SHUMARD AND SWALLOW—NEW FOSSILS. 205 
which are gently arched forwards on either side of the dorsal 
sinus and become nearly obsolete before reaching the umbili- 
eus; these are decussated on each side of the sinus ie from 
ten to ewes: revolving thread-like lines, distinct on the dor- 
sum, but becoming indistinct towards the umbilicus; at the 
points of intersection of the transverse and revolving lines 
there is a thickening which gives to the surface a very beau- 
tiful mes psorane Fas astro dorsal gre a hesignda ror 
stron: epressed an , becoming sh erlorly, 
boule on either side 1 A a we are line, ged saat i ark cg 
the transverse sare peut § which are arched wie - 
; A4; ee t, .32; width of aperture, 
40; length of oes ceviic i * 
There is in 
e sellaotioa m2 specimen which is double the 
size of that from which the above proportions were taken. 
Geol. Pos. a cme rag —This is one of the most beautiful oe 
cies of our Western Coal Measures. ue bie obtained by Maj. 
Hawn from the valley of of Vertiges Rive 
CAPULUS PARVUS, Swallow. 
| Shel small, oblique, obsoletel carinated on the left. anterior 
and right posterior slo ees elongate, conic; a) 
3 su 
ne y ae acute, prominent ; aperture sub-re 
saa tac ie ca ah ne’ 
biel 2 ache herin ted ae | ister sinuate 
