398 DR. G. S. BRADY ON THE OSTRACODA 
Cytherina miilleri, Romer, Neues Jahrb. fiir Mineralogie, 1838, p. 516. t. vi. fig. 6 (fide Jones and 
Brady) ; Reuss, Haidinger’s Abhandl. 1850, p. 55. pl. viii. fig. 21. 
Bairdia hagenowi, Reuss, Zeitsch. d. deutsch. geol. Ges. 1855, p. 60, pl. ix. fig. 93. 
Cytheridea heterostigma, Reuss, ibid. p. 60, pl. ix. fig. 94. 
Cytheridea miilleri, Bosquet, Entom. foss. terr. Tert. France, p. 39, pl. 11. fig. 4; Jones, Tert. Entom. 
England, p. 41, pl. v. figs. 4a-4c & 5, pl. vi. figs. 10a, 106, & 11-13; Egger, Die Ostrak. der 
Miocan-Schicht. Orenburg, p. 18, pl. 1. fig. 7; Speyer, Die Ostrac. der Casseler Tertiarbild. 
p. 48, pl. i. fig. 8; Brady, Trans. Zool. Soc. Lond. v. p. 371, pl. lviii. figs. 1la-d. © 
Cytherina intermedia, Reuss, Haidinger’s Abhandl. ii. p. 86, pl. xi. fig. 12. 
Cytherina seminulum, Reuss, ibid. p. 59, pl. ix. figs. 5-8. 
Carapace of the female subovate, tumid: seen from the side, ovate-triangular, highest 
a little in front of the middle; height equal to rather more than half the length; ante- 
rior extremity well rounded, posterior narrowed, obliquely rounded, and often somewhat 
exserted at the inferior part, forming a rounded obtuse angle; dorsal margin arched, 
usually more or less angulated in front of the middle; ventral margin nearly straight. 
Seen from aboye, ovate, sides subparallel, tapering abruptly to the extremities, width 
less than half the length. End view very broadly ovate. The surface is marked with 
numerous impressed rounded punctures, which often tend to arrange themselves in 
curved transverse furrows, and on the ventral surface to coalesce into longitudinal 
furrows; the margins are often entirely smooth ; but frequently the anterior border is 
armed below the middle with a row of six or eight sharp spines on each valve; the 
posterior extremity also sometimes bears a single spine at its lower angle; this is 
situated on the right valve. The shell of the male is, as usual, more compressed and 
elongated. Length 3'; inch (0°9 millim.), 
This is one of the most common species in the Antwerp beds, and has been found in 
all of them except the zone of Jsocardium cor.; it has also been found in most of the 
Tertiary formations of Europe, in Austria, Bohemia, Hesse, Westphalia, France, and 
the Netherlands (Eocene), in Touraine (Miocene) and in the Netherlands (Pliocene) ; 
it has also been noticed by Professor Rupert Jones in many of the Tertiary beds of 
England, and in a Tertiary Clay from Australia. I have myself seen recent specimens 
from Smyrna, the Levant, and Australia. 
Genus Loxoconcna, G. O. Sars. 
Valves nearly equal, subrhomboidal, and mostly flexuous in outline ; surface smooth, 
or marked with concentrically arranged impressed puncta; or with polygonal fosse, 
often also with minute circular papille; ventral margin usually forming a prominent 
compressed keel behind the middle; postero-superior angle obliquely truncate ; hinge- 
joint formed by two small teeth at the extremities of the hinge-line of each valve. 
Limbs of the animal slender and colourless. Upper antenne very slender, 6-jointed, 
the last joint very long, linear, and bearing long simple sete ; lower antennz 4-jointed, 
the third joint long and narrow. Flagellum long and biarticulate. Mandibular palp 
