of the Fishery Board for Scotland. 203 
Lighthouse, Firth of Forth, during February this year. A number of 
specimens were obtained. The anterior antenne are six-jointed, short, 
stout, and furnished with several strongly plumose set; the first joint is 
large and robust, the second, third, and fifth are short, while the fourth 
and the last joints are very small. The basal joint projects almost 
straightforward from the head, the remaining joints curve outwards so 
that the last three are nearly at right angles to the basal joint ; two stout 
spines, setiferous on the upper margin, spring from the upper part of the 
distal end of the third joint, and an elongate sensory filament and a very 
long slender and plain seta from the upper distal angle of the same 
joint ; the fifth joint is also furnished with a stout terminal spine similar 
to those on the end of the third joint (fig. 2). Rostrum prominent, 
moderately broad; extremity rounded, and extending beyond the geniculate 
anterior antenne. Secondary branch of the posterior antenne well 
developed, reaching beyond the end of the primary branch ; three-jointed, 
middle joint very small (fig. 3). Mandible palp distinctly two-branched, 
one branch long and narrow, the other short, and each furnished with 
several apical setz. Foot-jaws and swimming feet as described and 
figured by Mr Thompson. Fifth pair large, foliaceous ; internal portion of 
the basal joint well developed, sub-triangular ; apex broadly rounded ; 
exterior portion of basal joint: forming a small rounded process at the base 
of the secondary joint; secondary joint broadly ovate, scarcely reaching 
to the apex of the inner portion of the basal joint ; lateral margins of both 
joints ciliate, distal margins furnished with several ‘spear-shaped’ setie 
(fig. 6). 
Jonesiella hycenc differs from other British species of Jonesiella by 
having the inner branches of the first pair of swimming feet three-jointed, 
and also by the secondary branch of the posterior antenne being three- 
jointed :* these differences may render it necessary to modify the generic 
description, or to remove Jonesiella hyenx to another genus. There can 
be no doubt, however, that the general structure of this species agrees 
fairly well with the more typical members of the genus in which it is 
placed. 
Genus Delavalia, Brady (1868). 
Delavalia palustris, Brady. 
1868. Delavalia palustris, Brady, Nat. Hist. Trans. Northumb. 
‘and Durham,’ vol. iii. p. 134, pl. v. figs. 10-15. 
1880. Delavalia palustris, idem, ‘Mon. Brit. Copep.,’ vol. ii. 
p. 43, pl. 1. figs. 1-8. 
Halitat.—Estuary of the Forth, in the vicinity of Culross, rather 
scarce. Common in brackish water pools at the mouth of the Petfer Burn, 
Aberlady Bay, 2 with ovisacs. Delavalia palustris appears to be re- 
stricted to localities where the water is more or less brackish. In the 
monograph of the ‘ British Copepoda’ it is recorded from only one locality 
—the mouth of the Seaton Burn, Northumberland. 
It may be of interest to enumerate some of the Copepoda that have been 
found associated together in the upper reaches of the Forth estuary, as 
Eurytemora affinis, Poppe; Tachidius crassicornis, Scott; Deluvalia 
palustris, Brady ; Thalestris harpactoides, Claus ; Plutychelipus littoralis, 
Brady ; Hersiliodes littoralis (Scott); Acartia longiremis, Lilljeborg ; 
Temora longrcornis, Miller, &e. A few of these, as Hurytemora affinis, 
Tachidius crassicornis, Delavalia palustris, and Hersiliodes littoralis, have 
* We have recently ascertained that Jonesiella spinulosa has the secondary —— 
also three-jointed, the intermediate joint being very small. 
