548 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 49. 



Eyes small. Flagellum of second anteima 3-segmented. Inner lobe 

 of first maxilliped aimed with two plumose processes (fig. 8). 



First thoracic segment twice as long as head, and longer than any- 

 other segment. Coxopodites not distinct. First abdominal segment 

 with lateral parts concealed; second without epimera but not con- 

 cealed; the epimera of the next three segments continuing the general 



Fig. 8.— Spaeroniscus colombiensis. o, antenna; h, head and first TiiORAac segment; to', FmsT 

 maxilla; 771', SECOND maxilla; mp, maxilliped; u, uropod. 



contour of the lateral margin. Telson broadly triangular, twice as 

 broad as long, obtuse, slightly concave on posterolateral margins. 

 Basal segments of uropoda large, square, with a notch at the medio- 

 distal angle for the exopodite, which extends downward. The internal 

 ramus of the uropoda slender, reaching about as far as outer ramus, 

 longer than basal segment. 



Color, broAvn, with paired lateral areas which contain irregular 

 yellowish-whito lines. 



