274 



61. CYTHERELLA FULLONICA, sp. 11. 



PI. i., figs. 12 a,b, c. 



Sub-oblong, compressed, with a faint median sulcus, slightly 

 incurved on the ventral, and somewhat angular on the dorsal 

 margin, symmetrically rounded anteriorly; contracted posteriorly. 

 Surface smooth, muscle-mark unusually distinct, in the ordinary 

 shallow depression. 



This approaches C. pulchra, G. S. Brady {Trans. Zool. Soc, 

 vol. v., 1866, p. 361, pi. Ivii., fig. 5), in general appearance, but 

 its ventral incurve is more marked, and the postero-dorsal 

 margin has a stronger angle and slope. The dorsal process is 

 analogous to that seen in C. dromadaria, G. S. Brady (Challenger 

 Report, 1880, p. 173, pi. xliii., fig. 6), but is very rare in Cytherella. 

 C. Leopolilana, Eeuss (Denkschr. L Ah. Wiss., Wien, vol. vii., 

 1854, p. 140, pi. xxvii, fig. 4), has projections on both upper and 

 lower margins. 



Four examples from the Blue, and four from the Yellow 

 Fullers-earth Clay, Midford. We have also seen three similar 

 valves, but with the dorsal process obsolete or nearly so, in the 

 small collection of Ostracoda sent to us by Mr. E. A. Walford, 

 and collected at the base of the Fullers-earth Oolite between 

 Notgrove and Bourton. 



62. CYTHERELLA CATENULATA, Sp. 71. 



PI. v., figs. 6 a, b, c. 



This Cytherella, of the usual oblong outline, with rounded ends 

 and slightly incurved ventral region, has an irregularly wavy 

 surface, very clearly seen in the edge view. The surface is 

 ornamented with a neatly regular concentric reticulation, the 

 elongated meshes of which assume a chain-like appearance. 



Nine examples from the Blue, and one from the Yellow 

 Fullers-earth Clay, Midford. We have also received one specimen 

 from the base of the Fullers-earth Oolite between Notgrove and 

 Bourton, from Mr. E. A. Walford, F.G.S. 



