C Y M T H I D E A. 75 J 



a little smaller than that of second, posterior leg more slender than 

 preceding, and claw smaller. Anterior antennae rather the largest, 

 eight joints, three basal largest. In the fact that the anterior epi- 

 merals are obtuse, the specimens do not agree with the description of 

 the aculeata. 



Nerocila armata. 



Corpus angustum {plus duplo longius quam latum), oblongo-ellipticum. 

 Segmenta thoracis lmum Atumqtte lateraliter breviter acuta, 3 postica 

 elongate" producta instar spinas longos et divaricatw. Epimerae totae, 

 acuta?, segmentorum 2di Stiique longos, et marginem lateralem multo 

 superantes, reliquw breves, Qtd basin 1-mm non attingente. Abdomen ob- 

 longum, segment is duobus antids lateraliter longd productis et reflexis, 

 sequentibus breviter productis, ultimo paulo oblongo, scutiformi, ad 

 basin parce latiore, apicemque obtusi-angulato. Appendices caudales 

 ultra abdomen elongatce, ramis acutis, interno fere dimidio breviore. 



Body narrow elliptical, length, considerably more than twice the 

 width. First and fourth segments of thorax with an acute tooth 

 on either side ; the fifth, sixth, and seventh prominently produced 

 into a spine, which is divaricate. Epimerals all acute, those of 

 second and third segments long, much exceeding lateral margin of 

 segments ; the others short, sixth not reaching base of seventh. 

 Abdomen oblong, two anterior segments much produced laterally, 

 and reflexed ; next three short produced ; last a little longer than 

 broad, scutiform, slightly broadest at base, obtusely angled at apex. 

 Caudal appendages elongate, extending much beyond the abdomen, 

 branches acute, inner nearly half the shorter. 



Plate 50, fig. 10a, animal; b, ventral view, enlarged; c, side view, 

 showing epimerals, enlarged three diameters ; d, stylet. 



From the body of a fish, Rio Janeiro. 



Length, one inch. Colour, whitish, or white with three longi- 

 tudinal brown or purplish-brown bands, one central and the other 

 two along the sides. The second and third segments of the thorax 



191 



