114 
ICHTHY0D0EUL1TES. 
Lisp acanthus retrogradus, Davis. 
1883. Lispacanthus retrogradus , J. W. Davis^ tom. cit. p. 359, pi. xlviii. 
fi 0 " 5 
Type. British Museum. 
The type species. 
Form, Log. Lower Carboniferous Limestone : Armagh. 
P. 2544. 'Type specimen. The smoothness of the exserted portion 
may be due to abrasion, but at present there is no decided 
evidence of this. Enniskillen Coll. 
The following spine is also doubtfully placed here :— 
Lispacanthus gracilis , J. W. Davis, tom. cit. p. 359, pi. xlviii. 
fig. 6.—Carboniferous Limestone ; Kendal Fells, West¬ 
moreland. [Mus. Greol. Soc. London.] 
Genus LEPRACANTHUS, Owen. 
[Greol. Mag. vol. vi. 1869, p. 481.] 
Dorsal fin-spines of small size, slender, much laterally compressed, 
and gently arched; sides of exserted portion ornamented with lon¬ 
gitudinal series of large ganoine-coated tubercles, almost pear-shaped 
or comma-shaped and connected in the distal portion of the spine, 
but becoming obliquely oval and well separated proximally ; anterior 
margin keeled ; posterior face with few large slender denticles. 
Lepracantlras colei, Owen. 
[Plate I. fig. 1.] 
1843. Lepracanthus colei , Sir P. Egerton, in Agassiz, Poiss. Foss. vol. iii. 
p. 177 (name only). 
1869. Lepracanthus colei , It. Owen, Greol. Mag. vol. vi. p. 481, woodc. 
1876. Lepracanthus colei , J. W. Davis, Quart. Jo urn. Geol. Soc. vol. 
xsxii. p. 335. 
Type. British Museum. 
The type species. 
Form. Sf Loo. Coal-Measures : FT. Wales, Yorkshire, and Lanark¬ 
shire. 
P. 2861, P. 615. Type specimen and counterpart, shown somewhat 
enlarged andrestored in the accompanying woodcut (fig. 9) : 
Buabon, Denbighshire. The posterior denticles are well 
preserved. Enniskillen 6f Egerton Colls. 
