12 00 CRUSTACEA. 



or third short, fourth, sixth, and last twice the third in length, 

 finger of the first pair of feet about as long as half the second joint; 

 caudal setse about once and a half the length of the body. 



Plate 84, fig. 4 a, animal, enlarged ; a', profile of head ; b, anterior 

 antennae ; c, extremity of second pair of antennae ; d, first pair of feet j 

 e, abdomen, showing abdominal feet in profile. 



China Sea, northeast of Singapore, latitude 4° 20' north, longitude 

 106° 30' east; February 17, 1842. 



This species is peculiar in its comparatively stout antennae; the 

 first joint (normally first), if existing, is not seen in a back view, and 

 hence the second joint appears to be the first. The appendage to the 

 fourth joint (the third in appearance) and its setae together are 

 shorter than half the terminal portion of the antennae ; the fourth 

 joint in this species is longer than the preceding, while generally in 

 other species it is shorter. The width of the head across the eyes is 

 about equal to the width of basal joint of antennae. From the form 

 of the abdominal feet we infer that the specimen was probably a male ; 

 the outer pair had only very short setae, as in the S. longicauda; and 

 the inner has but one long seta, and this extends back nearly to apex 

 of abdomen, and is spinulose on its outer side. The articulation 

 between the fifth and sixth abdominal segments is not very distinct. 



Setella aciculus. 



Feminae : — Antennae crassiusculce, fere recth divaricatce, ad basin pau- 

 lam curvatce; articulo prirno perbrevi, secundo quartum longitudine 

 cequante et longiore quam tertii dimidium. Pedis antici digitus 

 dimidii arliculi secundi longitudine. Setw caudales sesqui corporis 

 longitudine. 



Female .—Anterior antennae rather stout, the two nearly in a straight 

 line (angle of divergence 165°), having a slight curve at base : first 

 joint very short, second as long as fourth and longer than half the 

 third. Finger of anterior feet as long as half the second joint. 

 Caudal setse one and a half times the length of the body. 



