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THE FISHES OF LEICESTERSHIRE AND RUTLAND. 
Sub- ORDER TECT OSP ON D Y LI. 
Family P E T AL 0 D 0 N T I D 
Gteno'ptychius apicalis, Agassiz. 
The Museum of Practical G-eology, Jermyn St., London, possesses a tooth 
from the Coal Measures, Ashby-de-la-Zouch. Also reported from the same locality 
by W. Molyneux (Appendix op. cit.). 
Petalodus, Owen (sp. ind.). 
Recorded twice from the same locality as the preceding species (Appendix 
op. cit.*), but Mr. A. S. Woodward writes me : — “ The so-called ‘ Petalodus ’ of the 
Coal Measures may, in many cases, be a side-tooth of Janassa Glimaxodus’).” 
Order ICHTHYOTOML 
Family PLE U RAC AN THIDiE. 
Diplodus gibbosus, Agassiz. 
Teeth have been recorded | from the Ashby Coal-Field (Appendix op. cit.), 
and Mr. A. S. Woodward writes me: — Pieur acanthus, Agassiz, is the correct 
name of the genus to which the spines are attributed, and Diplodus is 
certainly the tooth of this : but, as we do not know to which species of 
Pleuracanthus the Diplodus gibbosus pertains, the latter name must be 
provisionally kept.” 
Sub-class MA RSIPOBRA NCHII. 
Family P E T B 0 M Y Z 0 N T I D^. 
LAINIPERN. Petromyzon fluviatilis, Linnaeus. 
“ River Lamprey.” 
Sparingly found in some of the streams of the county. 
FRINGE-LIPPED LAMPERN. Petromyzon branchialis, Linnaeus. 
“ Small Lampern,” “ Pride.” 
Sparingly found in some of the streams of the county. 
* I find also recorded in this book : — “ Small tooth with three cutting edges (new). Onchus 
sp. Fin defence, plain, slightly curved, 2^ inches in length. Curiously-ornamented bones, etc.” 
Of these, which cannot be determined with certainty, it is suificient to say that Ort,chus proper 
does not occur in the Carboniferous, but that the “ fin-defence ” is probably a fin-spine of 
A canthodes . 
t As also under its synonym of minutus. 
