REPORT ON THE OSTRACODA. 117 



1. Loxoconcha avellana, Gr. S. Brady (PI. XXVIII. fig. 1, a-f). 



Normania avellana, Brady, Trans. ZooL Soc, voL v. (1865), p. 382, pi. Ixi. fig. 15, a-c. 



Carapace of the female, as seen from the side, flexuous, broadly pear-shaped, higher 

 behind than in front, greatest height in the middle, and equal to two-thirds of the 

 length ; anterior extremity depressed, rounded, posterior broadly rounded and emarginate 

 at the upper angle ; dorsal margin excessively arched, almost gibbous, ventral deeply 

 sinuated in front of the middle ; seen from above, the outline is broadly ovate, scarcely 

 twice as long as broad, widest in the middle and tapering evenly to the extremities, 

 which are pointed ; end view broadly ovate, obtusely subangular at base and apex, height 

 rather greater than the width. Surface of the shell marked with distant, concentrically 

 arranged circular pits, which on the ventral surface run together so as to form beaded 

 longitudinal grooves. The shell of the male (figures e,f) is longer and not so strongly 

 arched dorsally. Length of female, l-42d of an inch ("6 mm.). 



Dredged at Port Jackson, Australia, in a depth of 2 to 10 fathoms ; and off Tonga- 

 tabu, 18 fathoms (Station 172). 



The single specimen from which the species was first described was got in the West 

 Indies. 



[PL XXVIII. fig. 1, a-f. a Carapace of female seen from left side, 6 from above, 

 cfrom below, cZfrom front; e male seen from left side, /from below. Magnified 50 

 diameters.] 



2. Loxoconcha honoluliensis, n. sp. (PI. XXVIII. fig. 6, a-f). 



Carapace of the female, seen from the side, flexuous, subrhomboidal, highest behind 

 the middle, height equal to two-thirds of the length, anterior extremity broad and well- 

 rounded, posterior oblique, produced above the middle into a very broad, truncated 

 beak ; dorsal margin flattened in front, convex behind ; ventral sinuated in front of the 

 middle, strongly convex and keeled behind ; seen from above, the outline is lozenge- 

 shaped, widest in the middle, thence tapering without much curve to the extremities 

 which are subacuminate, width equal to more than half the length ; end view very 

 broadly ovate. Surface of the shell marked with distant circular punctures, or irregularly 

 reticulated. The shell of the male (figures a-d) is, as usual, more compressed and less 

 strongly arcuate dorsaUy. Length, l-42d of an inch ("6 mm.). 



Dredged in 40 fathoms off the reefs, Honolulu. A very well-marked species, dis- 

 tinctly characterised by the large beak-like projection of the posterior dorsal angle and 

 the very pronounced keeled convexity of the ventral surface. The two forms represented 

 in the plate, besides sexual differences of shape, are somewhat different also in style of 

 sheU-sculpture, the one being distinctly reticulated, the other marked merely with 

 distinct circular impressions. Should these characters prove to be constant, we could 



