292 Part III.— Twentieth Annual Eeport 



Genus Echthrogaleus, Steenstrup and Liitken (1861). 



Echthrogaleus coleoptratus (Guerin). 



Two specimens of this species were obtained adhering to the pectoral 

 fins of a small Lamna cornuhica sent from the Fish Market at Aberdeen 

 on December 12th, 1901. 



Fam. DiCHBLESTIDiE. 



Genus Clavella, Oken (1815). 



Clavella chitha; T. Scott, sp. nov. PI. XII., figs. 26-31. 



Description of the Female. — Length about 1-5 mm. (nearly Jy of an 

 inch). This copepod is like Clavella lahracis, Van Beneden, in general 

 appearance, but is about one and a half times its size, the lateral margins 

 of the cephalic segment are also evenly rounded instead of being angular, 

 as in that species (fig. 26). 



The antennules are short, and apparently four-(? or five-) jointed, and 

 also moderately stout ; the basal joint is about as long as all the 

 other three together, while the end joint is very minute ; the armature 

 of the antennules consists of a few minute spines (fig. 27). 



The antennule represented by the drawing had the basal joint slightly 

 damaged. 



The antennae are fully as long as the antennules ; they are composed 

 of two joints and armed with a short but strong terminal claw (fig. 28). 



The maxillae are very small and simple in structure ; they consist of a 

 minute papilliform basal joint bearing three small spines as shown by the 

 drawing (fig. 29). 



The maxillipeds are also small ; they are two-(or three-) jointed, and 

 furnished with a small terminal claw (fig. 30), 



There are only two pairs of thoracic feet, and they are both somewhat 

 similar in structure. The drawing (fig. 31) represents the first pair. 

 Each foot, which has two moderately stout basal joints, is two-branched, 

 and each branch is two-jointed and furnished with two small terminal 

 spines ; in the outer branches the first joint is larger than the second and 

 bears a small spine at its outer distal angle ; in the inner branches, on the 

 other hand, the first joint is smaller tiian the end one. A small spine 

 springs from the inner distal angle of the second basal joint, as shown in 

 the figure. 



The caudal furca are very short, as represented in the full-size drawing 

 (fig. 26). 



Habitat. — On the gills of a Ctenolabrus rupestris, Lin. (Jago's Gold- 

 sinny), captured in East Loch Tarbert in 1885; but the copepods were 

 only observed during the past summer. 



Clavella lahracis, Van Beneden. PI. XIII., figs. 10-12. 



This species was recorded, but not figured, in Part III. of the Nine- 

 teenth Annual Eeport, and I now give a few figures in order to indicate 

 one or two points of difference between this species and the one just 

 described. 



The largest of the female specimens of Clavella lahracis measured 

 scarcely more than a millimetre in length. In the specimen represented 

 by the figure (fig. 10) the cephalic segment is equal to about one- fifth of 

 the entire length of the animal. The lateral margins are produced 



