114 COPEPODA 



by Giesbrecht (fig. 27); the pores are placed on small rounded elevations somewhat removed from the 

 margin; the Re I has no pore, the Re II has one near the base of Se and the Re III has 2, placed at 

 the base of Se 1 and Se III ; the Ri III possesses a minute pore near tip on the anterior surface. 



The pes III — /J^ have, in addition to the mentioned pore, one near the base of Se Re I; the 

 pes IV is like Giesbrecht's fig. 27, except for the somewhat different shape of the glands and the 

 different number and arrangement of the spines on the inner margin of the second basipodite. In one 

 specimen (PI. 4 fig. la) 7 triangular lamellae were observed, decreasing in size distally and posteriorly; 

 the seventh is placed on the hinder surface; in addition to these, 3 quite rudimentary teeth were found; 

 in no specimen was the number of spines greater, in several it was smaller, and sometimes almost com- 

 pletely like Giesbrecht's fig.; the arrangement is not always symmetrical. 



The area behind the rostrum is almost straight; separated from this by a transverse groove 

 the labrum proper, which consists of a convex anterior portion by a shallow groove, separated from 

 the projecting free hinder margin adorned with two series of bristles; no bristles were observed in 

 front of the free margin. 



The oral surface (PI. IV fig. i b) shows a very characteristic structure. In front of the first central 

 circular spot is a transverse row of minute granules; behind the spot I a transversely placed group of 

 spinules is found, probably formed by the fused yfrj/ groups of the longitudinal series. The second group 

 is, as shown in figure, assymmetrical, and seems partly to be fused with the lateral group; it consists of a 

 number of acicules and bristles. The tliird group consists of about ten fairly long setae, and is fairl)- 

 well separated from the following group, \\\^ foitrth one, with 15 comparatively short setae. This group 

 is almost completely fused with the Jiftlt one ; laterally to these two groups a longitudinal series of about 

 20 setae is found. Behind the central spot Nr. 3 a rather irregular transverse group of spinules is observed, 

 and behind the spot Nr. 4 a transverse row of more delicate spinules is found. 



The lamina labia lis is granular, and has a concave posterior margin (fig. ic); the area in front as 

 well as that behind the lamina has as seen in figure a fairly interesting structure. The lateral series 

 of setae behind and upon the labial lobes show as seen in fig. i d an arrangement which is distinctly 

 different from that of Gaidius, as the two first series and partly the third are represented by four 

 areas of spinules. 



J". Size of specimen from Ingolf St. 47 was 2-99 mm.; anterior division 2"i8 mm.; urosome o-8i 

 mm. CI eve's specimen measured 2-58 mm. 



The body is comparatively longer and more slender than in the female; no frontal keel is found, 

 and the rostrum is fairly long and slender (text-fig. 29 b); no trace of limitation between head and first 

 thoracic somite was found. The anterior division is 2'6 as long as the abdomen. The first abdominal 

 somite, which has the genital opening as a vertical split on the left side, is about as long as the second 

 one; this is a little longer than the third, which is again a little longer than the fourth; the striated 

 seam along the hinder margin of somites II — IV is only indicated dorsally (text-fig. 29 c). The antennulae 

 extend about to the middle of the abdomen; the segment 10 is separated by a rather indistinct line 

 from 8 — 9; the limitation between segments 12 — 13 is indistinal posteriorly. The segments 20 — 21 are 

 well separated on both sides. The measurements are very similar to those of the female, but the segments 

 beyond 18 are comparatively shorter. The differences in the appendages are as in E. viessinensis. The 



