66 
ON THE BRACE YUROUS DECAPODS OF THE CAPE. 
by me instead of Pachgsoma. 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. Plagttsia, Lat. 
Sp. 23. ( ) Plagusia tomentosa, M.E. 
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. ( ) Plagusia spinosa, n. s. 
Descr. Plagusia testa subtomentosa valde depress^., longiore 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. Goniopsi-s, Dehaan. 
Sp. 25. ( ) Goniopsis strigosa, Herlst. 
Cancer strigosus, Herbst. tab. 47. fig. 7. 
Sp. 26. ( ) Goniopsis flavipes, n. s. 
Descr. Goniopsis testa 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 arc 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 laevi, lateribus postice 
rugis transversis, margino antico pone oculos subemarginato, clypeo lato ultra laterum angulos 
porrecto. 
Note. This species is ten lines long by seven wide ; whereas the true TV autilograpsus minutus, 
