SSeS ORS Wo ee me ge Nea ry, 
J. Hall on ipa Centroneila, Meristella, etc. 1 
Arr. Fae Observations upon some of the Brachiopods, with repent 
to the genera Cryptonella, Centronella, Meristella, and allied form 
by JAmes Hatt. Abstract of a paper read before the ‘Albahy 
Institute, February 3d, 1863.’ (Communicated by the author.) 
(Concluded from vol. xxxv, page 406.) 
In the Thirteenth Report on the State Cabinet (p. 74, 1860), I a 
posed the Genus Meristella, to embrace certain species before in- 
eluded under the Genus Merisia, and which were shown. not to 
ossess the peculiar shoe-lifter process, or transverse septum, char- 
acteristic of the latter genus. I remarked as follows: “ Restrict-. 
ing, therefore, the signification of the genus Merista to such forms 
as were originally included by Prof. Suess under that name, it 
becomes necessary to designate those species of similar form, but 
without the Beettins appendage of the ventral valve, by another 
generic term; and [ would therefore suggest the name of Meris- 
age proposed by me last year.” 
After describing the genus, I cited as illustrations several spe- 
cies from the Lower Helderberg group; and gave figures of the 
exterior of Meristella princeps and M. nasuta, the latter species 
from the Upper Helderberg group. 
In the same Report I described three other species of the 
genus, viz: Meristella Haskinsi, M. Barrist and M. Doris, but 
ba giving illustrations of these. 
ce, on the one side, this genus has been claimed to be 
ccieivaloar to Athyris , and, on the other, the same author has 
dai: sore of its species under a later created genus Charionella, 
seems necessary to repeat some ¢ the characters of the genus 
in this connexion. 
nus MERISTELLA Hall, 1860. —The genus ingore terebra- 
tuloid or Athyroid forms which are ovoid, more or less elor 
sometimes elliptical in outline, and not et 8 2g transverse 
of oes Pert unequally convex, with or without a 
an fold an us, and this feature usually confined to the 
ver half of the ‘shell. Ventral beak more or less closel 
incurved (when se a incurved apparently im dei stk termi- 
nated by an aperture, the lower be formed 
by the umbo of the dorsal valve, or by a lett Area none,’ 
' From the Transactions of the Albany Institute, Mipet wove verbal corrections 
“ aaa om dhe State Cabinet, 1059, page, 18; ia ref 
naviformis of vol. ii, Pal. N. Y. to Merist T said?» This pie cs 
others of the Clinton and wie groupa, differ somewhat from true ng and 
should ala differences prove of generic importance, I propose for them the 
es with the ventral valve closely incurved are ly imperfo- 
map vores taba is visible above the umbo of the dorsal valve. In the se 
att salves of these species, [have not seen any deltidium ; an open 
space exists above the points of the dental lamell, and this communicates with the 
open cavity of the valve. 
