HOPLOPARIA. 29 



surface somewhat scabrous ; the nuchal furrow is open, but not deep. There is in the British 

 Museum a specimen of an anterior leg (fig. 7), which, from a comparison with the fragment 

 connected with the carapace (fig. 4), I am induced to consider as belonging to this species, 

 although with some degree of doubt. It is of moderate length, the arm about as long as the 

 hand and wrist together, or half as long again as the hand ; it is of a triquetrous figure, and 

 each angle is armed with irregular double or triple rows of tubercles ; the wrist has several 

 smaller ones j it is about half as long as the hand, or one third that of the arm ; the hand, 

 about twice as long as it is broad, has three or four strong spines at its proximal extremity ; 

 the outer side is smooth, the inner tuberculated ; the fingers are wanting in the only 

 specimen of this part I have seen, which evidently belonged to an individual of com- 

 paratively small size. 



Length of the carapace about 4 inches, breadth 2 inches. 



Found in the Gault at Folkestone, and in the upper Greensand of Cambridge and 

 Wiltshire. There are three specimens in the British Museum from the former locality, two 

 of the imperfect carapace, the third of the anterior leg above described, and there are 

 numerous specimens from Cambridge in Mr. Carter's collection, and one in Mr. 

 Cunnington's, from Wiltshire. 



Obs. This is by far the largest species of the genus, if we may judge by the length 

 and breadth of the carapace. Notwithstanding the fragmentary state of the specimens 

 at present known — the whole of the anterior part of the carapace and the abdomen 

 being absent — the form of the nuchal furrow and the general character of the carapace and 

 of the leg dearly fix the genus to which the species belongs. 



Hoploparia Saxbyi, M*Coy. Plate VIII. 



Testa granulosa, regione gastrica scabra ; carinis quatuor leviter tuberculatis, quarum 

 utrinque una super marginem rostri producta ; rostro late sulcato ; manibus inequalibus, 

 valde compressis, tuberculatis. 



Hoplopakia Saxbyi, M'Coy. Ann. Nat. Hist., 1854; Cont. Brit. Pal., p. 266 

 cum fig. 



Descr. Carapace semicylindrical, roughly granulated, the anterior portion tubercu- 

 lated and scabrous ; there are two pairs of slightly tuberculated, converging carinas, the 

 inner two extending to the margins of the rostrum, becoming more elevated forwards, so 

 as to produce a broad and deep sulcus through its entire length ; a slight elevation arises 

 from the posterior part of the hollow ; the supra-orbital ridges are large and prominent, 

 armed with a strong spine, and terminating in a long, slender, supra-orbital process; the 



