REPORT ON THE OSTRACODA. 75 



The localities iu wliicli Cythere j-eussi was dredged are the following : — Off Booby 

 Island, lat. 10° 36' S., long. 141° 55' E., G to 8 fathoms (Station 187); off the reefs, 

 Honolulu, 40 fathoms; and Straits of Magellan, 55 fathoms (Station 313). The type- 

 specimens were from Colon-Aspinwall, and differ somewhat from those here described, in 

 being of more robust build and more strongly spinous. 



[PI. XIV. fig. 2, a-d. a Shell seen from left side, h from above, c from below, d from 

 front. All magnified 60 diameters.] 



23. Cythere fortijicata, n. sp. (PI. XXI. fig. 1, a-d). 



Carapace compressed, oblong ; seen from the side, quadrangular, not much higher in 

 front than behind, height equal to one-half the length ; anterior extremity rounded and 

 fringed with a row of short, blunt teeth, posterior obliquely truncated, rounded off and 

 fringed with a few short, almost obsolete teeth, below the middle ; dorsal margin sloping 

 greatly from the anterior extremity where it forms a gibbous elevation, slightly curved 

 behind the middle, and ending in a somewhat rounded angle ; ventral almost straight ; 

 seen from above, the outline is compressed, oblong, more than twice as long as broad, 

 widest in the middle, the sides gently convex and tapering evenly to the extremities 

 which are produced, obtuse and subtruncated ; end view broadly ovate ; the valves are 

 smooth, and encircled, except on the ventral margin, by a flattened flange of no great 

 width. Length, l-47th of an inch ("53 mm.). 



The only material which yielded this species was a sounding from a depth of 420 

 fathoms, in the Mid Pacific, about 38° S. latitude. 



[PI. XXI. fig. 1, a-d. a Shell seen from left side, h from above, c from below, d from 

 front. All magnified 60 diameters.] 



24, Cythere foveolata, n. sp. (PI. XIII. fig. 5, a-h). 



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

 situated in the middle and equal to more than half the length; extremities obliquely 

 rounded ; dorsal margin flattened in the middle, and sloping steeply to either extremity, 

 ventral sinuated in front and turned upwards at the back ; the shape as seen from above 

 is broadly ovate, scarcely twice as long as broad, with acutely pointed extremities and 

 very convex sides ; greatest width in the middle, whence the sides converge evenly 

 towards each extremity ; the posterior curve, however, broken by two small angTilar pro- 

 jections ; end view cordate, the apex corresponding with the dorsal, base with the ventral, 

 margin. Shell-surface marked all over with deep, closely-set, angular cavities ; hinge- 

 tubercles prominent. The outline of the male (figures e-h) is more compressed and very 

 much more angular. Length, l-45th of an inch ("53 mm.). 



Several specimens occurred in dredgings from off Christmas Harbour, Kergaielen 

 Island, 120 fathoms (Station 149) ; and off Heard Island, 75 fathoms (Station 151). The 



