BRACHIOPODA. 
65 
Genus TOMASINA* gen. nov. 
Under the name, Lingula Criei, Mr. Davidson described, in 1881,f a linguloid 
fossil from the Armorican grit of the Departement de la Sarthe, having a cardinal 
area of such peculiar structure 
as to render its separation from 
the genus Lingula necessary. 
“ The pedicle-valve is very 
slightly convex, its posterior 
margin being notched. This 
notch is divided into two parts 
by a small triangular elevation, 
leaving on each side a well de- 
IAngula Criei. Alter Davidson. 
Figs. 25, 26. Internal cast and interior of posterior portion of 
pedicle-valve. 
Fig. 27. Internal cast of pedicle-valve. Natural size. 
fined depression or little cavity. Aside from this slight elevation, the valve 
presents a gentle longitudinal convexity, which extends a little in front of the 
center of the valve, the lateral portions of the shell remaining almost flat. The 
opposite valve appears to have been somewhat more convex than that we have 
described. 
“ This notch in the area for the passage of the pedicle is very remarkable, 
and I have never before observed it in any of the numerous species of the genus 
which I have studied. In the interior of this same valve, beneath the pedicle- 
aperture, there are two small processes with a depression between them, and 
the central muscular impressions are well defined, but I have been unable to 
find any other impressions upon the internal casts which M. Guillier 
has sent me.” 
The internal processes upon the cardinal margin are so large that they may 
have served purposes of articulation to some extent. In this respect the fossil 
shows structure similar to that seen in its associate in the same fauna, Lingula ? 
Lesueuri, Rouault. 
* Out of regard for the memory of Mr. Davidson, to whom we are indebted for our knowledge of this 
fossil, the above name is proposed. 
t Bulletin de la Societe Geologique de France, p. 372. 1881 ; Note sur les Lingules du gres armoricain 
de la Sarthe, par M. A. Guillier, avec descriptions et figures des especes, par M. Th. Davidson, pi. vii. 
