CYPRIDINA. 45 



Oedee.— OSTRACODA, Latreille, 1801. 



I. Family. — Cypeidinad^e, Baird, 1850. 



1. Genus. — Cypeidina, Milne Edwards, 1838. 



Many recent forms belonging to this genus are known, and several others 

 have been described from the Chalk and the Carboniferous. The evidence of its 

 existence in the Devonian age given below is somewhat doubtful, on account of 

 the bad state of preservation of the specimens. 



1. Cypeidina ? sp. PL IV, figs. 10 a, 10 b, 10 c. 



Description. — Test broadly ovate or heart-shaped, widest in front. Anterior 

 side defective, apparently bearing a large beak, pinched in below, and slightly 

 damaged above, approaching that of Bradycinetus (one of the C ypridinadse) . 

 Dorsal edge boldly arched, without any thickening. Posterior margin narrowed, 

 meeting the ventral margin at a blunt angle, and there bounded by an undulating 

 rim or hem. Surface smooth, but showing traces of flexuous structure-lines, which 

 have a flaky appearance and a tendency to become frills towards the anterior end. 



Size. — 10 mm. in length. 



Locality. — Lummaton, a single defective specimen. 



Remarks. — This obscure, ovate and convex fossil, may possibly be a Cypridinad, 

 but the squamose condition at one end and the crenulated edge at the other 

 are unusual features in this group. The projection ends in a notch, but is 

 broken above and below. The linear markings upon the valve have a distant 

 resemblance to the annulated ornament seen in some species of Cyprella, 1 but they 

 are not so regular, and are not merely superficial. The absence of a tubercle also 

 separates it from that genus. The fossil is figured here in order to draw attention 

 to it should better specimens be found. At present there is doubt whether it is 

 an Ostracod at all. 



2. Cypeidina ? sp. PI. IV, figs. 6 a, 6 b, 6 c. 



Description. — Valve ovate, broadest and highest behind, flanged below (figs. 6 b 

 and c) as if overlapped on the ventral margin. Surface ornamented with super- 

 ficial punctations which are obscure and very minute. 



1 1874, Jones, Kirkby and Brady, ' Monogr. Carbonif. Cyprid.,' Pal. Soc, p. 40, pi. 4, figa. 13 

 and 17. 



