segment a marginal seam, most distinct in the middle, is found. 
The hindmost margin of the thorax and the front margin of the 
abdomen is connected by a delicate articulate membrane (fig. 2, m), 
which is very long in the middle, but disappears laterally, where 
we find on each side a tubercle on the cephalothorax, acting as a 
condylus in a cavity on the first abdominal segment, thus establishing 
a typical ginglymous joint. 
The following nine sclerites, which are all longitudinally divided, 
are with the exception of the tenth, in which the skin appears 
mosaic, rather coarsely and irregularly reticulate, especially in the 
last third portion of each sclerite. The eleventh tergite is com- 
pletely fused with the corresponding sternite and placed ventrally 
and surrounding the anus. In front of the anus seven distinct sternal 
sclerites are observed (pl. I, fig.3—4; text fig.1, p.10; 28, tav. IV, 
fig. 2); the third sternite is represented by a small triangular piece 
on each side; in addition to this several chitinous structures, 
amongst which the first pair of stigmata (fig. 3, s 1—2), are found. 
AÅ remarkable feature is the dorsal lateral row of fifteen and the 
ventral of fourteen lateral sclerites (fig. 1, 28, tav. IV, fig. 2). 
Antennae (pl. I, fig. 5; 28, tav. IV figs 4—5). — To Elling- 
sen's description of these organs I shall only add that the flagellum 
seems to consist of a single hair only, that the serrula exterior - 
has the three terminal teeth short, and that the galea contains a 
single central canal for the discharge of the spin. The fact that 
the antennae are generally covered by the front margin of the head 
in so high a degree, that they are not visible from above when in 
natural position, and that, even when completely stretched out, only 
their anterior portion is seen, may perhaps explain the structural 
feature, that they are only partly granular. The absence of the 
lamina interior is not surprising, if the function of this organ is 
to assist in cleaning the large chelae (cf. 29, p. 24), when the ir- 
regular form of the front margin of the head and the palps is 
considered. 
Maxillæ (pl. I, fig. 6; 28, tav. IV, fig. 3). The granulation 
