of the Fishery Board for Scotland. 



208 



Lighthouse, Firth of Forth, during February this year. A number of 

 specimens were obtained. The anterior antenna) are six-jointed, short, 

 stout, and furnished with several strongly plumose setae ; 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). Kostrum prominent, 

 moderately broad; extremity rounded, and extending beyond the geniculate 

 anterior antennae. Secondary branch of the posterior antennae 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 setae. Foot-jaws and swimming feet as described and 

 figured by Mr Thompson. Fifth pair large, foliaceous ; iuternal 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' setae 

 (fig. 6). 



Jones iella hycenw differs from uther 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 antenna) being three- 

 jointed : * these differences may render it necessary to modify the generic 

 description, or to remove Jonesiella hyeenx 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, pi. v. rigs. 10-15. 

 1880. Delavalia palustris, idem, ' Mon. Brit, Copep.,' vol ii. 



p. 43, pi. 1. figs. 1-8. 



Habitat. — Estuary of the Forth, in the vicinity of Culross, rather 

 scarce. Common in brackish water pools at the mouth of the Peffcr Burn, 

 Aberlady Bay, $ 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 ajfinis, Poppe ; Tachidius crassicomis, Scott ; Delavalia 

 palustris, Brady ; Thalestris harpactoides, Claus ; Platychelipus littoralis. 

 Brady ; Hersiliodes littoralis (Scott) ; Acartia longiremis, Lilljeborg ; 

 Temora longicornis, M tiller, &c. A few of these, as Eurytemora affinis, 

 Tachidius crasskoriiis, Delavalia })alustris, and Hersiliodes littoralis, have 



* We have recently ascertained that Joueaiella spinulosa has the secondary branch, 

 also three-jointed, the intermediate joint being very small. 



