22 Gr- O- Sårs. 



appendages (livers), filling up the greater part of the inner 

 cavity of the head, 



The eyes (see fig. 4) are well developed and, as above 

 stated, located within the projecting frontal part of the head. 

 They are placed close together, being nearly confluent in the 

 middle, and exhibit numerous crystalline bodies, partly project- 

 ing beyond the edge of the dark pigment. At a rather con- 

 siderable distance below them, and near the tip of the rostral 

 expansion, the ocellus occurs, being rather conspicuous by its 

 glistening lateral surfaces. It is rather large, though consider- 

 ably smaller than the eyes, and, when seen laterally, exhibits 

 a triangular form. 



The antennulæ (figs 4 & 6) issue from the lower face of 

 the head, behind the rostral expansion. They are not very 

 large, but of a somewhat claviform shape, being each com- 

 posed of a small basal joint and an elongated terminal part, 

 which forms anteriorly 3 slight expansions and terminates 

 in an obtusely rounded tip. Both this and the anterior ex- 

 expansions are densely clothed with small and delicate olfac- 

 tory papulæ. 



The anteunæ (see fig, 5) are very fully developed, con- 

 stituting the chief locomotory organs of the animal. They 

 originate with a broad base from each side of the head, just 

 in front of the mandibles, and consist each of a thick, cylindric 

 basal part, or scape, and 2 long, multiarticulate rami. The 

 scape is very flexible, being divided both at the base and 

 distally into several short, imperfectly defined joints, the outer- 

 most of which are encircled in front with stiff bristles. The 

 rami are slightly unequal, the inner one being the longer. They 

 are each divided into from 10 to 12 very distinctly defined 

 articulations carrying anteriorly a number of short, spiniform 

 bristles, posteriorly, long, ciliated natatory setæ. 



The labrum (see fig. 4) is rather large and oblong in form, 

 terminating in a narrow, densely hairy lappet. 



