On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 409 
Lophodus levis, Davis. 
(PE LI; figs: 26, 27.) 
Teeth, median or small, varying from ‘6 in transverse diameter and ‘2 inch antero- 
posterior diameter to one-third that size. Crown, variable in form, raised to form 
a sub-median cone; a ridge descends from the central cone on each side situated 
on the posterior surface of the middle line; extremities subquadrate or very 
obtusely rounded; crown surface enamelledand punctate ; anterior and posterior basal 
margins of crown, prominent, forming a sinuous ridge, much elevated in centre. 
Base short, less extensive than the crown, open porous structure. 
This species is much wider from back to front than L. serratus, and the transverse 
ridge is smooth and without serrations. An example is figured showing four teeth 
in their natural position, which appear to belong to this species though they are not 
quite so broad in proportion to the width as the larger specimen. 
Formation and locality : Mountain Limestone, Richmond. 
Ex coll. Reed collection, York Museum. William Horne, Esq., Wensleydale. 
Lophodus sinuosus, Davis. 
(PAL, Ibll, ii, BS},)) 
Teeth, medium size ; crown, nearly an inch across, and ‘25 of an inch from front 
to back, peculiar sigmoidal form, right lateral extremity sub-quadrate, depressed, 
surface raised to form a single cone, about one-third the distance from the 
extremity. Cone with broad, obtuse antero-posterior ridge ; left prolongation of 
surface level, anterior and posterior margins slightly convergent for a distance 
equal to the leneth of the right extremity, remaining portion extends at an angle 
of 45° backwards and is rapidly acuminate. Surface smooth and punctate, without 
lateral ridge. Base equal in depth to the height of the crown with the usual 
characters. 
This peculiarly shaped tooth, with others of similar but not exactly the same form, 
appears to differ from any previously described. It is quite possible that some of 
the forms now described as separate species may be discovered to be modifications 
of only one or two, but until better specimens are cbtained it will be premature to 
correlate them. 
Formation and locality ; Mountain Limestone, Richmond, York. 
Ex coll. Reed collection, York Museum, 
3T2 
