66 



ON THE BRACIIYUROUS DECAPODS OF THE CAPE. 



by me instead of Pachysoma. It distinguishes a groupe which is the most quadrilateral form 

 of the family Grapsidce, and easily known from the true Grapsus by its sides deflexed verti- 

 cally, being parallel to each other from the eyes. In the Cape species the clypeus has four 

 lobes, the two middle ones being separated by a deep furrow. 



Sub-genus. Plagusia, Lat. 



Sp. 23. ( ) Plagusia tomentosa, M.B. 



Plagusia tomentosa, M. E. Hist. Nat. des Crust, vol. ii. p. 92. 



Note. In the younger specimens of this species the feet are wholly tomentose ; but in the more 

 adult specimens we "find the two ridges of the upper side of the second joints of the feet appear- 

 ing white, from the tomentum being worn off. 



Sp. 24. ( ) Plagtisia spinosa, n. s. 



Descr. Plagusia testa subtomentosa valde depressa, longlore quam lata, lateribus arcuatis antice 

 quadridentatis, clypeo medio angusto quadridentato dentibus mediis porrectioribus, clypei 

 lateribus bidentatis, manibus brevissimis gracilibus, pedibus articulis secundis extus spinosis^ 

 pari secundo longiore. 



The length of this Plagusia is about three quarters of an inch. It comes very near to the 

 Plagusia clavimana of Desmarest. 



Sub-genus. Goniopsis, Dehaan. 



Sp. 25. ( ) Goniopsis strigosa, Herhst. 



Cancer strigosus, Herbst. tab. 47. fig. 7. 



Sp. 26. ( ) Goniopsis flavipes, n. s. 



Descr. Goniopsis test^ glaberrima nitida nigrolivida lateribus antice bidentatis, epistomate 

 brevissimo crista utrinque transversa tuberculata, manibus sanguineis bicarinatis, pedibus 

 flavis nitidissimis. 



Note. This species is nearly three inches long, and very handsome. The manners of the vari- 

 ous species of Goniopsis are very interesting. There are no crabs more active, more vigilant, or 

 more beautiful. The type of this genus is the Grapsus ruricola of Degeer, a crab whose 

 manners are detailed by me in the first volume of the Transactions of the Zoological Society. 

 The name, Grapsus ruricola, Deg., was wrongly altered from my manuscript by some person 

 who superintended the press during my absence at the Havana, and changed the name to 

 Gegarcinus ruricola, Desm. The Grapsus ruricola, Deg., is the Grapsus cruentatus of Latreille, 

 and the true Crabe des Paletuviers of French travellers, although Milne Edwards erroneously 

 makes this to be the Goniopsis picta, a species which on the contrary is always found on reefs, 

 and which is therefore by Parra called " Cangrejo de Arrecife." 



Sub-genus. Nautilograpsus, M. E. 



Sp. 27. ( ) Nautilograpsus major, n. s. 



Descr. Nautilograpsus testa depressiuscula longiore quam lata, antice Isevi, lateribus postice 

 rugis transversis, raargine antico pone oculos subemarginato, clypeo lato ultra laterum angulos 

 porrecto. 



Note. This species is ten lines long by seven wide ; whereas the true Nautilograpsus minutus, 



