﻿114 H'llTliYODOKULlTES. 



Lisp acanthus retrogradus, Davis. 



18S3. Lispaeanihus retrogradus, J. W. Davis, torn. cit. p. 359, pi. xlviii. 

 fig. 6. 



Type. British Museum. 



The type species. 



Form. $ Loc. 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. Ennishillen Coll. 



The following spine is also doubtfully placed here : — 



Lispaeanihus gracilis, J. W. Davis, torn. cit. p. 359, pi. xlviii. 

 fig. 6. — Carboniferous Limestone ; Kendal Pells, West- 

 moreland. [Mus. Geol. Soc. London.] 



Genus LEPRACANTHUS, Owen. 

 [Geol. 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. 



Lepracanthus 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, R. Owen, Geol. Mag. vol. vi. p. 481, woodc. 

 1876. Lepracanthus colei, J. W. Davis, Quart. Journ. Geol. Soc. vol. 



xxxii. p. 335. 



Type. British Museum. 

 The type species. 



Form. 6f Loc. Coal-Measures : N. Wales, Yorkshire, and Lanark- 

 shire. 



P. 2861, P. 615. Type specimen and counterpart., shown somewhat 

 enlarged and restored in the accompanying woodcut (fig. 9) : 

 Euabon, Denbighshire. The posterior denticles are well 

 preserved. Enniskillen <$f Egerton Colls. 



