OF THE ANTWERP CRAG. 385 
rather convex, with a slight sinuation in the middle. Outline, seen dorsally, oblong, 
subpentagonal, widest near the posterior extremity; greatest width equalling half the 
length ; anterior extremity broad, subtruncate, and slightly emarginate in the middle : 
posterior tapering abruptly to a bifid submucronate point. End view broadly subtri- 
angular. Surface of the shell somewhat undulated and marked with impressed puncta, 
which are irregularly scattered and of various sizes, being larger towards the anterior 
and ventral margins, where they are arranged more or less regularly in the direction of 
longitudinal furrows. ‘The left valve is larger than the right; and the junction of the 
valves on the hinge-line is marked on the dorsal surface by a deep longitudinal 
depression. Length 35 inch (1:1 millim.). 
This species seems to be of rare occurrence, only one or two examples having been 
noticed in the zones “a Bryozoaires” and “ Jsocardium cor.” It approaches closely to 
Speyer’s Cythere millepunctata, with which I was at one time disposed to identify it: 
and I am not sure that Speyer’s figures may not represent the young form of the species. 
CYTHERE JURINEI, Miinster. (Plate LXV. figs. 2 a-2h.) 
Cythere jurinei, Von Minster, Jahrbuch fiir Mineralogie, &c., 1830, p. 60, et 1835, p. 445 
(fide Bosquet). 
Cythere jurinei, Rémer, op. cit. 1838, p. 516, pl. vi. fig. 12. 
Cythere jurinei, Bosquet, Entom. fossil. des terrains Tertiaires de la France et de la Belgique, p. 56, 
pl. ii. figs. 9a, b, c, d (1852). 
Cythere jurinei, idem, var. 8. tenuipunctata, op. cit. pl. ii. figs. 10, a, b, ¢, d. 
Cythere jurinei, Egger, Die Ostrak. der Miocain-Schichten bei Orenburg in Nieder-Bayern (1858) 
p. 20, pl. ii. fig. 5 (icones male), var. ovata, pl. iu. fig. 4. 
Cythere jurinet, Speyer, Die Ostrac. der Casseler Tertiirbildungen (1863), p. 15, pl. ii. fig. 5. 
? Bairdia semipunctata, Bornemann, “ Die wikroskopische Fauna des Septarienthones von Herms- 
dorf bei Berlin,” Zeitschrift d. deutsch. geol. Ges. 1855, p. 359, pl. xxi. fig. 1. 
Carapace, seen laterally, oblong, higher in front than behind, the greatest height being 
equal to half the length; anterior extremity obliquely rounded, posterior rounded, 
often much narrowed and produced; dorsal margin very gently arched, ventral slightly 
sinuated in the middle. Seen from above, the outline is oblong-ovate, tapering towards 
each extremity, the greatest width situated behind the middle. The surface of the 
shell is either quite smooth, or marked along the middle or on the lower half of each 
valve with small impressed puncta, usually faint and arranged in curved longitudinal 
furrows. The right valve is smaller than the left, and is abruptly sinuated at each end 
of the dorsal margin. Length 3; inch (1-1 millim.). 
Figs. e-h represent, as I believe, the adult form of the species, whereas an immature 
stage is shown in the figures a—d, which also seem to be identical with the var. B. tenui- 
punctata of M. Bosquet. It is not uncommon in recent Ostracoda to find the young 
marked with delicate sculpturing, which disappears in advanced age; the shape and 
