198 
AUG. F. FOERSTE 
6. Mcewanella raymondi sp. nov. 
Plate XXIII, fig. 1 
Only a single brachial valve known, 26 mm. wide at the hinge- 
line, 20 mm. long, and with a convexity of 9 mm. Valve strongly 
plicated, the crests of the two median plications being only 3 mm. 
apart and elevated into a median fold which rises 3 mm. above 
the bordering depressions. The anterior margin of the shell 
curves backward 5 mm. along this fold, thus indicating the pres- 
ence of an equally conspicuous sinus on the pedicel valve. On 
each side of the median fold of the brachial valve there are five 
lateral plications, of which the first two are conspicuous, the 
third is of intermediate size, the fourth and fifth are low, and a 
distance of about 1.5 mm. intervenes between the fifth plication 
and the hinge-area. The elevation of the first and second pli- 
cations is about one millimeter ,, and their crests are rather ab- 
ruptly rounded. The entire surface is radiately striated. At a 
distance of about 5 to 10 mm. back from the anterior margin 
these striae frequently average about 4 in a width of 2 mm., but 
nearer the anterior margin, where numerous concentric lines of 
growth indicate gerontic conditions, the number of these striae 
may increase to 6 in the same width. The finer details of surface 
structure are not well preserved. 
From the Kimmswick limestone in the Glencoe Lime and 
Cement Company quarry at Mincke, in St. Louis County, Mis- 
souri. Collected by D. C. Barton. Named in honor of Prof. 
Percy E. Raymond of Harvard University, to whom I am in- 
debted for the loan of this specimen. 
7. Parastrophia hemiplicata var. 
Plate XXI, fig. Jj.; plate XXII , fig. 4 
Two valves found in the Kimmswick limestone at locality 4 
on Sanders branch, in Ralls County, are referred to Parastrophia 
because they present a median septum extending forward as far 
as midlength of the valve, separating posteriorly into two slowly 
diverging lamellae such as those forming the narrow spondylium 
s 
