196 " THETIS " SCIENTIFIC RESULTS. 



The first antennae are 3"3 mm. in length ; the basal joint is stout, 

 compressed, and has a short process on its superior distal 

 extremity, which bears an obtuse spine ; its length without the 

 process is equal to the second joint; the third joint is two-thirds 

 the length of the second ; it is somewhat dilated distally, and 

 terminates superiorly in an acute point. 



Outer flagellum one-third shorter than the inner, consisting of 

 eleven articuli ; the basal pair are broad, long and glabrous ; the 

 first is twice as long as the second ; the third to the eighth equal 

 in length, gradually diminishing in diameter, and densely seti- 

 ferous ; ninth very narrow, elongate ; terminal pair equal in 

 length. Inner flagellum with thirteen articuli, all subequal in 

 length except the first two, which are twice as long as those 

 succeeding. 



Second antennae 2 6 mm. long, and 2*1 mm. wide; the basal 

 joint has several spines on the superior surface ; three spines 

 occur on the produced outer border, and two on the distal margin 

 — one in the middle, and the second midway between it and the 

 inner border. The second joint has two spines in a longitudinal 

 line near the inner border ; the distal margin bears three spines, 

 one on and another near to the inner angle ; the third is situated 

 at the outer angle, and marks the termination of a slightly curved 

 diagonal crest ; the outer border has two denticles— one in the 

 middle and the other in a transverse line with the inner angle. 

 Third joint small, with a ridge-like spine near its inner border. 

 The distal margin of the fourth joint is slightly ciliated, and has 

 five evenly rounded teeth, the internal one being rather narrower 

 than the rest ; the outer border is smooth, and the inner bears 

 two small denticles. 



The ischium joint of the external maxillipedes has a distinct, 

 smooth, longitudinal ridge on the inferior surface near the inner 

 border ; a similar ridge occurs in the same line on the merus ; the 

 former joint is longer than broad ; its length exceeds that of the 

 latter, and also that of the exopod ; the merus tapers rapidly 

 beyond the middle, especially on the inner border. 



Carpus as broad as long, nearly circular in outline ; its outer 

 border, distal margin and superior distal surface closely covered 

 with plumose hairs. 



Propodus shorter than the preceding joint ; its width is equal 

 to the length of the tarsus ; the latter terminates in a small 

 spinule ; a few stiff setae are scattered here and there on the inner 

 borders of the last two joints. 



The anterior legs are stout, and much shorter than those 

 succeeding ; the propodal joint varies greatly in length ; in the 

 first leg it is shorter than the tarsus, in the second the two joints 



