FROM THE FAROE CHANNEL. 3 
non-prehensile. Fifth pair small, composed of two joints; basal 
joints usually not greatly developed; secondary joints usually 
small, but quite distinct. 
Remarks.—This genus appears to be more nearly related to 
Tachidius than to any of the other allied genera, but it differs 
distinctly in the structure of the secondary branches of the 
antenne and of the fifth pair of thoracic feet. Moreover, though 
it might be included in the subfamily Tachidiine, Boeck, with as 
much propriety as the genus Robertsonia, G.S. Brady, which 
has the fifth pair also composed of two joints, I prefer meanwhile, 
till we know more about the structure of the male, to regard 
Pseudotachidius simply as a member of the Harpacticide. 
PSEUDOTACHIDIUS SIMILIS, sp. n. (PI. 1. figs. 1-8.) 
Description of the femaie.—Length about :8 mm. (35 of an 
inch). The body is moderately robust and, when seen from 
above, is subcylindrical, but tapering slightly towards the 
posterior end; the rostrum is moderately broad and rounded 
(fig. 1). 
The antennules are short and stout, and composed of five 
joints, but the fourth joint is very small (fig. 2); they are each 
provided with numerous plumose sete, and a short and stout 
sensory filament springs from the distal end of the third joint, 
as shown in the figure. 
The antenne (fig. 3) are somewhat similar in structure to those 
of Pseudotachidius coronatus, T. Scott; but there is some differ- 
ence of the armature, especially of the primary branches, the 
terminal spines of which are stouter than in that species. 
The mandibles (fig. 4) are moderately stout, the biting-edge in 
each is subtruncate and armed with several small teeth: The 
basal jomt of the palp is somewhat dilated and provided with 
two small setiferous branches ; the upper branch is composed of 
one and the lower of two joints, as shown in the drawing. The 
mandibles and other mouth-organs resemble the organs corre- 
sponding to them in Pseudotachidius coronatus. 
The first four pairs of thoracic feet have both branches three- 
jointed. In the first pair the second basal joints are each pro- 
vided with a stout setiferous spine on both its outer and inner 
aspects ; both branches of this pair, as well as the marginal 
spines of the outer branches, are also setiferous (fig. 6). The 
inner branches are scarcely so long as the outer ones, whereas 
