234 STALK-EYED CRUSTACEA 



6. Dilocarcinus spinifer. 



Dilocarciniis spinifer . H. Milne Edwards. 



The carapace is curved above, almost circular ; the 

 regions are well marked ; the genital and cardiac lobes 

 have small lobes anteriorly, on their anterior border. 

 The antero-lateral borders have seven very sharp teeth, 

 counting the external orbital angle. The front is wide, 

 flat, almost horizontal, feebly two-lobed. The orbits are 

 directed forwards ; the superior border is entire ; the 

 inferior has eight or ten sharp and pointed teeth. On 

 the epistome there is another row of six pointed teeth. 

 The fourth joint of the largest hand has one or two teeth 

 on its anterior border. The fifth joint has one tooth 

 on its inner border. 



Range. — Dutch Guiana. 



7. Dilocarcinus dentatus. 



Dilocarcinus dentatus . . . Randall. 

 Di/ocarcinus mu/tidentatus . Von Martens. 

 Beta crab (local name) . . . Berbice. 



The carapace is much curved from before backwards, 

 with the regions slightly marked ; antero-lateral borders 

 cut into ten teeth, counting the external orbital angle ; 

 sometimes there are nine teeth on one side and eleven on 

 the other. The teeth are flat and of about equal size, 

 with their points directed forwards ; the front is cut into 

 two slightly bent down, flat lobes, the edge of each lobe 

 having about eight small tubercles. The superior orbital 

 border has no teeth, but may be slightly notched in the 

 centre by an indistinct fissure ; the lower orbital border 

 has eight or nine rounded teeth, those on the inner side 



