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moderately long seta at the inner corner; inner ramus with the outer 2 joints 

 short, apical claws slender and very unequal, the inner one fully twice as long 

 as the outer. Last pair of legs with the distal joint oblong in form and provided 

 in its outermost part with 6 rather unequal setae, inner expansion of proximal 

 joint considerably produced, narrow linguiform in shape, and extending beyond 

 the distal joint, marginal setse 5 in number, the middle one very thin, the others 

 thick, spiniform and coarsely denticulated. Ovisacs large, pyriform, and some- 

 what divergent. 



Male smaller than female, and exhibiting the usual sexual differences. 

 Anterior antennae transformed into strong prehensile organs composed of the same 

 number of joints as in the female. 1st pair of legs exhibiting inside the 2nd 

 basal joint a small linguiform lappet, not found in the female. Inner ramus of 

 2nd pair of legs scarcely as long as the 1st joint of the outer, distal joint rounded 

 and carrying a slender setiform spine outside, inside a long plumose seta, tip 

 produced to a strong, somewhat flexuous spiniform projection. Last pair of legs 

 rather unlike those in female, distal joint very short and imperfectly defined at 

 the base, carrying 3 denticulated spines and a small seta, inner expansion of 

 proximal joint almost obsolete, and only provided with 2 short setse. Genital 

 lobes each with a strong denticulated spine and 2 slender setae. 



Colour generally a golden yellow, ventral face and bases of legs tinged 

 with dark indigo-blue. 



Length of adult female 0.80 mm. 



Remarks. This is an easily recognizable form, being especially distin- 

 guished by the large and deep cephalic segment, and the unusually slender anterior 

 antennae. 



Occurrence. It is one of our commonest Harpacticoida, occurring rather 

 abundantly along the whole Norwegian coast in the littoral zone among algae, and 

 not infrequently left in tidal pools together with other littoral forms. 



Distribution. British Isles (Brady), coast of Bohuslan (coll. Cleve), Me- 

 diterranean (Glaus). 



