24 TERTIARY ENTOMOSTRACA OF ENGLAND. 



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

 ridged, arid hence we may term it var. mqxsiou. 

 Weybourn Crag. (Mus. Pract. Geology.) 



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



Cythebeis intebrttpta, Jones. Monogr. Cretac. Entom., 1849, p. 16, pi. ii, fig. 6. 

 Cythere Harbisiana, Jones. Greol. Mag., 1870, pp. 75, 76 ; and 1887, p. 452, 



woodcut, fig. 1. 



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

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



Fig. 2. — CytJiere Harrisiana, Jones. Eight valve. From the London Clay. Magnified 20 diam. 



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. 



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

 (British Museum.) 



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



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

 p. 30. (British Museum.) 



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



Cytiiebe teachypoba, Jones. Monogr. Tert. Entom., 1857, p. 36, pi. iii, figs. 



9f—i; Geol. Mag., 1870, p. 156. 



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

 the outside is now figured. Several individuals from the Suffolk 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 mutabilis, ' Trans. Zool. Soc.,' 1866, p. 377, 

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



