494 



CRUSTACEA. 



Pedes dntici mediocres, carpo inermi, manu paulo tumidd, supra gib- 

 bosd, digitis hiantibus, apice inflexis, acutis. Pedes 2di Ztii itique 

 subcequi, tar sis fere rectis, longis, articulo penultimo longioribus. 



Beak but little prominent. Carapax subovate, with the margin be- 

 hind the eyes somewhat salient, posteriorly unarmed. Cephalo- 

 thorax behind unarmed below. Anterior feet of medium size, 

 carpus unarmed, hand somewhat tumid, fingers gaping, tips inflexed 

 and acute. Feet of second, third, and fourth pairs subequal, tarsi 

 long and nearly straight, longer than penult joint. 



Plate 31, fig. 7 a, animal, enlarged four diameters ; b, outer maxil- 

 lipeds; c, hand; d, tarsus of third pair; e, tarsus of fifth pair; /, outer 

 antennae. 



Atlantic, in open sea, off Rio Negro, Northern Patagonia, January 

 22 and 23, 1839; also, off Valparaiso, May, 1840. 



Length of carapax, three to four lines. Colourless and hyaline, 

 with one or two green spots in the joints of the legs. Eyes, black 

 but with bright blue reflections. Second pair of legs longer than the 

 following ; tarsus edged with very short hairs. Last segment of abdo- 

 men at extremity truncated, sides rounded. 



Ctllene furciger. 



Rostrum elongatum, spiniforme, frontis latitudine non brevior. Gephalo- 

 thorax ad extremitatem posteriorem spinis duabus longis diver genti- 

 bus infra armatus. Pedes antieiangusti, carpo articuloque 2do spina 

 curvatd armatis, bracldo inermi. Tarsi 2di Stii iiique parce arcuati, 

 styliformes. 



Beak long and spiniform, longer than breadth of front. Cephalo- 

 thorax below and behind armed with two large and long diver- 

 gent spines. Anterior feet narrow, carpus and second joint armed 

 with a short curved spine, arm unarmed. Tarsi of second, third, 

 or fourth pair very sparingly arcuated, styliform. 



Plate 31, fig. 8 a, beak and front ; b, two divergent spines of pos- 



