Two additional South -African Phyllopoda. 15 



The caudal piece (see PI. 2, fig. 6) forms the immediate 

 continuation of the trunk, and is but slightly deflexed. Above 

 at the base, it exhibits a heel-shaped prominence carrying 

 on the tip the caudal setæ, which are rather long, finely 

 plumose, and extended upwards. In Estheria as also in 

 Limnadia and Eulimadia, several dentiform projections oc- 

 cur dorsally in front of the caudal setæ; but of such pro- 

 jections no trace is visible in the present form. The caudal 

 plates are each produced below to a strong unguiform 

 projection, and carry along their slightly concaved edge a 

 great number of minute denticles extending to about the 

 middle of the unguiform projections. The caudal claws are 

 much elongated, gently curved, and denticulated throughout 

 their concave edge. 



The eyes are wholly confluent to a single organ, ex- 

 hibiting only a slight emargination above, as an indication 

 of their original duplicity (see PI. 3, fig. 6). The ocellus is 

 only faintly traceable as a rather large triangular patch farther 

 back, at the base of the rostral projection. 



The antennulæ (see PI. 2, figs. 5 and 7), issuing from 

 the lower face of the head, just in front of the labrum, and 

 pointing obliquely downwards, are of a very delicate struc- 

 ture, consisting, as in Estheria, of a somewhat tumid basal 

 part, and a slender, flexible terminal part, more or less 

 distinctly divided into short articulations, each of which 

 expands below to a rounded lobule densely clothed with 

 small sensory papillæ. About 15 such lobules may be 

 counted, some of them being slightly bilobed at the tip > 

 In the male, these antennulæ (see PI. 3, figs. 5, 6, 7) are 

 considerably larger than in the female, but otherwise are 

 of a very similar structure. 



2 — Archiv for Math, og Naturv. B. XX. Nr. 6. 

 Trvkt den lode Marts 1898. 



