CESTR ACIOXTIDiE. 
313 
Asteracanthus acutus, Agassiz. 
1837, Asteracanthus acutus, L. Agassiz, Pois3. Foss. vol. iii. p. 33, 
pi. viii. a. figs. 1-3. 
Type. Distal half of dorsal fin-spine ; Bedford Museum. 
Dorsal fin-spine attaining a length of about 0*27, much laterally 
compressed; anterior face keeled; posterior face slightly convex, 
.with large denticles. Ornamental tubercles relatively large, elon¬ 
gated, arranged in close series, rarely fused into ribs in known 
specimens. 
The teeth of this species are probably described under the name 
of Stropliodus tenuis , Agassiz. 
Form. Sf Log. Great Oolite : Oxfordshire. Cornbrash : Xorthamp- , 'Z^ > c r>-je2* 
tonshire. (?) Forest Marble: Dorsetshire. 
43616. Much abraded but nearly complete spine, originally measuring 
about 0*27 in length; Stonesfield Slate, Stonesfield, Oxford¬ 
shire. Purchased , 1872. 
28597. Extremity of spine, with some of the tubercles fused, pro¬ 
bably of this species; Stonesfield Slate, Eyeford. 
Purchased, 1853. 
P. 5377. Imperfect exserted portion of spine ; Great Oolite, Enslow 
Bridge, Oxfordshire. Purchased , 1877. 
47131. Incomplete crushed exserted portion of spine ; Cornbrash, 
Botolph’s Bridge, Peterborough. Sharp Coll. 
P. 285?'. An imperfect impression of a spine, doubtfully assigned 
to this species, and labelled A. stutcJihuryi, Agassiz \ by 
the Earl of Enniskillen; Forest Marble, near Bridport, 
Dorsetshire. Enniskillen Coll. 
Asteracanthus verrucosus, Egerton. 
1855. Asteracanthus verrucosus , Sir P. Egerton, Figs. & Descrips. 
Brit. Organic Remains (Mem. Geol. Surv.), dec. viii. pi. ii. 
Type. Dorsal fin-spine; Dorchester Museum. 
Dorsal fin-spine attaining a maximum length of about 0-32, 
laterally compressed, not keeled anteriorly; posterior face slightly 
raised, with two series of large denticles. Ornamental tubercles 
very numerous, closely arranged, mostly oval in form and disposed 
1 This name is given, without definition, to a fossil said to have been derived 
from the Lias of Charmouth, Dorset (Poiss. Foss. vol. iii. p. 1/7). 
