CESTRACIONTID.®. 
287 
P. 3173. A smaller group of more imperfect scattered teeth in matrix. 
Ennislcillen Coll. 
P. 418. 77umerous scattered teeth, naturally associated in matrix. 
Presented hy F. Seymour lladen. Esq., 1882. 
P. 2144. Group of about ten imperfect teeth. Egerlon Coll. 
P. 5872. Six naturally-associated broad teeth ; Weston, near Bath. 
11258. Four detached teeth ; Weston. Mantell Coll. 
P. 2141. Six detached teeth ; Weston. Eyerton Coll. 
P. 2744, P. 2746-7. Five detached teeth ; Weston. 
Ennislillen Coll. 
P. 2748. Three associated teeth ; Keynsham, near Bath. 
Enniskillen Coll. 
11279, 20161. 25850, 32753, 35727, 41280, 43393. 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. Eyerton Coll. 
The dorsal fin-spines of Acrodus nohilU are large and curved ; the 
lateral ribs are rounded and widely spaced ; and the posterior den- 
ticles arc 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 AVeston, near Bath, 
where the only known Acrodxts-toot\^ 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. Ennislcillen 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. 
