PLATE I. 
Fig, . Pa S 0 
1. 1 a. Lepracanthus colei , Owen ; dorsal fin-spine, lateral 
aspect, and portion of ornament enlarged four times.— 
L. Coal-Measures; Lowmpor. [P. 2233.] 115 
2. Aconclylacanthus colei, Davis ;* transverse section of dorsal 
fin-spine.—L. Carboniferous Limestone ; Armagh. 
[39167.] 108 
3. Oracanthus (?) milleri , Ag.; spine.—-Ibid. [P. 3134.] 137 
• + 
4. Cynopodius crenulatus , Traq.; spine. — Calciferous Sand¬ 
stone ; Pitcorthy, Fife. [42085.] 154 
5. 6. Acanthodes pusillus , Ag. — L. Old Led Sandstone ; 
Tynet Burn. [35786, P. 1329.] 12 
7. Axanthodes mitchelli, Eg.—L. Old Bed Sandstone; Forfar. 
[38594.] . 13 
8. Ischnacanthus gracilis (Eg.).—-Ibid. [P. 132.] 22 
9. Ganodus oweni, Ag.; left palatine tooth, oral aspect.— 
Stonesfield Slate. [P. 3100 b.] 56 
10. Ganodus dentcitus, Eg. ; left mandibular tooth, inner 
aspect, twice nat. size.—Ibid. [P. 614.] 57 
11 a, b. Ganodus rugidosus , Eg.; right mandibular tooth, 
inner and outer aspects.—Ibid. [P. 5152.] 58 
12. Ganodus curviclens , Eg.; right mandibular tooth, outer 
aspect.—Ibid. [P. 599.] 58 
13. Ganodus (?) bucJclandi , Eg.; right palatine tooth, oral 
aspect.—Ibid. [P. 3107.] 58 
14. Ischyodus colei (Ag.) ; left palatine tooth, oral aspect,— 
Ibid, [P- 480.] . 60 
15 a—c . Chimcera pliocenica, sp. nov. ; right palatine tooth, 
oral, superior, and inner aspects.—Pliocene; Tuscany. 
[47032.] 91 
