OF THE COASTS OF SOUTH AMERICA. 45 
Oculi retractiles, globosi, pedunculo crassiores. 
Antenne interiores in basin rostri inserte. 
Antenne exteriores rostro haud multd longiores, articulo basilari longissimo, ad medium 
rostri attinente, extiis uni-denticulato ; articulis secundo et tertio cylindricis ; re- 
liquis setaceis gracilibus. 
Pedipalpi externi caule externo semifusiformi ; caulis interni articulo primo elongato- 
rhomboideo, secundo trapezoideo, margine integro. 
Pedum par anticum reliquis paulld crassius, secundo brevius; digitis apicem versus 
serrulatis, digito immobili ad medium excavato, tuberculum unicum digiti mobilis 
recipiente : paria quatuor posteriora gracilia, compressa, pilosa. 
Abdomen Manis 7-articulatum. 
Amongst the Crustacea brought by Mr. Cuming from the western coast of South 
America, there occurs a single specimen of a very small species, which, with some 
characters allied to those of Herbstia, and some by which it is related to Pisa, offers 
certain peculiarities which appear to me to establish it as the type of a distinct genus. 
From the foregoing account of its characters, the relations which I have mentioned will 
probably be recognised ; but the structure of the anterior feet, of the exterior antenne, 
and of the pedipalps, is very peculiar. The fingers of the first pair of feet, when closed, 
are in contact throughout their whole length ; the apical half of each is minutely ser- 
rated, and there is a single tubercle about the middle of the immoveable finger, received 
into a corresponding cavity in the moveable one. This isa combination of the serrated 
with the tuberculated form of finger, which at least is not common ; and the accurate 
closing of a broad tubercle into a corresponding excavation in the other finger, isa 
structure which I have not observed in any other species. The extension of the basilar 
joint of the exterior antenne so far beyond the line of the orbit as to be exposed above 
through nearly its whole length, is also a peculiarity which I believe belongs to no other 
genus of this section. These characters, with the peculiar form of the external pedi- 
palps, appear to constitute the essential data for the foundation of a new genus. 
PELIA PULCHELLA. 
Tab. IX. Fig. 2. 
Hab. ad Insulas Gallapagos dictas. 
3 Mus. Soc. Zool. 
Carapax pyriform, gibbous, rounded, polished, somewhat hairy : the regions elevated, 
particularly the gastric and cardiac, the latter of which forms a rounded tubercle : la- 
teral margin entire. Rostrum straight, much produced, nearly half as long as the rest 
of the carapax, bifid at the extremity, with a slight groove continued backwards from 
the bifurcation. 
Internal antenne inserted at the base of the rostrum: external antenne placed at the 
