Explanation of Plates. 467 



EXPLANATION OF THE PLATES. 



Plate I. 



Figs. 1 to 6. — Diagrammatic figures of genera to show important char- 

 acter referred to in the text — o, ocular tubercle — m, scar of 

 adduct or muscle — c, cardinal or hinge line— a, anterior cardinal 

 curve — h, posterior cardinal curve — e, anterior marginal curve — 

 d, posterior marginal curve — v, ventral margin. 



Fig. 7. — Leperditia (? ?) rugosa, n. sp. — a, right valve, side view — h, 

 same from the front — c, same from the hinge. All mag. ^, U.E.* 

 Seep. 443. 



Fig 8. — Bradorona jjerspicator, n. sp. — a, left valve, side view— h, 

 same from behind — c, same from the hinge. All mag. y — d, a 

 portion of the shell further mag. (-V-) L. E. See p. 444 . 



Fig. 9. — B. perspicator, mut. maxima, n. mut. — a, right valve, side 

 view — h, same from the front. Both mag. ^, L. E. See p. 445. 



Fig. 10. — B. perspicator, mut. major, n. mut.— a, right valve, side 

 view — h, same from. the front. Both mag. ^, U. E. See p. 446. 



Fig. 11. — B. perspicator, mut. magna, n. mut. a, right valve, side view 

 — h, same from the front. Both mag. y. L. E, See p. 446. 



Fig. 12. — Brado7-o7ia spectator, n. sp. — a, left valve, side view — b, same 

 from the front — c, same from the hinge — d, mould of the upper 

 front corner of a right valve showing ocular tubercle and 

 muscle scar. All mag. f , L. E. See p. 447 . 



Fig. 13.— S. spectator, mut. spinosa n. mut. — a, left valve, side view — • 

 h, same from the front. Both mag. f, L. E. See p. 448. 



Fig. 14. — B. spectator, mut. a'quata, n. mut. — a, left valve, side view — 

 h, same front view. Both mag. f, U. E. See p. 448. 



Fig. 15. — Bradorona ohservator, n. sp. — a, left valve — h, same from the 

 front — c, same from the hinge. All mag. -j, L. E. See p. 448. 



Fig. 16. — B. ohservator var. henepuncta, n. var. — Carapace partly 

 opened, the valves laterally foreshortened. Mag. f, L.E. See p. 

 449. 



Fig. 17. — B. ohservator, mut ligata n. mut. — Left valve, side view U.E. 

 See p. 451 . 



* U. E. and L. E. indicate Upper and Lower Etcheiiiinian respectively. 



