of the Fishery Board for Scotland, 



111 



the past summer, was found to contain many copepods, some of them 

 being rare forms ; several specimens of Stephos scotti were obtained in 

 this gathering, and they included both males and females. The dissections 

 of both species corresponded exactly with Prof. G. 0. Sars' description 

 and figures in the work referred to. 



The two drawings (pi. ii., figs. 1 and 2) represent an adult female and 

 male from the Granton quarry gathering ; the only obvious external 

 difference between them is in the structure of the fifth pair of feet, separate 

 drawings of which are represented by figures 3 and 4. A full description 

 of the species, with drawings, is given by Prof. Sars in the work already 

 mentioned. 



Genus Farastephos, G. O. Sars (1902). 



Parastephos pallidus, G. O. Sars. PI. ii., figs. 5-10. 



1892. Farastephos pallidus, G. 0. Sars, Crustacea of Norway, 

 vol. iv., p. 65, pi. xliv. 



The genus Parastephos was recently instituted by Prof. G. 0. Sars for 

 a single male specimen of a copepod found many years before at Sjerjehavn, 

 west coast of Norway, in about 100 fathoms, where the bottom was soft 

 and muddy. 



During the past summer, while examining a bottom tow-net gathering 

 collected near the head of Loch Fyne in November, 1901, I observed 

 several specimens, both males and females, of this interesting species ; but 

 though most of the male specimens were adult, the females, with the 

 exception of one, were more or less immature. The drawings of the male 

 prepared by Prof. G. 0. Sars are perfectly characteristic, but the figures 

 given here may be useful to those who have not seen the drawings of the 

 learned author referred to. 



The species is a moderately large one, the adult male (fig. 6) is very 

 nearly two millimetres in length, while the adult female (fig. 5) is some- 

 what larger, being 2*19 mm. (about of an inch). The description of 

 the fifth feet of the male may be best given in Prof. G. O. Sars' own 

 words : — " Last pair of legs in the male largely developed and very 

 asymmetrical, right leg slender and terminating in a strong denticulated 

 claw, left leg much coarser, with the antepenultimate joint the largest ' 

 (fig. 10). The distal portion of the right leg can apparently be folded 

 completely back upon the proximal portion as shown in the figure. 



The female antennules resemble those of the male ; they are equally 

 elongated and composed of twenty-four joints, the second and eighth joints 

 are each nearly as long as the combined lengths of the two joints which 

 immediately follow them. The antennules are only sparingly setiferous, 

 and are furnished with several small sensory filaments (fig. 7). The fifth 

 pair in the female appear also to be asymmetrical ; in the only adult 

 specimen obtained the left leg of the fifth pair is considerably longer than 

 the right one, but this appears to be the only difference (fig. 9). 



In the female, each of the first three abdominal segments expands 

 posteriorly into a ridge which is fringed with fine hairs, as shown in 

 fig. 2. 



In the adult male represented by the drawing, the second pair of 

 thoracic feet (fig. 8) are alike on both sides, the outer branches being both 

 three-jointed and the inner two-jointed. Prof. G. 0. Sars, in his descrip- 

 tion of the only male specimen he had, states that the outer branch of the 

 right foot of the second pair was only two-jointed ; but such a difference 

 is rather unusual among the Calanoida, and probably his specimen may 



t 



