REPORT ON THE OSTRACODA. 137 



stated. In shape this is almost exactly similar to Cytheropteron latissimum (Norman), 

 a northern species, yet the absence of any but very faint sculpturing of the shells seems 

 to preclude the possibility of uniting it with that species. 



[PL XXXIV. fig. 4, a-d. a Shell seen from left side, h from above, c from below, 

 fZfrom front. Magnified 50 diameters.] 



3. Cytheropteron (?) angustatum, n. sp. (PL XXXIV. fig. 5, a, h). 



Valves, seen from side, oblong, subrhomboidal, higher in front than behind, height 

 equal to more than half the length ; anterior extremity broad, rounded below the middle, 

 thence sloping almost in a right line to the dorsum, posterior extremity narrower, evenly 

 rounded, dorsal margin short, straight, abruptly angidar at both ends, ventral gently 

 convex, slightly sinuated in front, and bent upwards behind ; seen from above, the 

 outline is regularly ovate, without any alseform proportion. Shell-surface marked with 

 numerous moderately large angular excavations. Length, l-50th of an inch ("5 mm.). 



The proper generic position of this shell must be considered doubtful ; it may possiljly 

 be a young undeveloped form, but as specimens have been found in two widely distant 

 localities, it seems best to give it, provisionally, a specific name. Possibly the genus 

 Cythere might have been a more fitting receptacle in this case, but from a few detached 

 valves only it is not easy to arrive at an accurate conclusion. The specimens were found 

 at Balfour Bay, Kerguelen Island, 20 to 50 fathoms (Station 149), and Torres' Straits, 

 lat. 11° 35' S., long. 144° 3' E., 155 fathoms (Station 185). 



[PL XXXIV. fig. 5, a, b. a Left valve seen from side, b from above. Magnified 50 

 diameters.] 



4. Cytheropteron intermedium, G. S. Brady (PL XXXIV. fig. 1, a~d). 



Cytheropteron intermedium, Brady, Ostracoda of the Antwerp Crag (Trans. Zool. Soc, 1878), 

 p. 403, pL Ixix. fig. 3, a-c. 



Shell elongated ; seen from the side, flexuous, subrhomboidal, depressed in front, 

 highest near the middle, height equal to more than half the length ; anterior extremity 

 obliquely rounded, posterior produced above the middle into a smaU, slender beak, below 

 which it looks do^vnwards with an oblique gentle curve, dorsal margin moderately arched, 

 ventral sinuated in front, convex behind the middle ; seen from above, the outline is 

 hastate, widest behind the middle where the lateral alse project at an obtuse angle ; from 

 this point the lateral margins converge in a gentle curve towards the front, terminating 

 in a produced subacuminate extremity; backwards the sides converge at first almost 

 rectangularly, then more gradually, the posterior extremity being, like the anterior, 

 subacute ; end view equilaterally triangular, obtusely rounded at the apex, lateral angles 

 produced and truncated, sides gently convex. Shell almost smooth ; ventral surface 

 slightly nodulated and irregular. Length, 1-5 0th of an inch ('5 mm.). 



(zool. chall. EXP. — PAET ui. — 1880.) C IS 



