REPORT ON THE OSTRACODA. 37 



above regularly ovate, widest near, or a little in front of, the middle, and tapering 

 equally toward both ends ; extremities acuminate, width equal to one-thii'd of the 

 length ; end view ovate. Surface of the shell smooth and polished, white or cream- 

 coloured, and bearing often a few minute impressed puncta. Length, l-50th of an inch 

 ("5 mm.). 



Found in a dredging from off Bermudas (Station 33), 435 fathoms; mud. These 

 specimens, though considerably smaller than those met with in Europe, present no other 

 important difference. I suppose, therefore, that the conditions of a tropical sea are not 

 so ffxvourable to the species as those of temperate regions. Possibly the same observa- 

 tion may hold good if applied to the whole genus. Fontocypris tngonella is a common 

 species in Northern Europe, and has been noticed also in dredgings from the Mediter- 

 ranean and Cape Verde. It occurs not unfrequently in the Post-Tertiary deposits of 

 Scotland. 



[PI. XV. fig. 4, a-cl. a Carapace seen from left side, h from above, c from below, 

 d from front. All magnified 60 diameters.] 



2. Pontocypris siinplex, n. sp. (PI. I. fig. 5, a-d). 



Carapace compressed, elongated ; seen from the side, subreniform, higher in front than 

 behind ; greatest height situated in the middle, and equal to half the length ; anterior 

 extremity broadly and obliquely rounded, posterior rounded but considerably narrowed ; 

 dorsal margin boldly arched, highest near the middle ; ventral sinuated in front of the 

 middle ; seen from above the outline is ovate, widest a little in front of the middle ; 

 extremities subacuminate, wddtli equal to somewhat more than one-third of the length ; 

 end view ovate, rather compressed towards the dorsal margin ; surface of the valves quite 

 smooth. Length, l-38th of an inch ("66 mm.). 



Dredged in a depth of 7 fathoms off Ascension Island. 



[PI. I. fig. 5, a-d. a Carapace seen from left side, h from above, c from below, d from 

 front. Magnified 50 diameters.] 



3. Pontocyp>ris faha (?), Pieuss (PI. I. fig. 4, a-d). 



Balnlia faha, Eeuss, Eiii Eeitrag zur genaueren Kenntniss der KreidegebilJe ]Meklenburg.s, 



Zeitsck d. deutsch. Geol. Ges., 1855, p. 278, pi. x. lig. 2. 

 Pontocypris faha, Brady, Ostoacoda of the Antwerp Crag, Trans. Zool. Soc, 1878, p. 382, pi. Ixiii. 



fig. 6, a-e. 



Carapace of the female rather tumid ; seen from the side subtriangular, highest in front 

 of the middle, the height being equal to more than half the length ; anterior extremity 

 very broadly rounded, posterior much attenuated and almost acuminate ; dorsal margin 

 very boldly arched, highest in front of the middle, sloping with a steep curve backwards, 

 and more gently towards the front ; ventral rather deeply sinuated in the middle ; seen 



