32 



in the subsequent work published by him in connection with Norman, are 

 unquestionably referable to the present species. 



Occurrence. This peculiar little Ostracod is by no means rare off the coast 

 of Norway. I have taken it in many different places, both on the south and 

 west coasts, from the Christiania Fjord at least to Trondhjem. It generally 

 occurs at moderate depths ranging from 6 to 20 fathoms, on a sandy bottom 

 covered with a thin layer of mud. The animal moves rather lively along the 

 bottom in a peculiar manner reminding somewhat on that of some Lynceidae 

 (Chydorus sphcericus). During the swimming the slender natatory setae attached 

 to both pairs of antennae and to the outer ramus of the maxillae are seen 

 projecting from the shell anteriorly as dense diverging fascicles, which are 

 moved rapidly in a vertical plane, as in the Cypridce. When disturbed, the 

 animal at once withdraws its swimming appendages within the shell, the 

 valves of which then become firmly closed. 



Distribution. British Isles (Brady). 



2. Polycope punctata, G. O. Sars. 



(PI. XV, fig. 2). 



Polycope punctata, G. O. Sars, Nye Dybvandscrustaceer fra Lofoten. 

 Chr. Vid. Selsk. Forh. 1819, p. 171. 



Specific Characters. Female. Shell, seen laterally, resembling in shape 

 that of the preceding species, though having the margins somewhat more 

 regularly curved; seen dorsally, very broad, the greatest width attaining 3 Ai 

 of the length. Surface of valves sculptured with densely set and rather con- 

 spicuous pits, but without any trace of a reticulation. Anterior antennae less 

 densely hairy than in the preceding species, with the penultimate joint com- 

 paratively larger. Mandibular palp with the posterior lobe of the proximal 

 joint somewhat more prominent, and the distal joint broader, almost quadrang- 

 ular in shape; exopodal appendage only provided with a single thickish seta, 

 another small, but distinctly ciliated seta issuing just behind it from the outer 

 distal corner of the joint. Structure of the limbs otherwise very like that in 

 the preceding species. Caudal lamellae however somewhat dissimilar, being 

 more triangular in shape, with the lover edge almost straight and the anterior 

 corner rather produced; claws, as in P. orbicularis, 7 in number on each 

 lamella, intercurring projections of the margin, however, much smaller than 

 in that species. 



Male closely resembling the female in its outward appearance, though 

 of somewhat smaller size. Left caudal lamella with the anterior comer not at 



