263 
The capitulum (Fig. 23) is rather distinctly limited from the 
peduncle owing to the hair fringe. The earinal area is occupied 
by the peduncle, which extends like a tongue upwards between 
the scuta to the base of the terga. 
On account of the entire absence 
of calcareous substance, and the 
thinness of the valves, the capi¬ 
tulum is rather pellucid, allowing 
the outlines of the animal to 
shine through the plates; it is 
then easily observed that the 
animal, when withdrawn, also in 
this small species occupies the 
, Fig. 23. Ibla pygmæa from 38° 12’ S., 
Same reverse position as in the 149040 ’E. a hermaphrodite in side view, 
Other species of the genus. b mandible, c maxilla. [aXl7,b-cX215]. 
The tergum is triangular, 
its upper (earinal) margin convex, the scutal margin straight, the 
occludent margin is exeavated, and more strongly arched in its 
upper part so that the apex points forward in a curious beak-like 
manner. The lines of growth are very difficult to observe. 
Also in the scuta lines of growth are all but invisible. The 
scutum is triangular with straight occludent and tergal margins 
which meet in a pointed apical umbo. The basal margin, on the 
other hånd, is strongly arched, thus lending the species an aber- 
rant aspect, as compared with related species. 
No trace of a carina could be detected in the adult. 
The peduncle is short, except in the posterior (earinal) side, 
where it protrudes tongue-like upwards between the scuta to the 
base of the terga. The surface is covered with warts; these may 
be more spine-like, although low. Here and there longei hairs 
occur; in the tongue-like area between the scuta the hairs are 
more numerous, and they here often appear rather crowded passing 
into the peculiar single-rowed fringe of long hairs which adorns 
the limit towards the capitulum. The hairs are rather stout. 
This peculiar Ibla attains only a small size; the entire length 
of the greater specimens does not quite reach 3 mm, that of the 
capitulum seldom exceeding 2 mm. The peduncle (including the 
dorsal tongue-like area) is about 1,5 mm. 
