CRUSTACEA — WHITELEGOE. 



221 



narrowed posteriorly. Third subeciual to the second in length, 

 but wider behind than in front. Fourth and fifth subeijual, 

 broader and longer than 

 those preceding or following ; 

 seventh broader than long, 

 narrower than the sixth. 



Upper surfaces of peraeon 

 segments slightly convex 

 from side to side ; each dorso- 

 lateral margin has a very- 

 faint and somewhat indistinct 

 line; the cephalon is de- 

 pressed and also exhibits 

 iaint marginal lines. Inferior 

 surface of first segment 

 acutely keeled; the under sur- 

 faces of the succeeding seg- 

 ments are smooth, convex 

 and without distinctive 

 marks. 



Pleon one-tifth narrower 

 than the last segment of the 

 peraeon and three - tenths 

 longer than broad with the 

 telson. 



First segment as long as the 

 second and third combined ; second 

 to sixth segments subequal in length. 

 Sides of each segment adherent and 

 indistinctly defined. 



First antennte having the basal 

 joint twice as long as broad and 

 longer than the second and third 

 •combined : third joint nearly twice 

 as long as the second but narrower ; 

 flagellum with five articulations, the 

 first and last very short, the three 

 intervening subequal and tapering ; 

 «ach joint bears a few short setee and 

 the apex two or three long ones. 



Second antennae very stout, some- 

 Avhat longer than the first; basal 

 joint short, slightly constricted in 

 the middle, second joint about two- first Lkg. 



fifths longer than broad, third and ^ig. 186. 



fourth subequal, fifth longer than broad, sixth narrow, tapering, as 

 long as the fourth and terminating in a dense tuft of short setse. 



Cephalon and Antens/E. 

 Fig. 18a. 



