CAPRELLIDEA. g]^ 



acute tooth, and above the middle usually another small acute 

 tooth. 



Plate 54, figs. 4 a, b, male, enlarged ; c, part of female ; d, hand of 

 second pair, in another specimen ; e, extremity of leg of fifth pair. 



Rio Janeiro; from among sea-weed near the fort, not far from 

 Praya Grande, abundant; also, brought up with the anchor in the 

 harbour. 



Length, about half an inch. Colour, dirty yellowish, or reddish to 

 flesh-red. Vertical width of head about equal to its length. The 

 spine on the head forms a short horizontal beak in advance of the 

 front, as in the dilatata. The first four joints of the inferior antennae 

 are about equal in length to the first three (basal portion) of superior 

 antennas. The flagellum of the superior antennae consists of ten joints 

 in the specimen figured ; but the first joint was long, and apparently 

 corresponded to three or four joints; the joints bear a few very short 

 setae. Two rows of ciliae on the inferior antennae, as usual. Ante- 

 rior hand about two-thirds as long as second pair. Superior apex of 

 basal joint of posterior feet acutely prolonged. 



The female is rather smaller than the male, and has the second 

 pair of legs proceeding from the anterior part of the second thoracic 

 segment, near the articulation. But the proportion of the head to the 

 first thoracic segment is the same very nearly in both sexes. The 

 scales forming the egg-sac are nearly quarters of a hemisphere, and 

 the form of the sac is almost hemispherical. 



The last two joints of the inferior antennae are together little longer 

 than the preceding one. 



The females were supposed by the writer to be the females of the 

 dilatata, but as there are males with like hands to the second pair 

 of legs, the species seem to be distinct. The males and females are 

 distinguished by the articulation of the second pair of legs with the 

 segment which is posterior to the middle in the males, and close to 

 the anterior extremity in the females (fig. 4 c). The males differ 

 from those of the dilatata in the tooth of the hand limiting the palm; 

 which tooth is wanting in the dilatata, though described by Kroyer 

 as characterizing the female. 



