REPORT ON THE OSTRACODA. 177 



10. Cijtlierdla cammosa, G. S. Brady (PI. XXXVI. fig. 5, a-d). 



Ctjtherella cavernosa, Brady, Les Fonds de la Mer, p. 65, pL viii. figs. 13, 24. 



Carapace compressed, cuneiform ; seen from the side quadrangular, equal in height 

 throughout ; height equal to nearly two-thirds of the length ; anterior extremity some- 

 what flattened, rounded ofi:' at the angles, posterior subtruncate, abruptly rounded at the 

 angles and siuuated in the middle, dorsal and ventral margins parallel, the former nearly 

 straight, the latter slightly sinuated ; seen from above elongated cuneate, widest behind ; 

 anterior extremity obtusely pointed, bimucronate, posterior truncated, slightly muerouate 

 in the middle, width equal to rather more than one-third of the length ; end-view 

 irregular, ovate, much higher than broad. The surface of the valves is marked liy 

 irregularly-disposed flexuous rounded ridges, the two principal ones running nearly 

 parallel to each other for about three-fourths of the length of the shell from its anterior 

 margin, one near the middle, the other between it and the ventral margin ; there are also 

 several smaller ridges running transversely across the longitudinal ridges towards the 

 posterior and upper margins of the shell, the interspaces being marked with closely-set 

 minute punctures. Length, l-34th of an inch (75 mm.). 



The type specimens of Cytherella cavernosa were from Java ; those got during the 

 Challenger Expedition were dredged ofl' East Moncoeur Island, Bass' Strait, in 38 to 40 

 fathoms (Station 162), and off Booby Island, lat. 10° 36' S., long. 141° 55' E. ; 6 to 8 

 fathoms (Station 187). 



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

 d from front. All magnified 40 diameters.] 



11. Cytherella cingulata, G. S. Brady (PI. XLIII. fig. 1, a-g, and fig. 2, a-d). 



Cytherella cingulata, Brady, Les Fonds de la Mer, torn. i. p. 159, pi. xvii. figs. 24, 25. 



Carapace oblong, irregularly cuneiform ; seen from the side subquadrangular, equal in 

 height before and behind, anterior extremity well rounded, posterior rounded and some- 

 what produced in the middle, obtusely angulated at its junction with the dorsal and 

 ventral margins ; dorsal margin straight, or nearly so, ventral rather deejjly sinuated in 

 the middle ; seen from above, the outline is irregularly cuneiform, widest at the posterior 

 extremity where the width (in the female) equals nearly half the length ; the anterior 

 extremity is wide, subtruncate, the inner edges of the valves projecting in a bimucronate 

 manner ; posterior extremity truncated and rounded, crenulated ; the lateral margins are 

 doubly sinuated, with a central boss-like prominence ; end-view quadrangular, height (in 

 the female) not much greater than the width, angles rounded. Surface of the shell more 

 or less rugose and pitted, the edges of the valves much thickened and raised into a broad 

 rounded ridge which runs round, and just within, the anterior, superior and inferior 

 margins and terminates behind in a prominent rectangular elevation. The proportions of 



(ZOOL. CHALL. EXP. PART IfT. 1880.) C 23 



