GRAPSOIDEA. 359 



orbit, transversely oblong, not thus reticulate. The surface of the 

 carapax is but slightly areolate. 



S. crassum, Dana, Proc. Acad. Nat. Sci. Philad., 1851, v. 251. 



Genus CYCLOGRAPSUS, Edwards. 



The genus Cyclograpsus is described by Edwards - as having a 

 ciliated crest or ridge upon the third joint of the outer maxillipeds, 

 although with the mention that some exceptions to this exist. More- 

 over, the typical species, as accepted by him, are thus characterized. 

 In dividing the genus, therefore, and separating species in which this 

 ridge exists from the others in which it is wanting, the name Cyclo- 

 grapsus if rightly employed, will be used for the former. On this 

 ground, we reject the name Gnailiochasmus of M'Leay, subsequently 

 published, which corresponds to the typical Cyclograpsi, and give a 

 new name, Hemigrapsus, to the other species, as described on a pre- 

 ceding page. Krauss refers the South African species (Gnathoclias- 

 mus harhatus of M'Leay) to the genus Sesarma.* 



The carapax in the Cyclograpsi has an entire margin, a nearly or 

 quite smooth surface, and also a curvately declivous front, the slope 

 of which is carried around a short distance beyond the orbits, and 

 diminishes laterally. The third joint of the outer maxillipeds has a 

 truncate or excavate summit, and is not always shorter than the 

 second joint, as described by Edwards. The third joint of the eight 

 posterior legs has no tooth or spine near its apex, or only a rudimen- 

 tary tooth. 



The species are found along the sea-shore, under stones washed by 

 the tides. 



Cyclograpsus Audouinii (Edwards) . 



Plate 23, fig. 2, under view of buccal area, and part of sternum 

 adjoining. 



From the Feejee Islands, or New Zealand, probably the latter. 



* Siidaf. Crust., 45. 



