REPORT ON THE OSTRACODA. 127 



moderately arched, inferior slightly siuuated in front ; seen from above the outline is 

 ovate, tapering only slightly towards the extremities, scarcely pointed in front, rounded 

 behind ; the width, which is greatest about the middle is j ust equal to the height ; end 

 view nearly circular. Surface of the shell perfectly smooth. Length, l-52d of an inch 

 (■49 mm.). 



The following are the dredgings in which Xestoleheris curta has been noticed : — Off 

 Bermudas, 435 fathoms, mud (Station 33) ; Royal Sound, Kerguelen Island, 28 fathoms 

 (Station 149) ; Port Jackson, Australia, 2 to 10 fathoms ; off Booby Island, lat. 10° 36' S., 

 long. 141° 55' E. ; 6 to 8 fathoms (Station 187) ; off reefs at Honolulu, 40 fathoms ; in 

 lat. 33° 42' S., long 78° 18' W. ; 1375 fathoms (Station 300). The type-specimen 

 described in the Zoological Society's Transactions (loc. cit.) was from the West Indies, 

 and differs in no important respect from those here described, though the measurement is 

 somewhat larger — l-42d of an inch. 



[PI. XXXI. fig. 6, a-cl. a Carapace seen from left side, h from above, c from below, 

 d from front. Magnified 50 diameters.] 



7. Xestoleheris 23olita, G. S. Brady (PI. XXXI. fig. 7, a-c). 



Xestoleheris polita, Brady, Les Fonds de la Mer, torn. i. p. 202, pi. xxvii. figs. 15, 16. 



Carapace as seen from the side, pear-shaped, highest behind the middle ; anterior 

 extremity narrow, posterior broad, both well rounded, dorsal margin moderately arched, 

 inferior straight or slightly convex, height equal to two-thirds of the length ; seen from 

 above, compressed, ovate, narrowed, and obtusely pointed in front, somewhat broader 

 and rounded behind ; width rather less than the height ; end view nearly circular. 

 Surface of the shell smooth, very sparingly papillose. Length, 1-5 2d of an inch 

 (•49 mm.). 



The Challenger specimens of this species were found in mud brought up on the 

 anchor from a depth of 6 fathoms in Stanley Harbour, Falkland Islands (Station 316). 

 The type-specimens were taken in a locality not very far distant — Halt Bay, Straits of 

 Magellan. 



[PI. XXXI. fig. 7, a-c. a Carapace seen from left side, h from below, c from front. 

 Magnified 50 diameters.] 



8. Xestoleheris margaritea, G. S. Brady (PI. XXX. fig. 2, a-g). 



Cytheridea margaritea, Brady, Trans. Zool. Soc, 1865, vol. v. p. 370, pi. Iviii. lig. 6, a-d. 

 (?) Oytherina ovulum, Reuss, Haidinger's Abhandl., Band iii. p. 55, pl. viii. fig. 19. 



Carapace of the female, tumid ; seen from the side, ovate, greatest height situated 

 behind the middle, and equal to two-thirds of the length ; extremities evenly rounded, 

 dorsal margin moderately arched, ventral sHghtly sinuated in front of the middle ; seen 



