CLAVELLA EUGOSA. 217 



in the Firths of Forth and Clyde, off Aberdeen, and in 

 the Mora}' Firth (T. Scott). Off the coast of Northum- 

 berland and Durham (May E. Bainbridge). Larne, 

 Ireland (TF. Thompson). 



3. Clavella dubia T. A. Scott. 

 (Plate LXV, fig. 7; Plate LXVI, figs. 8-11.) 



1900. Anchorella rugosa var. T. Scott. (112) p. 177, pi. viii, fig. 52. 



Female. Generally resembling the female of C.un- 

 cinatvs, but having the cephalothorax rather shorter, 

 and the second maxillipeds or fixative organ scarcely 

 so prominent ; the genital segment also being more 

 robust. 



Antennules short and three-jointed, the first joint 

 robust, but tapering quickly towards the distal end ; 

 the second small, and the end one about twice as long 

 as the preceding joint, and very sparingly setiferous 

 at the apex. Mandibles tolerably stout, somewhat 

 expanded near the middle, and the biting part of the 

 inner margin provided with about four coarse teeth 

 and two or three smaller ones ; the first two teeth 

 nearly close together, a slight gap in which is a small 

 denticle dividing these two from the next one, but a 

 considerable distance separating it from the end tooth, 

 and the intervening space occupied by two denticles. 

 Maxilla3 moderately elongated, and provided with two 

 narrow terminal lobes ending in tolerably long spines. 

 First maxillipeds short, moderately robust, and pos- 

 sessing fairly stout terminal claws. 



Habitat. Found adhering to a haddock (Gadux 

 seglefinus) from the North Sea. 



This form was at first regarded as a vai-iety of Clavella 

 rugosa, but further examination reveals differences both in its 

 form and structure which, though showing- some relationship 

 with its two nearest allies, C. rugosa and C. nncinata, cannot 

 be reconciled with either. We therefore prefer to describe it 

 under a distinct name. 



