GEOLOGICAL DISTRIBUTION OF SPECIES AND VARIETIES OF 

 BRITISH TRIGONI^, WITH REFERENCES TO THE FIGURES AND 

 DESCRIPTIONS IN THE PRESENT MONOGRAPH. 



TRIASSIC SYSTEM. 

 Rhcetic Formation : allied geuus, Myophoria. 



Myophoria postera, Querist. PI. xli, figs. 6, Ga, 7, 7 a, 8, 8 a, 9, 9 a 



PAGE 



212 



JURASSIC SYSTEM. 

 Lower Lias. 

 CosTATiE ? Trigonia modesta, Ta/e. PI. xli, figs. 13,13a , 



Middle Lias. 

 GlabbjE Trigonia Lingonensis, Dum. PI. xxii, figs. 1, 1 n, 2, 3, 4 



Upper Lias. 



ScAPiioiDEyE T. pulchella, Ag. PI. xxxviii, figs. 10, II, 12, 12 a 



UNDULATiE T. literata. Young ^ Bird. PI. xiv, figs. 1, 1 «, 2, 3, 4 . 



212 



98 



185 

 64 



MIDFORD OR SUPRA-LIASSIC SANDS. 



UndulaTjE T. Leckenbyi, Lye. PI. xvi, figs. 1,2 



6 . 

 G . 

 CosTAT/E T. denticulata, Ag. PI. xxix, figs. 1, 2, 3, 4 



f T, formosa. Lye. Pi. v, figs. 4, 5, 

 Clavellat* I ^ Ramsayi, Wright. PI. vi, fig. ( 



71 



35 



49 



152 



ScAPHOIDEi^E. 



Inferior Oolite. 



rT. Bftthonica, Lye. PI. i, fig. 3 

 I T. duplicata, Sow. PI. i, figs. 8, 9, 10 

 -^ T. gemmata, Lye. PI. i, fig. 7 



— {var. bifera). Lye. Footnote 



\^T. recticosta, Lye. PI. i, figs. 4, 5, 6 



17 



14 



15 



. 239 



IG, 198 



