Lorraine Faunas of New York and Quebec 261 
coming from Chambly on the Richelieu River and as collected by 
Foord in 1881. The same slab contains Glossograptus (Ortho- 
graptus) quadrimucronatus-approximatus, Hall and Cymatonota 
recta, Ulrich. The specimen is a pedicel valve 22 mm. long and 
32 mm. wide, exposing the interior and, by exfoliation, also a cast 
of a part of the exterior. The lateral margins form angles of about 
70 degrees with the hinge-line, produced to an angle of 50 degrees 
on one side by the lateral extension of the shell along the hinge- 
line. Width of muscular area 9 mm., length 7 mm., with a broad- 
ly rotund outline. The posterior diductor scars form a nar- 
row strip only 1 mm. in width along the upper half of the lateral 
margin of the muscular area. The anterior diductor scars are 
much wider and do not show conspicuous flabellate markings. 
The adductor scars have a total width of 1.8 mm., being divided as 
usual along the median line by a prominent striation. Interior 
of shell only moderately thickened along the anterior border, the 
anterior half and the marginal parts laterally being crossed by 
radiate vascular markings which are only moderately conspicu- 
ous. The entire inner surface, aside from the muscular area, 
covered by a fine shagreen consisting of numerous minute granules 
visible under a lens. Exterior of pedicel valve evidently covered 
with finer radiating striae than those on the brachial valve, every 
fourth or sixth one tending to be slightly more conspicuous. 
Two brachial valves, evidently belonging to the Chambly spe- 
cies occur among a group labelled as coming from the Riviere 
des Hurons, however, since the individual specimens are not la- 
belled separately, there has been ample opportunity during the 
moving of collections, to mingle specimens from different lo- 
calities, so that there is no absolute certainty that the two 
brachial valves in question came from the Riviere des Hurons. 
As far as their lithological appearance is concerned, they may 
have come from the Chambly locality. The brachial valve here 
figured (plate II, Fig. 4 B) is associated in the same slab with 
Cleidophorus praevolutus, and the other specimen is associated 
with Rafinesquina mucronata. It will be noted that in the Report 
on the Geology of the Montreal Sheet, by R. W. Ells, published in 
1896 by the Geological Survey of Canada, Dr. Henry M. Ami 
lists Strophomena from the collections made at Chambly by W. E. 
Deeks in 1890, while no mention is made of the occurrence of 
Strophomena along the Riviere des Hurons. These brachial 
