PODOPHTHALMOUS CRUSTACEA. 55 



These rugosities are also observed on the outer surface 

 of the legs, especially on the claws of the chelipedes , 

 which are smooth in the other species. In both species the 

 legs are ornamented with equally developed crests. The 

 middle lobes of the front project more in A. frontalis de 

 H. than in Aterg. integerrimiis Lam. 



It being now very easy to distinguish these two species, 

 it will cause more difficulties to expose the differences between 

 our species and the Aterg. reticulatus de H. The innumer- 

 able rugosities on the upper surface of the carapace are 

 very distinctly reticulate in the latter species , but they are 

 arranged very irregidarly in Aterg. frontalis, and the 

 crests of the legs of the latter species are sharper than 

 in Aterg. reticulatus de H. 



Breadth of the carapace of Aterg. frontalis de H. 82 mm. 

 Length » » » 50 mm. 



3. Eury carcinus integrifrons n. sp. 



Having had no occasion to compare the description of 

 Eury carcinus {Galene) Hawahensis Dana, it is possible that 

 the new species which I am going to describe , belongs to 

 that Euryc. Hawahensis. In this case the Euryc. integrifrons 

 should disappear from science. 



Eurycarcinus integrifrons mihi is closely allied to Euryc. 

 Grandidieri Alph. M. Edw. , but it may be distinguished 

 at once by the shape of its front , of which the margin is 

 straight , entire and not incised. 



Carapace as convex as in Euryc. Grandidieri Alph. 

 M. Edw. , but comparatively not so broad as in this species. Its 

 upper surface is wholly smooth, the interregional furrows 

 are wanting entirely , and it is only by means of an ordinary 

 lens that the same very minute granules can be observed, 

 which are also found in the Zanzibar species. Latero-anterior 

 margin short, divided by three small incisions into four 

 lobes, the two anterior of which are of equal size and 



J'i'otes from ilie Leyclen IVtuseuni. 



