumid, the nuchal and hepatico- branchial sulci rather deep; 

 the whole surface minutely tuberculated, and having large, distinct tubercles on the different 

 lobes of each region ; of these there are about five on the median line and seven on each 

 side, viz., one on each epigastric lobe immediately behind the rostrum, one on the meso- 

 gastric, one on the hepatic region, and four on the branchial. 



Length and breadth of the carapace, 0*6 inch. 



1 



