and allied Brachiopod cilia | 13 
_ of these features, 
In the dorsal valve there is a strong hinge plate or process, 
by a median septum which reaches from one-third to one-half 
the length of the valve, and on each side, marked by deep den- 
tal fossets, while the anterior _—— are produced into the erura 
which support the internal sp 
Spires arranged as in Aayee and WMerista, being a double 
cone with the apices directed outwards. From the lower lateral 
margins of the cardinal process or hinge plate, there is a callosity 
extending beneath and anterior to the dental fossets, and joining 
— the thickened margin of the valve, as in the’ other allied 
fa the cast of the dorsal valve we have the mark of the me- 
dian septum, with an elongate, lanceolate muscular impression, 
reaching nearly to the middle of the valve. The imprint of the 
Bienguler process, and the cavities made by the crura are often 
= 
The species of this genus may be readily distinguished from 
Merista, by the absence of the shoe-lifter process, which, in nu- 
- merous specimens compared, constitutes the principal difference 
between the two genera 
‘The illustrations on the receding page will serve to show 
more clearly the characteristics of se us. 
In the dorsal valve of I. Barris ab iaive a hinge plate, with 
a median septum reaching more shan one third the length of 
the shell, and the same characters exist in Mf. Haskins. In M. 
e cas genus. 
f ieee New of New York, vol. iii, plate 39 
* In reclaiming these species of Meristella, I am not impugning the validity 
the genus Charionell i 
“dorsal valve of Charionella as represented o 274, No. 38 of the Canadian 
itil, et 9 ery distinct from an 
1, which is not only clearly unlike Meri 
of Spiriferide before described. 
