; 
i 
E 
, 
| 
É 
3 
; 
i: 
åg 
; 
223 
the male is not visible from below, but from the side (fig. 3 b). 
Fig. 1c (Pl. IV) represents a much younger stage; fig. 1 d exhibits 
the anterior part of the same specimen with the antennulæ (a"), 
the antennæ (a?), the oral cone, etc.; figs. 1.a—1b show a very 
young specimen from above and from below, but a description of 
these stages is scarcely needed. 
Male. — The eyes are small black spots (Pl. IV, fig. 1e). 
The antennulæ (Pl. IV, fig. 1g, a!) consist of two distinct, broad 
joints, each of these with small processes. The antennæ with five 
well developed joints, the fourth about as long as the sum of the 
third and the fifth; last joint with a terminal seta. Oral cone 
rather short and very blunt. Seventh pair of thoracic legs (Pl. 
IV, figs. le and 1i) more slender than the other pairs, and 
especially the hand considerably narrower than in these (comp. 
fig. li with fig. 1h). Abdomen long, posteriorly slender, curved 
strongly downward at or before the middle, not divided into seg- 
ments, buth with a comparatively large process below and much 
nearer the end than the base; the uropods are long, well marked 
ofl, nearly sausage-shaped; the process mentioned shows consider- 
able individual variation (comp. fig. 1k with fig. 16) — Length 
(without uropods) 0-77 mm. 
(Fig. 11 on Pl. IV represents an animal in which the head 
and the two anterior thoracic segments with their appendages are 
quite as in the second larval stage, while the five other segments 
with their legs and the abdomen are developed as in a normal 
male. This seems to indicate that the head and the two anterior 
segments of the male cast off the larval skin somewhat later than 
the remainder of the body). 
Second larval Stage. — Body: (PILO; fl: ad a little 
more than three and a half times as long as broad, somewhat 
depressed. Head more than half as long again as broad, anteriorly 
broadly rounded. Eyes moderately small, somewhat transverse, 
black, with a number of small ocelli difficult to count. The sucking 
disc (Pl. V, fig. 15) of very moderate size, a little broader than 
