26 



Lofoten islands, where it occurred, together with C. elegans, at the consider- 

 able depth of 250 300 fathoms. I have subsequently taken it occasionally in 

 the greater deeps of the Christiania Fjord, at Vall0 and Hank0, and it has 

 also been recorded by Norman from the Trondhjem Fjord. 



Distribution. West coast of Sweden (Skogsberg), Arctic Ocean (Aurivil- 

 lius), Labrador current (Vavra). 



9. Conchoecia obtusata, G. O. Sars. 



(PI. XIII, fig. 2). 

 Conchoecia obtusata, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 118. 



Specific Characters. Female. Shell, seen laterally, oblong oval in shape, 

 and scarcely broader behind than in front, greatest height about in the middle 

 and nearly attaining half the length, dorsal margin perfectly straight and hori- 

 zontal, ventral margin evenly arcuate throughout, posterior extremity narrowly 

 rounded and somewhat prominent in the middle; upper posterior corner rather 

 slight and quite unarmed; seen dorsally or ventrally, narrow oblong in out- 

 ine, greatest width behind the middle and somewhat exceeding Vs of the 

 length. Rostral prominences of moderate size and somewhat deflexed, subjacent 

 sinus comparatively narrower than in the 2 preceding species. Surface of 

 valves nearly smooth, though a slight concentric striation may be discerned in 

 their marginal parts. Structure of the several appendages very little different 

 from that in the 2 preceding species. 



Male much smaller than female, and having the shell comparatively 

 shorter and stouter. Frontal tentacle with a well defined capitulum. Foremost 

 apical seta of the anterior antennae, as in the male of C. borealis, abruptly 

 bent near the end, and having the middle part somewhat thickened, but only 

 armed with scattered very small and simple spinules; posterior sensory appen- 

 dage distinctly flexuous. Hook on the inner ramus of right posterior antenna 

 of quite an extraordinary size, and exhibiting at some distance from the base 

 an abrupt elbow-like bend, its outer part forming on the middle another 

 though more even curvature; that on the left antenna, as usual, much reduced 

 in size. Copulatory appendage comparatively larger than in either of the 2 

 preceding species, but otherwise of a very similar appearance. 



Colour of female specimens whitish grey, with a pale yellow tinge. 



Length of adult female amounting to about 2 mm.; that of male only 

 to 1.40 mm. 



Remarks. This form cannot be confounded with any of the 2 preceding 



