aa 



all produced, and the marginal claws comparatively thinner than in female; 

 anterior upturned process slender, falciform, and terminating in a thin setiform 

 point. Chief piece of the copulatory apparatus short and thick, almost globular 

 in shape, and clothed all over with small spikes. 



Colour whitish gray, variegated with a light yellowish green pigment 

 forming irregular patches radiating, as in P. orbicularis, from the centre of 

 each valve to the margins. 



Length of adult female amounting to 0.78 mm. 



Remarks. The above-described form is nearly allied to the typical species, 

 but of somewhat larger size, and moreover easily recognised by the closely 

 punctate sculpture of the valves and the wholly absence of any reticulation on the 

 same. In the fresh state it also distinguishes itself by a rather different colour. 



Occurrence. I have only met with this form in a single locality of the 

 Norwegian coast, viz., off the Lofoten islands, where it occurred at the consider- 

 able depth of 120250 fathoms. 



Distribution. ? British Isles (Brady). 



3. Polycope areolata, G. O. Sars, n. sp. 



(PI. XVI, fig. 1). 



Specific Characters. Female. Shell far less tumid than in the 2 pre- 

 ceding species, seen laterally, of a somewhat irregular rounded shape, with 

 the greatest height a little behind the middle and not attaining the lenght, 

 dorsal margin abruptly arched beyond the middle, ventral margin forming a 

 more even and rather bold curve, anterior extremity conspicuously bowed in 

 the middle, posterior bluntly truncated, with no trace of angle below; seen 

 dorsally, regularly oval in outline, with the lateral edges quite evenly curved, 

 the greatest width scarcely exceeding half the length. Surface of valves con- 

 spicuously sculptured, exhibiting a very sharply marked areolation into com- 

 paratively wide polygonal meshes, ventral edges in the greater part of their 

 length fringed with delicate spinules; right valve armed, just above the most 

 prominent part of the frontal margin, with a well marked, though rather small 

 dentiform process. Structure of the several limbs not exhibiting any pronounced 

 difference from that in the type species. Caudal lamellae somewhat resembling 

 in shape those in P. punctata, but having the anterior corner far less produced, 

 whereas the marginal processes between the claws are rather more fully developed. 



Male having the shell somewhat less high than in female, but otherwise 

 rather similar both in shape and sculpture. Left caudal lamella with the fore- 

 most claw very small and rudimentary, and the anterior corner not at all pro- 



5 Crustacea. 



