‘ 
this, 1 would #6 
inclined to refer them to the family Crassatellide, instead of to the Mytilide, 
Which Pr - McCoy associates Anodontopsis, 
298 F. B. Meek on new Silurian Crinoids and Shells. 
ways describe the same hinge exactly in the same way, I have 
concluded to refer our shell, for the present, provisionally to Ano- 
dontopsis. If a new genus, however, it may be called Orthodon- 
tis 
Prot. McCoy described the hinge of his genus as follows: “hinge 
line shorter than the shell, with a posterior long slender tooth or 
cartilage plate extending just below it (double in the right valve), 
and another similar but shorter one in front of the 
then adds that there is “ occasionally one small cardinal tooth be- 
neath the beak.” . 
lve. , 
ne is certainly simple, and the muscular impression 
erlor one being larger than the other, a? 
e 
= 
“The Specific name is given in honor of §, A. Miller Esq., of Ca 
nati, Ohio, who sent on to the Smithsonian Institute the fits 
_ * From all of the known characters of such extinct shells as 
