CYTHERIDEA. 39 



8. Cytheridea puxNCTILLATA, Brady. Plate I, fig. 2. 



One damaged valve from the "Norwich Crag" at Southwold we refer to this 

 species, which has been described and figured in full in the ' Monogr. Post- 

 Tertiary Entom.,' 1874, p. 177, pi. vi, figs. 1—11. Our specimen, however, 

 approaches most closely to another figure of the same species in Dr. G. S. Brady's 

 paper, ' Trans. Linn. Soc.,' vol. xxvi (1868), p. 424, pi. xxvi, fig. 36. 



This species is not rare in the Post-Tertiary Beds and the northern seas. 

 (British Museum.) 



9. Cythbridea perforata {Boemer). Plate I, fig. 14. 



Cttheeidea peefouata, Jones. Monogr. Terfc. Eutom.,i 1857, pp. 44, 45, pi. iv, 



figs. 14 a—e (? d, e, young) ; Geol. Mag., 

 1870, pp. 74 and 157 ; J. and S., Geol. Mag., 

 1887, p. 445. 



The specimen now figured is like fig. 14 a, pi. 4, in the ' Monogr.,' 1857, but 

 is rather less triangular, much more coarsely punctate, and strongly marked at 

 the anterior hinge. It was found, with numerous normal valves, in some washmgs 

 of the clay from Barton, Hants. This species is known also from the Ohgocene 

 Sands at Colwell Bay, the London Clay, the Eocene Beds of the Paris Basin, and 

 from some Cretaceous formations of England and the Continent. (Brit. Mus.) 



9*. Cytheridea perforata, var. insignis, Jones. 



Ctthehidka pebfoeata, var. instgnis, Jones. Monogr. Tert. Entom., 1857, p. 46, 



pi. vi, fig. 3 ; J. and S., Geol. Mag., 1887, p. 455. 

 pi. xi, fig. 12. 



A figure of this fine variety, from the London Clay of Copenhagen Fields, was 

 reprodu^'ced in the ' Geol. Mag.' from the original Monograph. (British Museum.) 



10. Cytheridea glabra, Jones. 



CxTHEEiDEA PEEFOEATA, var. GLABEA, Joues. Monogr. Tert. Entom., 1857, p. 46, 



pi. V, fig. 24. 

 — Q-Li.^Vi.K, Jones S{ Sherhorn. Geol. Mag., 1887, p. 455, pi. xi, fig. 13. 



1 This species is not like Bairdia suUrigona, Bornemann, as quoted at p. 45 of the Monograph. 



