264 
In contracted specimens the position of the body agrees with 
that of the other Ibla- species. A rather broad interval is found 
between cirrus I and the following cirri. 
Cirrus I has very unequal rami, the anterior ramus being a 
little more than half as long as the posterior one. Only in the 
outer half of the rami a distinet limitation of the segments is ob- 
served, fading away in the basal half. Cirrus II to VI are of al¬ 
most equal length, siender, and with numerous segments; the rami 
are all but equal in each cirrus. 
The caudal appendages are a little longer than the proto- 
podite of cirrus VI, siender, and consisting of 10 segments; they 
are adorned with long, delicate hairs which form a tuft at the dis¬ 
tal end of the appendage. 
The penis is about as long as cirrus VI. 
The la brum is not very bullate; its finer structure could not 
be made out with certainty in the specimens dissected. 
The man di ble has three almost equidistant teeth; at the base 
of the inferior one a denticle is present at the lower side. The 
lower angle of the mandible has three pointed denticles represent- 
ing the pectination of other species. 
The max i 11a is curiously siender, with two large upper spines 
occupying most of the cutting edge; below these spines three fine 
and short bristles are present. Both the maxilla and the mandible 
are only sparsely hairy. 
Ovigerous specimens have about 16 rather large ova at a time 
in the mantie cavity, and here also two or three complem ental 
males are present. Their development is arrested in the cypris- 
stage (Fig. 24) with an entire length of only 0,55 mm, and only 
by a more thorough study I became sure of their nature. The 
enormous development of their eyes is most peculiar; they appear 
as two large, dark brownish pigmented spots, which are observed 
already externally in the ovigerous hermaphrodite. The elements 
of these composite eyes are seen as small luminating spots, and 
the eyes strongly recall the eye of a Daphnia. — The antennae 
are seen originating just below the eye; they have a large basal 
segment, and two smaller distal ones, but do not seem to have 
any prehensile funetion. The cirri keep the shape of the cirri of 
