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Part III. — Sixteenth Annual Report 



next to the biting lobe, and both are setiferous ; a small supplementary- 

 joint bearing three terminal plumose setJB springs at right angles from the 

 base of the bilobed process. Posterior foot-jaws small and two-jointed ; 

 the second joint is somewhat dilated, and bears on the inner aspect a 

 series of minute spines, as shown by the drawing (fig. 1, PI. XV.) ; a short 

 and stout setiferous spine springs from near the middle of the inner 

 margin, and a stout plumose seta arises from the distal end of the inner 

 margin of the first joint; the terminal claw is moderately stout, but 

 considerably shorter than the joint to which it is articulated. In the 

 first pair of swimming feet (fig. 2, PI. XV.) both branches are three-jointed ; 

 the inner branches, which are elongate, have the first joint longer and 

 considerably stouter than the second and third, being about double the 

 breadth and nearly equal to the entire length of these two joints. The 

 first joint is also furnished on the exterior aspect with one or two 

 obliquely transverse rows of small spines, while a stout seta springs from 

 the distal half of the inner margin ; the second and third joints are also 

 each provided interiorly with a marginal seta and with several small 

 spiniform hairs on the outer edge ; moreover, the third joint, instead of 

 being armed with a terminal claw, is provided with two stout setae, one 

 being fully twice the length of the other ; the outer branches are small, 

 being little more than half the length of the inner branches ; the first 

 joint is rather longer than either the second or third, but the second and 

 third are subequal. The second, third, and fourth pairs have both 

 branches also three-jointed ; the inner branches are somewhat shorter than 

 the outer, and both are moderately stout and setiferous (fig. 3, PI. XV.). 

 The fifth pair (fig. 4, PI. XV.) are small ; the basal joint is of considerable 

 width, but it is short except interiorly, where it is produced into a some- 

 what conical prolongation that terminates in an elongate and stout seta 

 which is coarsely plumose ; a long and stout seta also springs from the 

 exterior angle of the basal joint, as shown by the figure ; the secondary 

 joint is very small and subquadrangular, and bears two moderately long 

 setae — one on each of the interior and exterior angles ; intermediate 

 between these are two small spines. No male specimens have been 

 obtained. 



Habitat. — Off Skate Island, Lower Loch Fyne, in 105 fms,; rare. 



Remarks. — This curious Copepod does not seem to fit with any 

 described genus known to us. In some respects it resembles Tachidius — 

 hence the generic name that has been adopted for it; but the combined 

 peculiarities in the structure of the antennules, antennae, mandibles, and 

 first and fifth pairs of feet do not fit in with the characters of any known 

 genus. 



Tetragoniceps consimiUs, T. Scott. This species, like Tetragoniceps 

 hradyi, has the fifth pair of thoracic feet remarkably broad and leaf-like. 

 It was rare in the dredged material from Otter Spit. 



Laophonte longicaudata, Boeck. Was dredged at Otter Spit, but was 

 apparently rare. 



Cletodes similis, T. Scott. This species, though moderately small, is 

 robust, and may be distinguished by the form and armature of the first 

 pair of swimming feet ; the outer branches and the basal joints to which 

 they are articulated are more or less ciliated. This species was also 

 dredged at Otter Spit, 



