273 

 180. Laophontodes expansus, G. 0. Sars, n. sp. 



(PI. CLXXXIX). 



Specific Characters. Female. Body comparatively short and stout, flat- 

 tened, with the lateral parts of the segments lamellarly expanded. Cephalic 

 segment very large, with the lateral edged evenly curved and densely clothed 

 with long cilia; rostral projection rather prominent, terminating in a spiniform 

 point. Lateral parts of the succeeding segments produced to narrow linguiform 

 plates densely ciliated at the end. Urosome much shorter than the anterior 

 division, and having all the segments, except the last, expanded laterally in a 

 manner similar to those of the anterior division, last segment short and broad, 

 with the anal opercle prominent and finely spinulose at the edge. Caudal rami 

 long and slender, linear in form, and considerably divergent, inner edge ciliated 

 in the middle, outer edge exhibiting in front of the middle two small tufts of cilia, 

 setse of this edge rather distant, dorsal and apical setse about as in L. bicornis. 

 Anterior antenna comparatively slender, but composed of only 4 joints, the terminal 

 part being uniarticulate. Posterior antennae and oral parts about as in the 2 

 preceding species. 1st pair of legs also rather similar, though comparatively more 

 strongly built, with the apical claw of the inner ramus rather strong, and the ac- 

 companying seta much elongated. Natatory legs without any set* inside the outer 

 ramus, apical seta of this ramus very small and rudimentary; inner ramus of 4th 

 pair of legs likewise much reduced, and only provided with a single apical seta. 

 Last pair of legs with the proximal part much shorter than the distal one, and 

 without any seta inside, distal part, like the proximal one, clothed at the edges 

 with irregular tufts of hairs, setae 5 in number, 2 of them issuing from the 

 upper face. 



Male unknown. 



Colour not yet ascertained. 



Length of adult female 0.41 mm. 



Remarks. In its external appearance this form differs considerably from 

 the 2 preceding species. It is however undoubtedly congeneric with them, ex- 

 hibiting in the structural details all the chief features of the present genus. 



Occurrence. Only 2 female specimens of this remarkable form have as 

 yet come under my notice. They were found in a sample taken by Mr. Nord- 

 gaard in the Salten Fjord, and kindly sent to me for examination. 



30 Crustacea, 



