COCHI.IODONIID.B. 
175 
P. 1414. Three fragmentary dental plates, one showing a transverse 
suture, another with broad lateral wings, and the third of 
the form figured by J. W. Davis, loe. cit. figs. 0, 7 ; Car- 
luke. Kgerton Coll. 
P. 2281. Fourteen specimens ; Carluke. Emmhillen Coll. 
P. 2480, P. 2482. Twelve dental plates, mostly abraded, of all the 
different forms ; Carluke. An unworn fragment shows a 
median longitudinal wrinkle, with short branches, and 
small wrinkles directed towards the median carina upon 
the lateral prolongations. Ennishillen Coll. 
Pleuroplax attheyi (\V. J. Barkas). 
1843. Pceeilodus angttstus, L. Agassiz, Poiss. Foss. vol. iii. p. 174 (name 
only). 
1874. Pwcilodm attheyi, W. .1. Barkas, Monthly Rev. Dental Surgery, 
vol. iii. p. 57, figs. xl.-.\liv. 
Type. Detached dental plate. 
Axial Carina of the dental crown low, but sharply angulated, 
divided by deep transverse sulci, corresponding to the divisions 
between the incompletely coalesced components. Dental plates 
approaching an elongated oval in form, usually broader at one 
extremity than the other, witliout prominent median lateral expan- 
sions. 
Many of the dental plates from the Scotch Coalfield are twice as 
large as the t)'pical examples from Northumberland. 
Form. Loc. Coal Measures : Northumberland and Lanarkshire. 
21423. Eight dental plates, some abraded, and the largest 0'012 in 
length; Carluke, Lanarkshire. Two examples are shown, 
of the natural size, in PI. VI. figs. 10, 11. 
Purchased, 1847. 
P. 2466. Four large examples, one unabraded; Carluke. 
Enniskillen Coll. 
P. 2282. Two specimens ; Carluke. Enniskillen Coll. 
Pleuroplax woodi, Davis. 
1874. Pleurodiis, .sp., W. J. Barkas, Monthly Rev. Dental Surgery, 
vol. iii. p. 9. 
1883. P/eurodus woodi, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. p. 438, pi. lix, figs. 12-15. 
