CYCLOPOIDEA. ^97 



red. Last three joints of cephalothorax two-fifths of the whole in 

 length. Abdomen six-jointed; articulation between the second and 

 third segments less distinct than the others ; last joint rather the longest 

 and rounded. Anterior antennae seven- or eight-jointed; third joint 

 with a few short setae near the centre of front margin as well as at 

 apex. The setae of the appendages to base of abdomen extend all 

 nearly to the last joint of abdomen. The caudal stylets are longer 

 than half the body. 



This species is rather stouter than the following, and is peculiar in 

 having stout basal joints to the antennae, which organs are otherwise 

 very slender. 



Figures 11, lrn, represent the young of Setellse. The first was 

 caught on the same day with the Setella above described, and it is 

 probably the same species. The second was met with a few days after 

 (the 26th of October, in latitude 4° 15' north, longitude 19° 30' west), 

 and may possibly be a still younger state of this animal, or else the young 

 of another species. The former was one-thirtieth of an inch long (in- 

 cluding caudal setae) and had a faint orange tinge ; the latter was 

 one-twenty-fourth of an inch in length, and was nearly colourless. 



Setella longicauda. 



Maris (?) : — Antennce anticce ad basin non crassiores, 7 aut ^-articulator ; 

 articulo quarto paululum arcuato (posticd convexo) et cum appendice 

 instructo, tertio fere duplo longiore quam quartus aut secundus. Ra- 

 mus major pedis biremis antici 3-a?*iicidatus, articulo primo valde 

 brevissimo. Pedum abdominis ramus exterior brevissimd setiger, inte- 

 rior duabus setis spinulosis instruct us 9 apicem abdominis fere attingens. 

 Setce caudales corpwe largd duplo longiores. 



Male (?) : — Anterior antennae not stouter at base, seven- or eight-jointed, 

 fourth joint a little arcuate (convex behind) and bearing an appen- 

 dage, the third nearly twice as long as fourth or second ; longer 

 branch of second pair of feet three-jointed, the first joint very short; 

 outer branch of abdominal feet bearing very short setae, the inner 

 with two long spinulous setae, which extend nearly to apex of abdo- 

 men. Caudal setae full twice as long as body. 



300 



