80 



CRETACEOUS LAMELLIBRANCHIA. 



Trigonia uj'warensis, Lycett, 1875. 



1875. Trigonia upwarensis, Lycett, -p. 143, pi. xxiii, figs. 8, 9 ; pi. xxxix, fig. 4. 

 1883. — — W. Keeping. Foss., etc., Neoc. Upware and Brick- 



hill, p. 113. 



Remarhs. — This species is allied to 7'. Archinciava, d'Orbigny, but tlie costfie 

 are more numerous and have greater curvature near the anterior l)order. The 

 costella3 on the area appear to be generally more numerous and more nearly 

 perpendicular to the carina. The outline of the larger specimens appears to be 

 more rounded than in T. Archincvijia. 



Ti/pes. — In the Museum of Practical Geology. The specimen figured on Lycett's 

 pi. xxxix is in the collection of Mr. J. F. Walker. 



Distribution. — Lower Greensand of Upware. 



Trigonia Archiaciana, iVOrhigny, 1844. 



Addit ioiia I Synov yw y. 



1866. Trigonia Archiaciana, F. J. Pictet and G. Campiclie. Foss. Terr. Cret. 



Ste. Croix (Mater. Pal. Suisse, ser. 4), 



p. 380. 

 1875. — — Lycett, pp. 140, 202 (partim), not the figures. 



Remarks. — It seems doubtful whether this species occurs in England; I have 

 seen two specimens from the Pe?'/;(y-bed of Atherfield and Sandown, which may 

 perhaps belong to it ; l)ut they are not sufficiently perfect for exact determination. 

 The surface of the specimen from the Gault of Okeford Fitzpaine, figured by Newton/ 

 has perished, so that I am unable to give any opinion as to its affinities. 



Trigonia spinosa, Parkinson, 1811. 



Additional Synonymy. 



1875. Trigonia spinosa, Lycett, p. 136, pi. xxiii, fig. 10; pi. xxiv, figs. 8, 9; 



pi. xxviii, figs. 1, 2. 

 ? 1881. — — /. Kiesniv. Schrift. d. nat. Gesellsch. in Danzig, 



vol. V, p. 413. 



I 'Proc. Dorset Nat. Hist, and Antiq. Field Club.,' vol. xviii (1897), p. 96, pi. iii, fig. 16. 



