594 DR. G. S. BRADY ON THE OSTRACODA 
ovate, with wide projecting extremities. The valves have a rugose, tuberculated rib 
running diagonally across from before backward, and are otherwise irregularly sculptured 
in arugose manner. Length 315 inch (0-98 millim.). 
One specimen in the Trophon-bed (Sables supérieurs), one in the Panopwa-bed 
(Sables inférieurs), and one or two in the Jsocardium-bed (Sables moyens). 
In general aspect these specimens are rather like Cythere costata, Brady, but differ 
in their style of sculpture and in the fact of the postero-inferior angle being rounded 
off instead of being produced asin C. costata, with a dentate projection. 
CYTHERE SUBCORONATA, Speyer. (Plate LXVII. figs. 4 a—4 d.) 
Cythere subcoronata, Speyer, loc. cit. p. 38, pl. iv. fig. 9 (1863). 
? Cythere latidentata, Bornemann, “ Die mikroscop. Fauna des Septarienthones von Hermsdorf,” 
Zeitschy. d. deutsch. geol. Ges. 1855, p. 366, pl. xxi. fig. 6. 
? Cythere horrescens, Jones, Tertiary Entom. p. 38, pl. v. figs. 9, 17a, 176 (not Cythere horrescens, 
Bosquet ; nor Cythereis subcoronata, Brady, Trans. Zool. Soc. Lond. vol. v. p. 384, 1865). 
Carapace, as seen from the side, oblong, subovate, somewhat higher in front than 
behind; height equal to rather more than half the length; extremities rounded, the 
anterior armed below the middle with a series of strong, blunt, projecting spines, the 
posterior with a few broader and less developed somewhat triangular teeth ; dorsal 
margin sloping in an almost straight line, but tuberculated and terminating behind in a 
very large and much elevated blunt spine or tubercle ; ventral margin convex. Outline 
as seen from above subovate or almost hastate, irregularly jagged or laciniate, widest 
towards the hinder extremity, the width being equal to the height. End view sub- 
triangular. The surface of the valves is beset with irregularly scattered, large, rounded 
tubercles, and along the ventral and dorsal margins with a row of blunt tooth-like 
processes. Length 3/5 inch (0°98 millim.). 
Though Professor Jones’s figures differ, more especially in the sharply spinous 
character of the armature, from the Antwerp specimens, I think it extremely likely 
that they really apply to mere varieties (perhaps sexual) or to stages of growth of the 
present species. And I also strongly suspect that the species itself, as illustrated in 
Pl. LXVII. figs. 2a-d of this Memoir, may only be the immature form of Cythere 
mucronata, a strikingly developed specimen of which is shown in figs. 3 a—d of the 
same Plate. If the two series of figures be carefully compared, it will be seen that 
they differ scarcely at all, except in the degree of development of the various parts ; 
and though I hesitate, in the absence of a series of specimens exhibiting the inter- 
mediate stages of growth, to unite them under one specific name, I really entertain 
very little doubt as to the propriety of doing so. 
C. subcoronata has been found sparingly in the Pectunculus-bed (Sables inférieurs) 
and in the zone a Jsocardium (Sables moyens). 
