REPORT ON THE OSTRACODA. 175 



the width equal to somewhat more thau a third of the length ; extremities sharply 

 rounded and subequal, the front of the shell being but very little more compressed than 

 the hinder end ; end view ovate, widest in the middle, pointed above and below, width 

 equal to about two-thirds of the height. The surface of the shell is even, and covered 

 with small and rather closely-set impressed circular puncta. Length, l-30th of an inch 

 (•85 mm.). 



The specimens represented in figures e-g (from Station 167) may perhaps be referred 

 to the young of this species ; it is, at any rate, undoubtedly identical mth the types 

 described in the Zoological Transactions {loc. cit.) which were found in sponge-saud, 

 probably from the Levant. Should this supposition be upset by future observations, the 

 larger forms (figures a-cl) will require to be re-named. The valve sho-«ai in PI. XXXVL 

 fig. 6, is probably the same species, but Ul-grown and distorted. 



I have notes of the occurrence of this species in the following localities : — Ofi" 

 Nightingale Island (Tristan d'Acunha), 100 to 150 fathoms, rock and shells (Station 

 135); (?) Port Jackson, 2 to 10 fathoms; lat. 39° 32' S., long. 171° 48' E., 150 fathoms 

 (Station 167) ; off Ki Islands, 580 fathoms, mud (Station 191«.) ; sounding, 160 fathoms 

 (Station 305). 



[PI. XXXVL fig. 6, a, b. a Left valve seen from side, b from above. PL XLIV. 

 fig. 4, a-g. a Adult shell seen from left side, b from above, c from below, d from 

 front ; e young shell seen from left side, yfrom above, g from front. All magnified 

 40 diameters.] 



7. Cijtherella semitalis, G-. S. Brady (PI. XLIV. fig. 2, a-e). 



Cytlierella semitalis, Brady, Les Fonds de la Mer, torn. i. p. 72, jsl. viii. figs. 23, 24. 



Carapace compressed, oblong ; seen from the side, elliptical, equal in height through- 

 out ; extremities well rounded, the posterior somewhat oblique, dorsal and ventral 

 margins straight (or only slightly sinuated) and parallel, height equal to half the 

 length ; seen from above, the outline is ovato-cuneate, greatest width near the posterior 

 extremity, and equal to somewhat less than half the length ; the extremities are sub- 

 truncate, but rounded at the angles, the anterior much narrower than the posterior. 

 The surface of the shell is marked by a broad encircling belt of subangular excavations, 

 somewhat irregularly disjDosed, but leaving in the centre of each valve a smooth longi- 

 tudinal patch or track quite free from sculpturing ; this patch usually encroaches at some 

 points in a transverse direction upon the sculptured belt, and in some cases the shell 

 bears traces also of irregular transverse grooving. Length, l-45th of an inch ('54 mm.). 



The types of this very well-marked species were found in a sounding from the north 

 of Java. The Challenger specimens were found in dredgings from Booby Island, lat. 10° 

 36' S., long. 141° 55' E., 6 to 8 fathoms (Station 187) ; lat. 9° 59' S., long. 137° 50' E., 



