of the Pisnery Board for Scotland. 254 
Robertsonia tenuis (G. S. Brady and Robertson). 
1875. Lctinosoma tenue, B. and R., ‘‘ Proceed. of the Brit, Ass.,” 
bP 96. 
A few specimens of this well-marked species occurred in a small 
gathering of Microcrustacea from Station XVI. (Moray Firth), depth 30 
to 40 fathoms, collected on 10th June 1898. The gathering consisted of 
the washings of some dredged material. 
Delavalia mimica, T. Scott. 
1897. Delavalia mimica, T. 8., Fifteenth Ann. Rep, Fish. Board 
mente Bile p./'o0,Pl. L.; figs. 1-9. 
This species was obtained in a gathering from Station XVI. (Moray 
Firth), collected on 10th June 1898, but was somewhat rare. 
Delavalia emula, T. Scott. 
1893. Delavalia emula, T. 8., Eleventh Ann. Rep, Fish. Board 
Scot., Pt. IIL, p. 204, Pl. IV., figs. 36-47. 
This species was obtained in some dredged material collected a little to 
the west of Invergordon, and was also somewhat rare. 
Delavalia giesbrechti, T. and A. Scott, var. (Pl. XIII, figs. 20-22), 
1890. Delavalia giesbrechtt, T. and A. S., Ann. Scot. Nat. Hist., 
p. 225, Pl. IV., figs. 1-10. 
A form of Delavalia has been obtained at Hunterston, Firth of Clyde, 
which resembles Delavalia giesbrechtt very closely, but it wants the 
peculiar broad tail setze that constitute such a marked feature in that 
species (fig. 22); there is also a slight difference in the arrangement of the 
four marginal sete on the inner portion of the basal joints of the fifth 
thoracic feet (fig. 21). In other respects the two forms appear to be 
similar. Fig. 20, which represents the first pair of swimming feet, shows 
the second joint of the inner branches to be rather more slender than 
the same joint in typical D. qiesbrechti. 
Psyllocamptus, gen. nov. 
Similar to Canthocamptus, but the inner branches of the first pair of 
swimming feet, which are about equal in length to the outer branches, 
are two-jointed, while the inner branches of the next three pairs are all 
three-jointed. Moreover, the antennules in spirit specimens are distinctly 
bent at the second joint as in Nitochra. 
Psyllocamptus fairliensis, sp. n. (Pl. XIII, figs. 12-19). 
Description of the Female.—Length about ‘6 mm. (4 of an inch). 
Body slender and elongate, and resembling Canthocamptus in general 
appearance (fig. 12). Antennules moderately short and setiferous, eight- 
jointed ; the first two robust, the penultimate joint smaller than the 
others (fig. 13); the formula shows approximately the paca 
lengths of all the joints— 
Number of the joints, he wo Or Oe ae 
Proportional lengths of the joints, 24°24°7°9°6°7°4°6 
Antenne short, three-jointed ; secondary branch small, one-jointed, 
and furnished with three sete (fig. 14), 
