: DEVONIAN FAUNAS. 
oo 
Cs 
AMBOCOELIA UMBONATA (Con.). 
1867. Amboceha wmbonata Hall, Pal. N. Y., vol. LV., p. 259, pl. 44, 
figs. 7-18. 
Description.—Shell small, plano-convex, length and width nearly 
equal or a little wider than long; hinge-line a little shorter than the 
width of the shell; cardinal extremities rounded. Pedicle valve gib- 
bous; the umbo elevated; the beak rather large and incurved; mesial 
sinus narrow, distinct from the beak to the front of the shell; cardinal 
area high, concave. Brachial valve depressed-convex or nearly flat, 
sometimes concave towards the front and lateral margins. Surface of 
both valves smooth or with a few concentric lines of growth near the 
margin. 
The dimensions of the best specimen observed from New Jersey are: 
length, 3.5 mm.; width, 4.5 mm. 
Remarks.—The only specimens of this species which have been ob- 
served in the New Jersey collections are from the fossil locality in the 
Monroe shales near the shore of Greenwood lake. They are not at 
all common, and are found only in the condition of internal casts, 
which are usually distorted and poorly preserved. 
ANOPLOTHECA ACUTIPLICATA (Con.).? 
Plate LIII., Fig. 3. 
See, also, pp. 370 and 377. 
The internal casts of what seems to be a species of Anoplotheca are 
among the commonest fossils found in the Monroe shales at the Green- 
wood lake locality. The specimens in this condition do not seem to 
liffer materially from those found in the Newfoundland grit which 
have been identified as A. acutiplicata. All of the specimens are in 
an unsatisfactory condition for study, but this identification seems to 
be the correct one. 
