TAB. VI. 
Fig. 
1. Dentalina Permiana (x 26). 
se 
12. 
13. 
A: 
15. 
16. 
We 
18. 
19. 
20. 
21. 
. Dentalina Kingii (x 30). 
. Dentalina Kingti (x 30). A longitudinal section, rather on one side of the 
median line. 
. Dentalina () (x 32). 
. Textularia Triticum (X 24). Shell seen obliquely. 
. Textularia cuneiformis (x 34). Shell seen in profile, edge or back view of one 
row of cells being shown. 
. Serpula (?) pusilla (<x 10). Nearly perfect. 
ue pak Part of the outer coil. 
93 
— — Perfect. 
39 
. Spirorbis helix, Avmg. Gutta-percha cast of the upper or free side of an impression 
on a Productus horridus ; thrice the natural size. Hum- 
bleton Hill. 
—— _- Natural cast of the attached side on the same shell as the 
last. 
Spirorbis Permianus, A7zg. . Upper or free side, thrice the natural size. Byers’s 
Quarry. 
ees a Attached side, thrice the natural size. Byers’s Quarry. 
Vermilia obscura, Avvg. Thrice the natural size. Attached to one of the cup-plates 
of Cyathocrinus ramosus. Tunstall Hill. 
Cyathocrinus ramosus, Schlotheim. Side view of the cup, twice the natural size. 
Tunstall Hill. 
— —- Basal view of ditto, showing pelvic and costal plates. 
— — Articulating surface of scapular plates, enlarged. 
-— = Diagram showing the plates separated: a, canal; 4, pelvic 
plates ; ¢, costal plates ; d, modified costal plate ; e, sca- 
pular plates ; 7, supplementary scapular plate; 7, super- 
added scapular plate. 
—_ = Beaded internodes of the column, twice the natural size. 
Tunstall Hill. 
aa se Plane internodes enlarged, showing attachment-scar of a 
branch. Humbleton Hill. 
ae os Articulating surface of an internode (twice the natural size), 
showing the pentagonal canal, &c. 
