STALK-EYED CRUSTACEA 345 



convex, and separated from the carapace proper by a deep 

 groove which becomes continuous with the line on the 

 postero-lateral border. The anterior part of the thoracic 

 sternum has a sulcus on each side, the posterior has a 

 single median groove. 



The first pair of legs with the surface finely granular ; 

 the fourth joint is slightly hollowed out on its inner 

 aspect. The two fingers slender, exceeding the hand in 

 length, their opposed edges with numerous teeth ; the 

 apex of the fixed finger is bent over that of the movable 

 one. The walking legs are granulated and fringed 

 with long hairs ; the fourth pair flattened from above 

 downwards, with the terminal joint less strongly curved 

 than that of the others. 



The abdominal segments are moderately convex, 

 gradually tapering towards the extremity, and fringed 

 with long hairs ; the apex of the telson is rounded. 

 The vasa deferentia are protruded as short tubular out- 

 growths. 



Range. — West Indies, Brazil; in moderately deep 

 water. 



Group III. Hippidea. 



Hippidea . . De Haan, Dana, Stimpson, Miers, 



Haswell, Henderson, 

 Hippiens . . H. Milne Edwards. 

 Hippcs . . . Latreille. 



Carapace ovate or subquadrate, comparatively smooth, 

 the regions ill-defined ; the frontal margin broad. Walk- 

 ing limbs with flattened terminal joint; the last pair 

 slender and filiform, folded under the penultimate pair. 

 Abdomen semi-extended, composed of six segments (the 

 fifth and sixth fused), the penultimate with a prominent 



