‘ON ACANTHOLEBERIS. 59 
presence of sete of great length at the posterior ventral angle of 
the carapace. It differs in the fact that the sete of the first two 
joints of the lower branch of the posterior antenne are short, 
and do not vary in character from the ordinary plumose sete of 
the Daphniide. Buta more important instance of divergence 
would appear to exist in the structure of the intestinal canal, 
which does not seem to possess a loop near the excretory ori- 
fice, as in A. curvirostris ; nevertheless a great dilatation of the 
canal exists in.an analogous position, forming apparently a 
strong muscular rectum. At the same time, we speak with 
hesitation as our opportunities of investigating the structure 
of the species haye not been sufficient to enable us to decide 
with certainty this and other points. 
EXPLANATION OF PLATE TL 
Fig. 1. Acantholeberis curvirostris (Miller), 9 
Fig. 2. Anterior antenna of the same species. 
Fig. 3. Portion of the terminal half of the seta attached to the first joint 
of the lower branch of the posterior antenne; greatly magnified" 
Fig. 4. Portion of the terminal half of the seta attached to the second 
joint of the lower branch of the posterivr antenne, greatly en- 
larged. 
. Abdominal claws. 
. Acantholeberis sordida (Lievin), 2 
. Abdomen of the same species. 
a oe 
“1 oc oO 
. Sete from the ventral margin of the carapace. 
a 
Foi 
< @ 
. Sete from the posteroventral angle of the carapace. 
VOI. VI. PY. I. H f 
