122 Wisconsin Academy of Sciences , Arts, and Letters. 
tingushed as a muscle was seen, but in each segment two or 
three fine strands were present, these, however, mjight have been 
processes from the muscles of the first, two segments or nerves 
passing out to the terminal setae. The setae of the antenna 
are all situated at thj distal end of the segment on which they 
are borne. The first segment has two setae, one smaller, on the 
inner dorsal, and one larger on the inner ventral surface, while 
the following segment has but one near the middle line of the 
inner surface. The third segment has two setae which have the 
same relative position as those on the first. The five setae of 
the next segment are longer than any so far mentioned; four 
of them) are borne on the inner and two on the outer 1 surface. 
The fifth segment is without setae, but the last bears six ter¬ 
minal ones, slightly longer than those on the fourth. All these 
are nearly similar in structure. 
Second antenna: —S. Fischer (6) has called the second an¬ 
tennae the “Antennenfusse,” an exceedingly appropriate name 
when one considers their 1 use. They are used entirely in crawl¬ 
ing, their fitness for which is shown in the backwardly directed 
claws and the exit through the flabellum of the secretion of the 
adhesive gland. 
Claus (3) mentions that the second antenna possesses a basal 
piece which corresponds toi the protopodite and is formed by 
two small pieces, coxa and trochanter, fusing together. This 
basal piece is here not. present as a, separate segment, PI. X, fig. 
2, but is very likely represented by a large chitinous piece which 
is withdrawn entirely within the body, making the femur the 
basal or first segment. Five muscles have their origin within 
this segment, three on the dorsal wall, and two from the chitin¬ 
ous strands at its base. These latter two are inserted near each 
other at the base of the next segment. Of the other three the 
lowest is inserted at the base of the flabellum, the middle one 
passes on to the base of the third segment, while the upper one 
passes through the three' following segments to be inserted at 
the base of the terminal claws. Xear the boundary of the third 
and fourth segments this last muscle gives place to a strong ten¬ 
don which just before its insertion runs through a chitinous 
pulley. This pulley makes possible the movement of the claw 
