255 Part III. — Seventeenth Annual Report 



Mandibles as in Canthocamptus, mandible-palp one-branched, and 

 furnished with a few setae ; the basal joint is armed with a moderately- 

 stout apical spine (fig. 15). Other mouth organs as in Canthocamptus. 

 First pair of swimming feet with both branches moderately short, and of 

 nearly the same length ; the outer branches are three-jointed, but the 

 inner are composed of only two joints, as in Attheyella ; the first joint of the 

 inner branch is about equal in length to the first two joints of the outer 

 branches, and is also somewhat stouter; the second joint is little more 

 than half the length of the first one (fig. 16). 



The second, third, and fourth pairs of swimming feet have both 

 branches three-jointed ; the outer branches are considerably longer than 

 the inner ; in the fourth pair the inner branches are only about a third 

 of the length of the outer branches (fig. 17); the first joint of the inner 

 branches of the fourth pair are very small ; the outer branches are 

 furnished with long terminal setae. The fifth pair are small and folia- 

 ceous ; and the inner portion of the basal joint is considerably produced, 

 and is subcylindrical in outline ; the apex is subtruncate and bears four 

 setae, the two inner ones being small, while the other two are elongate ; 

 the secondary joint is ovate, and furnished with several setae on the 

 outer margin and apex. All the setae are of considerable length, except 

 a small one near the base of the outer margin (fig. 18). Caudal furca 

 short, and about as broad as long (fig. 19). 



Habitat. — Shore between Fairlie and Hunterston, Firth of Clyde. 

 Rather rare. No males have been observed. 



Remarks. — The Copepod just described resembles more or less closely 

 not only Canthocamptus, but also Attheyella and Mesochra. It differs 

 from the typical Canthocamptus in having the inner branches of the 

 first pair of swimming feet only two jointed, while the inner branches of 

 all the next three pairs are three-jointed. It also differs from Attheyella 

 and Mesochra in having the inner branches of the second, third, and 

 fourth pairs three-jointed, though agreeing with these two genera in the 

 structure of the first pair. Moreover, it somewhat resembles Niiochra in 

 the antennules being distinctly bent at the second joint ; but in that genus 

 all the first four pairs of swimming feet have the inner branches three- 

 jointed. 



Psyllocamptus fairliensis seems to form one of the links in a chain of 

 Copepods that at the one end terminates in Mesochra, which has the 

 inner branches of all the four pairs of swimming feet two-jointed, and at 

 the other end in Nitochra, which has the same branches all three-jointed. 

 The generic name is derived from the two Greek words psylla — a flea, and 

 Jcamptos — flexible. 



Huntemannia jadensis, S. A. Poppe. 



1884. Huntemannia jadensis, Poppe, Abhandl. d. nat. Ver. 

 Bremen, Bd. IX., p. 59. 



1885. Huntemannia jadensis, Poppe, Die freilebenden Copep. 

 des Jadebusens, op. cit., Bd. XL, p. 167, PI. VII., figs. 10-20 



1895. Huntemannia jadensis, T. and A. Scott, Ann. and Mag. 

 Nat. Hist. (6), vol. xv., p. 57, PI. VI., figs. 21, 22. 



This species was described by Dr. Poppe in 1884. It was first detected 

 in Scotland in 1894, in brackish water pools, at the head of West Loch 

 Tarbert (Cantyre), and a record of its occurrence there was published in 

 the " Annals and Magazine of Natural History V for 1895, but up till the 

 present time this appears to be the only record of its occurrence in Scotland. 

 On 4th November 1897, Mr. F. G. Pearcey collected a gathering of 



