PLATE XII. 
Pig- Pag® 
1. Rhizodus hibberti (Ag. & Hibb.); left mandibular ramus, 
external aspect, one-third nat. size.—Lower Carbon¬ 
iferous Limestone; Gilmerton. ag. Angular, d. Dent¬ 
ary. inf.d. Infradentaries. [P. 3317.] 344 
2. Ditto; lower laniary tooth, lateral aspect.—Possil Black- 
band (Middle Carboniferous Limestone) ; Airdrie. 
[P. 4800.] 344 
3. Ditto ; right clavicle, visceral aspect, one-third nat. size. 
—Gilmerton. [21222 f.] 345 
4. Ditto ; right infraclavicle, visceral aspect, one-third nat. 
size.—Ibid. [24841.] 345 
5. Rhizodus ornatus , Traq.; operculum, external aspect.— 
Ibid. [P. 3321.] 347 
6. Ditto ; right clavicle, imperfect superiorly, external aspect. 
—Ibid. [P. 3345.] 347 
7. Ditto ; right infraclavicle, visceral aspect.—Ibid. 
[P. 3321.] 347 
8. Ditto ; scales, external aspect.—Ibid. [P. 334 j.] 347 
9. Ditto ; scale, inner aspect.—Ibid. [36914.] 348 
