CESTRACI0NTID3!. 
287 
P.3173. A smaller group of more imperfect scattered teeth in matrix. 
Enniskillen Coll. 
P. 418. Numerous scattered teeth, naturally associated in matrix. 
Presented by F. Seymour Haden , Esq., 1882. 
P. 2144. Group of about ten imperfect teeth. Egerton Coll. 
P. 5872. Six naturally-associated broad teeth ; Weston, near Bath. 
11258. Four detached teeth; Weston. Mantell Coll. 
» 
P. 2141. Six detached teeth; Weston. Egerton Coll. 
P. 2744, P. 2746-7. Five detached teeth ; Weston. 
Enniskillen Coll. 
P. 2748. Three associated teeth ; Keynsham, near Bath. 
Enniskillen Coll. 
11279, 20161, 25850, 32753, 35727, 41280, 43398. Twelve 
detached teeth. Purchased. 
P. 424. Five teeth. Purchased, 1882. 
P. 2143. Two detached broad teeth, one showing a tendency towards 
a transverse division into two. Egerton Coll. 
The dorsal fin-spines of Acrodus nobilis are large and curved ; the 
lateral ribs are rounded and widely spaced ; and the posterior den¬ 
ticles are of enormous size, placed upon a longitudinal elevation of 
the hinder face. The spines are associated with the teeth in 
No. P. 3154; and they occur in the Lias of Weston, near Bath, 
where the only known Acrodus- teeth are referable to this species. 
The following examples occur in the Collection :— 
P. 3158. Naturally associated anterior and posterior dorsal spines, 
much crushed, and the latter incomplete proximally. The 
exserted portion of the first measures about 0*41 in length, 
and the base 0-14. Enniskillen Coll. 
19814. Imperfect large spine. Purchased, 1845. 
20008. Imperfect large stout spine. Johnson Coll. 
30868. Imperfect pyritized large spine, the exserted portion mea¬ 
suring 0 25 in length. Purchased, 1856. 
38126. Typical spine, the exserted portion measuring 0*4 in length, 
and the base 0‘14. Purchased, 1864. 
