of the Fishery Board for Scotland. 



269 



Dadylopus peetinatus, T. and A. Scott (PI. XV., figs. 17-24). 



1898. Dadylopus pcdinatus, T. and A. Scott, 'Ann. and Mag. 

 Nat. Hist.,' ser. 7, vol. i. p. 187, PI. X., figs. 9-lG. 



This Dadylopus somewhat resembles D. siromii in general appearance ; 

 it is moderately robust, and measures about -7 mm. of an inch) in 

 length. Dadylopus pedinattis has seven-jointed antennules, the first four 

 joints being stout and subequal, while the other three are comparatively 

 small (see fig. 18, PI. XV.). The secondary branches of the antennae are 

 wo-jointed. The mandibles and maxillfe of this species, as well as some 

 other of its structural details, resemble the same parts in D. rostratus. 

 The somewhat remarkable characters that chiefly distinguish Dadylopus 

 pedinatuSj and which suggested the specific name applied to it, are the 

 striking comb-like series of marginal spinules on the terminal claws of the 

 posterior foot-jaws and inner branches of the first pair of swimming feet. 

 This character of the terminal claws referred to, especially those of the 

 inner branches of the first pair of swimming feet, arrested the attention at 

 the time this Copepod was first observed, being readily noticed without 

 resorting to dissection. But besides this peculiar characteristic of the 

 species, it is well that another divergence in the structural details of the 

 same inner branches should also be noticed. These inner branches are 

 apparently only two-jointed, and in this respect differ from the normal 

 structure of Dadylopus, and there is also a slight difference in the struc- 

 ture of the outer branches. This difficulty was felt wlien the species was 

 first described, but as it possessed so many of the characters of a true 

 Dadylopus it was considered preferable meanwhile to ascribe it to that 

 genus. No males have been observed. 



This species was discovered early in 1896 amongst some refuse trawled 

 between Lowburn and Cairndow, Upper Loch Fyne. 



Thalestris peltata (Boeck). Several specimens of this Thalestris were 

 obtained amongst some dredged material from the vicinity of Otter Spit. 

 Thalestris peltata is so unlike most of the other species of the genus that 

 it may readily be passed over as some other form, but the structure of the 

 mouth organs and of the first pair of swimming feet clearly indicate its 

 relationship with the genus in question. 



Thalestris rufocinda, Norman. This species is also from the Otter 

 Spit. The spinous armature of the swimming feet readily characterises 

 this ThalestiHs, which is one of the more common species of the genus. 



Harpaclicus Jlexus, Brady and Robertson. This Harpadicus was 

 frequent in a gathering of Entomostraca collected in East Loch Tarbert 

 in 1885, but was somehow overlooked until recently. It is a compara- 

 tively small species, but quite distinct. 



Zaus goodsiri, G. S. Brady. This fine species was obtained at Otter 

 Spit and one or two other places. It appears to be somewhat local, but 

 where it does occur it is not unusual to find it more or less common. 



Lichomolgus alhens, Thorell, was another of the species found at Otter 

 Spit, and this is also the first time it has been obtained in the Clyde 

 district, 



