24 TERTIARY ENTOMOSTRACA OF ENGLAND. 



smaller, neater, and closer punctation. Thougli more swollen, the surface is less 

 ridged, and hence we may term it var. j-^quior. 

 Weybourn Crag. (Mus. Pract. Geology.) 



18. Ctthere Harrisiana, Jones. Woodcut, fig. 2. 



Ctthebeis intebetjpta, Jones. Monogr. Cretac. Eiitom., 1849, p. 16, pi. ii, fig. 6. 

 Cttheee Hareisiana, Jones. Geol. Mag., 1870, pp. 75, 76 ; and 18S7, p. 452, 



woodcut, fig. 1. 



This was found, as a Tertiary fossil, with C. sjnnifemma, hereafter described, 

 while looking over some washings of London Clay for a second time. We have 



Fig. 2.- — Cytliere Harrisiana, Jones. Eiglit valve. From the London Clay. Magnified 20 diani. 



only this one valve, which agrees so closely in every particular with valves from 

 the Gault, presenting the same isolated prickles and the pursed-up posterior end 

 with its flattened margin, that we cannot separate them. 



Prom Piccadilly, London ; collected by Messrs. Sherborn and Chapman. 

 (British Museum.) 



19. Cythere dictyosigma, Jones. Plates III, figs. 8 a, h. 



From the Crag. This was not figured in the 'Monogr. Tert. Entom.,' 1857, 

 p. 30. (British Museum.) 



20. Cythere trachypora, Jones. Plate III, figs. 9 a, b. 



Cttheee teachtpoea, Jones. Monogr. Tert. Eutom., 1857, p. 36, pi. iii, figs. 



9/—?: ; Geol. Mag,, 1870, p. 156. 



The insides and edges only of the valves wore shown in the ' Monogr.,' 1857 ; 

 the outside is now figured. Several individuals from the Suff"olk Crag have the 

 marginal swellings much more definite and ridge-like than in Mr. C. Reid's specimen 

 from the Norwich Crag here figured. We may remark that some of Dr. G. S. 

 Brady's illustrations of his Cythere mutahilis, ' Trans. Zool. Soc.,' 1866, p. 377, 

 pi. lix, figs. 14/, g, approach very near to C. trachyjiora. (British Museum.) 



