255 



166. Laophonte littoralis, Scott. 



(PJ. CLXXV). 



Laojjltonte littorale. Scott, On some new and rare Crustacea from Scotland. Ann. Mag. Nat. Hist. 



ser. 6, Vol. XII, p. 238, PI. XF, figs. 714. 



Specific Characters. Female. Body somewhat robust, with the anterior 

 division slightly depressed and broader than the posterior. Cephalic segment 

 comparatively large, equalling in length the 4 succeeding segments combined, 

 rostral projection short, triangular. Urosome almost as long as the anterior 

 division, and having the anterior segments slightly expanded laterally, last seg- 

 ment fully as long as the preceding one. Caudal rami about twice as long as 

 they are broad and somewhat divergent, apical setae rather elongated. Anterior 

 antennae of moderate length and somewhat thickened at the base, 7-articulate. 

 Posterior antennae rather strongly built, outer rarnus, however, extremely small, 

 conical in form, and only provided with 2 hair-like bristles. 1st pair of legs 

 powerfully developed, with the inner ramus very strong, outer rarnus exceeding 

 half the length of the proximal joint of the inner, and 3-articulate, middle joint 

 much the longest. Natatory legs normal, except that the terminal joint of the 

 outer ramus in the 4th pair wants any seta of the inner edge. Last pair of legs 

 well developed, distal joint rather large and having the form of a regularly rounded 

 lamella, with 6 comparatively short marginal setae; inner expansion of proximal 

 joint not extending to the middle of the distal joint, and provided with 5 marginal 

 setae, the 2 outer of which are smaller than the others. Ovisac rather large, 

 rounded oval in form. 



Male with the outer rami of 2nd and 3rd pairs of legs scarcely at all 

 differing in structure from those in female. Inner ramus of 2nd pair with the 

 proximal seta of the last joint transformed to a short and thickish spine; that of 

 3rd pair 3-articulate, with the terminal joint very short, middle joint, as usual, 

 produced at the end outside to a spiniform process. 4th pair of legs very unlike 

 those in female, outer ramus exceedingly powerful and incurved, with the spines 

 very large, 3 of them issuing from the terminal joint; inner ramus much reduced 

 in size, uniarticulate, with a single seta and 2 hair-like bristles. Last pair of 

 legs with the distal joint not defined, it being replaced by 3 small setae, inside 

 which another similar seta is attached. 



Colour light yellowish grey. 



Length of adult female 0.67 mm. 



Remarks. Though the habitus-figure of this species given by Scott looks 

 rather unlike that here reproduced, I cannot doubt that the present form is the 

 same as that observed by the said author, since in all the structural details it 



