RErORT ON THE OSTRACODA. 35 



seen from above, compressed, subulate, widest in tbc, middle, and tajun-ing evenly to the 

 extremities, which are acuminate, width equal to aliout one-third of the length ; end 

 view subcircular, the right valve greatly overlapping the left. Surface of the shell 

 perfectly smooth ; length l-37th of an inch ('GS mm.). 



Found in a haul of anchor-mud, from a depth of 6 fathoms, in Stanley Harljour, 

 Falkland Islands. Station 316. 



The very great inequality of the two valves of this and the following species may 

 possibly indicate a distinct generic rank, but without the means of examining anatomical 

 details, the point must for the present be left undecided. The larger valve, in this case, 

 is the right ; in Bairdia, where a like inequality exists, the left valve is the large one. 



[PI. XXX. fig. 7, a-d. a Shell seen from left side, h from above, c from below, 

 d from front. Magnified 60 diameters.] 



4. Aglaia (?) ohtusata, n. sp. (PL XXX. fig. 8, a-d). 



Shell tumid, subovate, right valve much larger than the left ; seen from the side, 

 subreniform, slightly depressed in front ; extremities well rounded, the posterior much 

 wider than the anterior ; dorsal margin moderately arched, highest in the middle, ventral 

 nearly straight, height equal to half the length ; outline as seen from above, ovate, 

 acuminate in front, broadly rounded behind, greatest width ecj^ual to the height, and 

 situated in the middle, whence the margins converge quickly towards the front, but 

 scarcely at all backwards ; end view subcircular, sides unequal. Surface Cjuite smooth. 

 Length, l-45tli of an inch ("54 mm.). 



Dredged in Balfour Bay, Kerguelen Island, in a depth of 20 to 50 fathoms. Station 

 149. 



[PI. XXX. fig. 8, a-d. a Shell seen from the left side, h from above, c from below, 

 d from front. Magnified 60 diameters.] 



Pontocypris, G. 0. Sars. 



Pontocypris, G. 0. Sars, Oversigt af !N"orges marine Ostrac, 1865. 



Shell thin and fragile, higher in front than behind. From the first joint of the seven- 

 jointed anterior antennae spring two short setae, one seta from each of the four following- 

 joints, four from the sixth, and four from the seventh, those of the last joint being much the 

 longest ; last joint of the posterior antenna bearing four long terminal claws ; to the side of 

 the second joint is attached a pedicellated vesicle, and to its apex a brush of about five setse, 

 the longest of which do not much overreach the apices of the terminal claws. Mandil^les 

 slender, di\dded into several curved teeth, and bearing near the aj)ex a long ciliated seta ; 

 palp robust, the basal joint large, and bearing a branchial appendage, last joint short and 

 spinous. External segment of the first pair of maxillse very large, the rest very short 



