Silurian Fossils 
85 
shell; this granulated area passes behind the muscular area and 
almost reaches the beak. A profile view of the pedicel valve 
resembles fig. 4c of plate 23,vol. iii, of the New York Paleontology. 
Surface with radiating stri^, about 7 to 10 more prominent striae 
in a width of 10 mm., separated by 4 to 8 finer striae. 
Brownsport bed: glade southwest of Brownsport Furnace, three 
miles west of Vice landing, Tennessee. 
Strophonella prolongata. 
{Plate II, Figs. 2 s A, B.) 
Width, 31 mm.; length, 15 mm. Shell broadly sub-semicircular, 
considerably extended along the hinge line; brachial valve flattened 
for a distance of 10 or ii mm. anterior to the hinge line, slightly 
concave toward the middle of this surface; anterior to the flattened 
area the shell is deflected almost vertically, producing a profile 
similar to that of fig. 6c, plate 23, vol. iii. New York Paleontology. 
Pedicel valve slightly convex anterior to the beak, following the 
curvature of the brachial valve; cardinal line crenulated for a dis- 
tance of about 3 mm. on each side of the delthyrium; interior 
showing the character of the striation of the exterior surface dis- 
tinctly; muscular impressions not distinct, a faint median elevation, 
and two faint elevations defining the postero-lateral margins of 
the muscular area. Surface with radiating striae which are rather 
coarse and prominent considering the size of the shell, about 18 
to 21 in a width of 10 mm. along the anterior margin. 
Brovvnsport bed: glade southwest of Brownsport Furnace, three 
miles west of Vice landing, Tennessee. 
In the massive limestone layer near the top of the Brownsport 
bed, northeast of the stables on the Gant place, northeast of Mar- 
tins mills, a specimen is found which shows a strong median 
depression on each side of which the shell is slightly raised. It 
is represented by fig. 22 on plate ii, of this paper and evidently resem- 
bles Strophonella geniculata, fig. 6, plate 23, vol. iii. New York 
Paleontology. The striations are coarser. The specimen is poorly 
preserved. 
Strophonella dixoni, sp. nov. 
{Plate II, Fig. 21.) 
Evidently related to Strophonella prolongata, hxit smaller. Width, 
16 mm.; length, 7 mm.; brachial valve flattened and slightly con- 
