DEVONIAN FAUNAS. 351 
genus. The internal characters of the shell have not been observed, 
so that no proper generic reference of the species can be made at the 
present time, it being, therefore, referred provisionally to Rhyncho- 
nella. 
CAMAROTOECHIA BARRANDEI (Hall). 
A fragment of a large Rhynchonelloid shell found in the calcareous 
Oriskany beds near the New York State line seems to represent the 
species Camarotechia barrandet. 
EATONIA PECULIARIS (Con.). 
Plate XLVII., Figs. 1-4. 
1859. Hatona peculiaris Hall, Pal. N. Y., vol. IIL, p. 244, pk 38, 
figs. 21-26, pl. 101, fig. 2; also, p. 436, pl. 101, figs. 2 a—g, 
pl. 101 A, figs. 1 a—h. 
Description.—Shell usually longer than broad, sometimes the length 
and breadth nearly equal, subovate in outline; ‘the cardinal margins 
meeting at the beak in an angle usually a little less than 90°. Pedicle 
valve depressed-convex on the umbo, inflected along the cardinal bor- 
der, flattened laterally, depressed toward the front in a deep mesial 
sinus, which is more or less produced in a lingual extension anteriorly ; 
beak rather small, closely incurved over that of the opposite valve. 
Brachial valve strongly convex, with a mesial fold conspicuous toward 
the front, but obsolete posterior to the middle. Surface of both valves 
marked by fine, radiating striw, which increase by bifurcation, and 
usually by a few inconspicuous, concentric lines of growth. On the 
lateral margins adjacent to the fold and sinus there are usually two 
or three slight denticulations, which may be produced backward upon 
the surface of the valves for a short distance as indistinct plications. 
The dimensions of a large individual are: length, 27 mm.; width, 
23 mm.; thickness, 15.5 mm. 
Remarks.—There is some doubt as to whether the specimens in the 
Oriskany fauna of New Jersey which have been identified as Hatonia 
peculiaris should not be considered as a variation of Hatonia singularis. 
These two species are closely allied, and seem to grade from one into 
