32 CARDISOMA ARMATUM. 



The Museum contains specimens of this beautiful crab 

 from Madagascar , Java and Xulla-Bessy , which agree enti- 

 rely with one another; according to Mr. Heller (Novara- 

 Reise) it occurs also at the Nicobar islands and Mr. Alph. 

 Milne Edwards has described specimens from New-Cale- 

 donia , so that it is evident that its range extends over the 

 whole Tndo-Pacific region. 



Carapace more broad than long, very convex longitudinally; 

 lateral margins defined by a distinct arched marginal line , 

 which is continued tolerably far backward beyond the very 

 small epibranchial tooth; the latter being placed at a very 

 short distance behind the external orbital angle. Branchial 

 regions rather little swollen up. Orbits large , transverse , 

 twice as broad as high, almost as broad as the front; the 

 inferior external orbital angle almost right and rounded. 

 The internal suborbital lobe that separates the external 

 antennae from the front , triangular and acuminate. The 

 first joint of the external antennae enlarged, with the 

 summit emarginate for the insertion of the other joints. 

 Lower lateral surfaces of the carapace wrinkled. Anterior 

 legs unequal , either the right or the left being larger ; the 

 hand of the larger leg scarcely as long as the width of 

 the carapace ; outer margin of the arms granulated. — 

 Upper margin of the meropodites of the ambulatory legs 

 armed with a small spine at the distal end. 



16. Car dis oma armatum, Herklots. 



Herklots , Addit. ad Faun. etc. pag. 7. 



This species is closely allied to Cardisoma carnifex Herbst 

 and may only be distinguished , except by the very cha- 

 racteristic anterior legs , by the fact that the orbits , 

 though most resembling those of carnifex, are a little 

 higher in proportion to the breadth. Carapace longitudi- 

 nally convex , branchial regions very little swollen , the 

 raised line, defining the lateral margins, very distinct. 

 The size and situation of the epibranchial tooth, the form 

 Notes from tlie Leyden IMuseum, Vol. U. 



