426 CRUSTACEA. 



PORCELLANA ARMATA. 



Carapax Icevis, subgranidosus, non areolatus, pernio convexus, oblongus, 

 lateribus prope medium trispinosus et pone unguium post-orbitalem 

 unispinosus, fronte 1-dentatus. 



Carapax smooth, subgranulous, not at all areolate, little convex, some- 

 what oblong; sides of carapax having three acute spines near 

 middle and one just behind post-orbital angle ; front seven-toothed. 



Plate 26, fig. 14, carapax, enlarged four diameters. 



Mangsi Island, Balabac Passage, north of Borneo. 



Length of carapax, two and one-fourth lines ; breadth, two lines. 

 The specimen is much mutilated in its limbs; yet, its distinctive cha- 

 racters are well pronounced in the carapax. The middle tooth of the 

 front is also mutilated ; of the others, the pair next to the medial 

 tooth is broader and subacute ; the other two are spiniform and acute, 

 one of the spines being at the margin of the orbit, and the other more 

 interior. The upper margin of the orbit is thin, and somewhat 

 reflexed; its outline excavate. The tooth behind it is between the 

 post-orbital angle and an indentation of the side of the carapax. The 

 posterior margin of the carapax is straight. 



Section III. ANOMOURA SUBMEDIA. 



Subtribe YI. LITHODEA. 



The tribe Lithodea contains three genera, Lithodes, Latreille ; Lomis, 

 Edwards ; and Echinocerus, White. 



