TAB. VI. 
Fig. 
22. Palechinus Verneuiliana, Avg. Specimen, thrice the natural size, showing two 
rows of interambulacral plates. Humbleton Hill. 
23. — oa Thrice the natural size. Tunstall Hill. 
24(7). . . . . . . Mauricated spine of probably Palechinus Verneuihana. 
Humbleton Hill. Mr. G. Tate’s specimen. 
25. Lingula Credneri, Gezxtz. Specimen (twice the natural size) of the large valve. 
(This specimen shows the true form of the valve.) 
Marl-slate, Thickley. 
26. — — Same valve as last, twice the natural size. Marl-slate, 
Thrislington Gap. 
AT — — Small valve, twice the natural size. Marl-slate, Thrislington 
Gap. 
28. Discina speluncaria, Schlothem. Upper valve, a little enlarged, attached to a Pro- 
ductus horridus. Garmundsway. 
29. = a= Under or attached valve, twice the natural size. Thris- 
lington Gap. 
30. Epithyris elongata, Schlotheim. 
31. un a arge valve, natural size, showing variations of 
39, ce fs the species. Specimens at figs. 30, 31, 32 
39, ute we are casts from Humbleton Hill. Figs. 33, 34, 35 
34. ie cs represent testiferous specimens from Tunstall 
35, ae Os Hill. 
Soa aie — Small valve of specimen at fig. 33. 
37. an ae Small valve of a cast from Humbleton Hill. 
38. == aa Lateral view of specimen at fig. 33, &c. 
39. = = Lateral view of specimen at fig. 31. 
40. = — Lateral view of a testiferous specimen. Humbleton Hull. 
41. a = Umbonal view of a cast. Humbleton Hill. 
42. — — Frontal view of a specimen from Tunstall Hill. 
43. —= — Frontal view of specimen at fig. 33, &c. 
44. — Punctations of the shell, highly magnified, of specimen 
at fig. 42. 
45. = — View of the apophysary system, twice the natural size : 
a, loop ; 4, crural base; ¢, sockets ; d, boss or cardinal 
muscular fulcrum ; ¢, crura of the loop: Humbleton 
Hill. 
(The letter 6 should have been connected with the pointed part 
proceeding from the centre of the hinge.) 
46. Cythere Geinitziana (X 15). 
