OSTRACODA. 375 



margaritea, but Professor BRADY says he cannot distinguish them from our native 

 Xestolebris aurantia. 



Xestolebris variegata, BRADY. 

 In the general washings, and in washings from Cheval pearl oysters. 



Xestolebris faveolata, BRADY. 

 In a dredging from Karativo Paar, 6 to 10 fathoms. 



Xestolebris squamigera, n. sp. Plate I., figs. 23 to 25 ; Plate II., figs. 28 and 29. 



Shell seen from the side somewhat siliquose, two and a half times longer than 

 broad. Anterior extremity very narrow, rounded, posterior subacute ; dorsal margin 

 boldly arched, highest a little behind the middle, sloping rapidly and evenly to the 

 anterior end ; posteriorly the slope is more abrupt and almost truncate ; ventral 

 margin nearly straight, slightly sinuated in front of the middle ; seen from above the 

 outline is broadly ovate ; width about three-fifths of the length, and widest behind 

 the middle ; anterior extremity subacute, distinctly sinuated, and expanding rapidly ; 

 posterior extremity broadly rounded ; seen from the posterior end the valves are 

 deeply concave ; valves slightly unequal ; shell smooth, white and polished, with 

 numerous whitish spots scattered over the surface ; size, 0'52 millim. 



In the general washings and in washings from Gulf of Manaar sponges. The 

 drawings on Plate I. represent an ova-bearing female ; the autennule and antenna are 

 shown on Plate II., figs. 48 and 49. 



Xestolebris irrasa, n. sp. Plate II., figs. 5, 6 and 46, 47. 



Shell seen from the side ovate, height fully two-thirds of the length ; anterior 

 extremity narrow, posterior broad, both well rounded ; dorsal margin boldly arched, 

 highest in the middle, ventral very slightly convex, with slight sinuations at the 

 extremities ; seen from above ovate, widest behind the middle, width fully two-thirds 

 of the length, extremities obtusely pointed in front, wider and more rounded behind ; 

 surface of the shell marked with numerous concentric spinulose ridges, and clothed 

 with short stiff setae ; colour yellowish ; size, 0'53 millim. 



In the general washings and in washings from Gulf of Manaar sponges. The 

 figures represent a female shell, the antennule and antenna being shown by figs. 46 

 and 47. 



Xestolebris tumida, n. sp. Plate II., figs. 3 and 4. 



Shell seen from the side broadly pear-shaped, scarcely one and a half times longer 

 than broad, extremities well rounded, anterior much narrower than the posterior ; 

 dorsal margin greatly arched, highest behind the middle ; ventral slightly sinuated in 

 front and convex behind ; seen from above broadly ovate, rather longer than broad, 

 compressed and pointed in front, broadly rounded behind ; greatest width behind the 



