FKOM TUE FAROE CHANNEL. 6 



iiou-preliensile. Fifth pair sDiall, composed of two joints ; basal 

 joints usually not greatly developed ; secondary joints usually 

 small, but quite distinct. 



Bemarhs. — 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 

 antennae and of the fifth pair of thoracic feet. Moreover, though 

 it might be included in the subfamily Tachidiince, Boeck, with as 

 much propriety as the genus Bohertsonia^ Gr. 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 

 Pseudotachid'ms simply as a member of the Harpacticidse. 



PsEUDOTAcniDiTJS siMiLis, sp. n. (Pi. 1. figs. 1-8.) 



Description of the female. — Length about "8 mm. (3^;^ of an 



iijch). The body is moderately robust aud, when seen from 



above, is subcylindrical, but tapering slightly towards the 



posterior end ; the rostrum is moderately broad and rounded 



(fig- 1). 



The anteunules 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 setae, and a short and stout 

 sensory filament sj)rings from the distal end of the third joint, 

 as shown in the figure. 



The antennae (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 iu that species. 



The mandibles (fig. 4) are moderately stout, the biting-edge iu 

 each is subtruncate and armed with several small teeth. The 

 basal joint 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 

 m.andibles and other mouth-organs resemble the organs corre- 

 sponding to them iu 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 



1* 



