REPORT ON THE OSTRACODA. 59 



•any other, but requiring further investigation with the help of a larger series of 

 specimens. 



[PL XL fig. 2, a-e. a Carapace seen from left side, h from right side, c from above, 

 d from below, e from front. Magnified 50 diameters.] 



18. Bairdia attenuata, n. sp. (PL XL fig. 3, a-e). 



Carapace compressed, seen from the side, subtriangular ; height equal to more than 

 half the length ; anterior extremity oblique, rounded off below, but obtusely angular 

 above ; posterior extremity narrowed and produced into a tapering beak ; dorsal margin 

 boldly arched in the middle, sinuated towards each extremity, ventral slightly convex ; 

 dorsal outline compressed, lozenge-shaped, twice and a half as long as broad, mdest in 

 the middle, extremities acuminate ; end view ovate, tapering towards the dorsum ; width 

 equal to two-thirds of the height ; surface of the shell marked with small and closely -set, 

 circular, imjDressed punctures. Length, l-30th of an inch ("85 mm.). 



Found only in a dredging from Torres Straits, lat. 11° 35' S., long. 144° 3' E., 155 

 fathoms, sand (Station 185) ; and ofi"the reefs at Honolulu, in a depth of 40 fathoms. 



The compressed form, taken together with the other characters, abundantly dis- 

 tinguishes this from all other known species. 



[PL XL fig. 3, a-e. a Carapace seen from left side, b from right side, c from above, d 

 from below, e from front. Magnified 50 diameters.] 



19. Bairdia fortificata, n. sp. (PL XL fig. 4, a, h). 



Valves as seen from the side, oblong, subquadrate ; height equal to somewhat more 

 than half the length ; extremities broad, rather oblique, moderately rounded, and fringed 

 each with nine or ten short, blunt teeth ; dorsal margin gently arched ; ventral nearly 

 straight ; outline, as seen from above, ovate, widest in the middle ; surface of the shell 

 sculptured with numerous closely-set subrotund excavations of moderate size. Length, 

 1-2 3d of an inch (I'l mm.). 



Only one specimen of this species, the valves of which, unfortunately, separated before 

 it could be drawn, was found in a dredging made, in a depth of 6 to 8 fathoms, off Booby 

 Island, lat. 10° 36' S., long. 141° 55' E. (Station 187). 



[PL XL fig. 4, a, h. a Left valve seen laterally, h the same from above. Magnified 

 50 diameters.] 



20. Bairdia angidata, G. S. Brady (PL XL fig. 5, a-d). 



Bairdia angidata, Brady, Les Fonds de la Mer, torn. i. p. 199, pi. xxvii, figs. 11, 12. 



Carapace oblong, compressed ; seen from the side, subreniform, scarcely twice as long 

 as high ; extremities well and evenly rounded ; the anterior bearing about the middle a 



