COCaLIODONTIIl.B. 
187 
with a smalt quadrilateral flat tooth. A second example 
of the latter occurs in the Collection (So. 42230, Bimrjh 
Coll.), and it would be comprised under the accepted 
definition of Psammodus, like the so-called P. salojnensis 
(suj)rn, p. 105). The fact, however, that small quadran- 
gular flat teeth have been found bordering a dental plate 
of Psejihodus Imnssimus (supra, p. 181 ) suggests the pos- 
sibility of a similar arrangement in Saiidalodus. 
IVeaver-Jones Coll. 
P . 216. Three similar triangular dental plates, one still smaller and 
showing two sutures parallel to the inner margin ; Oretou. 
Weaver-Jones Coll. 
46909. Medium-sized dental plate ; Bristol. Purchased, 1875. 
(ii.) Incurved Bounded Variety ('! Lower Jaw). 
P. 2483. P. 2485-6. Type specimen figured by Morris & Roberts, 
tom. cit. pi. iii. fig. 1 ; also fragments of two smaller 
specimens ; Oreton. Enniskillen Coll. 
P.204-6. Three dental plates ; Oreton. Weaver-Jones Coll. 
42202- 9. Eight fragmentary dental plates ; Oreton. Baugh Coll. 
42210. Small dental plates ; Oreton. Baugh Coll. 
36000, 37986, 41192. Three imperfect dental plates ; Oreton. 
Purchased. 
Sandalodus minor, Davis. 
1834. Sandalodus minor, J. IV. Davis, Quart. Joum. Geol. Soc. vol. xl. 
p. 626, pi. xxvi. fig. 17. 
Type. Detached dental plate ; York JIuseum. 
A very small species. “ Lower ” dental plate narrow, jwinted at 
one extremit}’, broader and rounded at the other ; crown raised 
into a low rounded longitudinal ridge. 
Form. Loc. Upper Carboniferous Limestone : Yorkshire. 
P. 4894. “ Lower ” dental plate ; Yoredale Rocks, Wensleydale, 
Yorkshire. Horne Coll. 
Sandalodus angustus, Newberry & Worthen. 
1860. Sandalodus anyustus, Newberry & Worthen, I’nl. Illinois, vol. ii. 
p. 10;i, pi. X. fig. 3. 
Type. •‘Lower’’ dental plate. 
A small species, the long axis of the “ lower ” dental [)late mea- 
