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that thus 12 complete segments are found in the abdomen 
in Chelonethi, as the Ist sternite can be proved in 
several main genera. 
F. Ambulatory Limbs. 
Of the ambulatory limbs I have in Arthr. Dan. (p. 
518—20, with corresponding figures in Zoolog. Dan.) given 
a detailed representation, in a main point differing much 
from the interpretations set forth both before and after. 
By renewed study I have found a new striking feature 
to confirm the correctness of my interpretation. The 
matter being of importance I shall resume the essential, 
in refering to my new drawings of the 2d pair of legs 
in Chelifer, Garypus and Obisium (Tab. IV, fig. 13-—15). 
The 2 hindmost pairs of legs are in the main 
uniform in all Cheloneth:. Each of these legs consists 
of coxa, trochanter, femur, tibia and tarsus. The basal 
portion of femur is more or less distinctly cut off bya 
weak articulation, allowing a slight or no curving in the 
horizontal plane, and this joint has been called tro- 
chantin, a name not well chosen, as it has been 
formerly used by the Insects indicating a chitinous plate 
(a joint) between the coxæ and the body. Tarsus is 
l-jointed in Chiridium and Chelifer (Chernes), 2-jointed 
in the other main genera. 
The 2 anterior pairs of legs in Chiridium and 
Chelifer are almost like the 2 posterior pairs, yet the 
trochantin is particularly well cut off in Chelifer (Tab. 
IV, fig. 18, c) and completely wanting in Chiridium; 
form et cet. show plainly that femur in Chiridium is 
homologous with the trochantin (c) plus femur (d), 
together marked f in fig. 13. Tarsus is 1-jointed. In 
Garypus latus H.J.H. femur (fig. 14, f) is almost twice 
as long as tibia (g), which is comparatively short, close 
