BRACHIOPODA. 
261 
Genus NEWBERRIA, Hall. 1891.* 
PLATE LXXVIII. 
1867. Remaelccna, Meek. Trans. Chicago Acad. Sci., vol. i, pt. i, p. 108, pi. viii, fig. 8; pi. xiv, fig. 4. 
1867. Rensselaerla? Halt,. Palseontology of New York, vol. iv, p. 385, id. IviiiA, figs. 9-20. 
1883. RevsseJceria, Claa'polb. Proc. Ainei-ican Philosophical Society, p. 235. 
1891. Nmherria, (Hall) Whiteaves. Contrihntions to Canadian Palseontology, vol. i, pt. 3, p. 237, 
pi. XXX, figs. 3, 4, 4 a. 
1891. Newherrla, Hall. Tenth Ann. Kept. N. Y. State Geologist, pp. 91-99, pis. v, vi. 
Diagnosis. Shell elongate-ovoid, having the general contour and external 
aspect of Renssel^ria and Amphigenia, but without the strongly radiate-striate 
surface prevailing in the former genus, and less strongly developed in the lat¬ 
ter. The greatest convexity of the valves is in the umbonal region, or above 
the middle of their length, and in some forms the surface is distinctly flattened 
over the lateral slopes, leaving the median portion of the valves very promi¬ 
nent and sometimes subangular. The cardinal and lateral margins are regular, 
even and not inflected. 
The pedicle-valve has the rostrum produced and incurved, the apex slightly 
truncated by the subcircular foramen; deltidial plates small and obscure. The 
teeth are comparatively small, projecting forward and gently upward, free at 
their extremities, and supported by narrow dental plates which join the bottom 
of the valve above the middle of its length and are continued forward as 
slender, widely divergent ridges upon the inner surface, gradually merging 
into the shell. 
In the bottom of the rostral and umbonal cavity is a broad, usually ill- 
defined muscular area, from which radiates a series of vascular ridges and 
depressions extending into the marginal region of the valve. The diductor 
scars are situated posteriorly and deeply impressed; between and in front of 
them is a narrow, elongate adductor scar which is rarely divided medially and 
often extends forward to, or beyond the center of the'valve. On each side of 
the muscular impression is a thickened area, very narrow at its origin in the 
*On account of similarity to RENSSELiEiuA in extei-ior form and external shell-markings, the discussion of 
Newbeeria is introduced here, though we ai-e still in ignorance of the sti-ucture of its brachial appaiatua. 
Furthei’ consideration of the Renssel.®ria brachidiurn and its vai-iations is given with the observations on 
Centronella and its allies, immediately following. 
