CYTHEREIS AURICULATA. 19 



§ III. Subquadrate forms^ with marginal ridges and central swelling; often 



reticulate and spinose. 



1. Cythbebis triplioata (Bomer). Plate I, figs. 56 — 61. 



Ctthebina triplicata, Burner. Verstein. Kreidegeb., 1840, p. 104, pi. xvi, fig. 16. 

 Cytheee aueiculata, var. semimaeginata, Cornuel. Mem. Soc. geol. France, ser. 



2, vol. i, pt. 1, 1846, p. 200, 

 pi. viii, figs. 17, 18. 

 Cytheeeis teiplicata, Jones. Monogr. Entom. Cret., 1849, p. 18, pi. iii, figs. 



Q a—h. 



Fig. 56. Length '88 ; height '5 mm. 



Fig. 57. „ -83; „ -44,, 



Fig. 59. ,, '9 ; thickness '47 ram. 



Fig. 60. ,, I'O ; height "55 mm. 



Fig. 61. Height "58 ; thickness "5 mm. 

 We may note that very probably Cyjmdina Foersteriana, Bosquet, ' Mem. Soc. 

 R. Sci. Liege,' vol. iv, 1847, p. 364, pi. 2, figs. 4a — d, though narrow in front and 

 smoother, is essentially the same as G. triplicata, Romer. The bad drawing in the 

 * Verst. nordd. Kreid.' misled M. Bosquet, but our fig. 57 might seem at first sight 

 to have only one furrow, as in Romer's figure. Bosquet's Gythere pulchella, 

 var. B, also (' Mem. Oomm. geol. Neerl.,' vol. i, p. 86, pi. ix, figs. 2 a — d) belongs 

 to the same group. 



Localities. — Chalk, Colchester and South-east England ; Ghalk-roch, Dun- 

 stable ; Ghalk-marl, Didcot ; Detritus, Charing ; Gault, Folkestone, Leacon Hill, 

 and Godstone; Greensand, Cambridge. 



Foreign. — GJialk, Maastricht ; Hils-clay, North Germany ; Neocomian, Haute- 

 Marne, France. 



2. Cythbreis AURICULATA [Gomuel). PI. I, figs. 53 — 55. 



Cytheee aueiculata, Cornuel (partim). Mem. Soc. geol. France, ser. 2, vol. i, 



pt. 1, p. 200, pi. viii, figs. 14—16. 



Fig, 53. Length 1*08 ; height '52 mm. 

 Fig. 54. „ -96; „ -48 „ 



Fig. 55. „ -8; „ -48 „ 



"^ As stated in the ' Supplemental Monograph of the Tertiary Entomostraca of England ' (p. 6), we 

 find it useful to retain the quasi-genevic term Cythereis for these forms. 



