80 Dr. H. Woodward—Prosopon in the Clypeus- Grit. 
Subclass MALACOSTRACA. 
Order 1. PODOPHTHALMA. 
Suborder 1. BRACHYURA. 
Prosopon RicHarpsont, H. Woodward, sp. nov. (Fig. 1.) 
MP 
Fic. 2.— Outline key-figure to regions of 
carapace of Prosopon Richardsoni, H. W. 
R. rostrum; OQ. orbit; hs. hepatic spine ; 
ae ape Se. cervical furrow; S/. lateral furrow ; 
Inferior Oolite: South Cottes- MP. posterior margin; Ge. epigastric lobe; 
wolds.. From the collection of H. hepatic region; G. gastric lobe; C. 
Mr. Linsdall Richardson, F.G.S., emeae region ; Br. branchial region ; 
oH (Cie Helier Ba. epibranchial lobe. 
Fic. 1.—Prosopon Richardsoni, H. 
Woodw., sp. nov. Enlarged 23 
times nat. size. Clypeus - Grit, 
Diagnosis. —Carapace 21mm. long by 15mm. broad; frontal border 
broadly triangular, converging from the small hepatic spines (/s.) on 
the margin of the hepatic region (#.), where the width is 14mm., to 
the obtusely prominent rostrum (/.), the frontal lateral margins being 
at first slightly concave, but becoming roundly convex as they join 
the rostrum, which is curved downwards at its point and furrowed 
along its centre. The orbits (O.) are not clearly to be made out. 
The gastric lobe (G.) les in front of the cervical furrow (Sce.), 
and is 9mm. broad at its base, its sides uniting to form with the base 
a triangle, 6mm. long, terminating in a narrow acuminate point on 
the centre line of the carapace, where it merges in the rostral furrow. 
Immediately behind the gastric lobe is the cardiac region (C.), forming 
a shield-shaped escutcheon, 5mm. broad in front, and terminating 
behind in a point 6mm. from the cervical furrow on the central line 
and 5mm. from the posterior margin (J/P.); the lateral furrow (S/.) 
crosses the carapace 4mm. behind the cervical furrow (Se.) and 
nearly parallel with it, but is interrupted by the shield-shaped cardiac 
escutcheon in the centre of the carapace, which is here 13 mm. broad; 
this furrow divides the branchial region into the epibranchial (Ba.) 
in front of (S/.) and the branchial (Gr.), which les behind it. The 
carapace is rounded on its posterior-lateral border, and contracts to 
its posterior margin (J/P.), which is 7mm. in breadth and slightly 
