Richmond Group in Ohio and Indiana. — Xicklcs. 209 
Ohio, Tate's hill and cuts along- the traction lines to the Sold- 
iers' Home expose these strata. On Cowan's creek, in Clinton 
county, Ohio, these strata are seen overlying the Liberty beds. 
The upper part of the division is also well shown along Dutch 
creek,* several miles northwest of Wilmington, Ohio. Doubt- 
less there are many other points where these beds are exposed. 
The writer has mentioned those only from which he has col 
lected fossils. This division corresponds to the upper half of the 
Middle Richmond of "The Geology of Cincinnati." 
In these beds the Bryozoa are again exceedingly abundant 
and the predominant form of life. When compared with the 
Waynesville beds, it is seen that an almost entire change has 
come about in the Bryozoa. The cosmopolite form. Monotry- 
petta quadrata ( Rominger ) and the rather rare Contscllaria 
polystqmelhi Nicholson are rhe only described Bryozoa common 
to the two divisions. Homotrypa wortheni (James) is one of 
the commonest and most characteristic Bryozoa. Monticuli- 
pora laevis Ulrich is common at Oxford. Ohio, apparently rare 
elsewhere. Ptilodictya magniUca Miller, one of the largest of 
the ptilodictyoids, occurs at Richmond and on Short creek. 
Other characteristic Bryozoa are as yet undescribed, with the 
exception of several species of Homotrypa lately described by 
Ray S. Bassler.f 
The Rhynchotrema capax (Conrad) is still abundant in the 
lower strata of this division, but gradually diminishes in num- 
bers. As it disappears near the top, Rhynchotrema dent at um 
(Hall) takes its place. Rather strangely this form has not been 
found at Madison, Ind., according to local collectors. A brach- 
iopod characteristic of these beds and found in them only is a 
Strophomena sp. (vctusta James?). The Platystrophia acu- 
tilirata (Conrad) is also very characteristic of this division. 
Hebertella sinuata (Hall) is a common form of the Lorraine 
and Richmond, but in this division of the Richmond it is re- 
placed by the Hebertella accident alis ( Hall), a closely allied but 
distinguishable form. 
* For the opportunity of visiting these interesting localities on Dutch and 
Cowan's creeks and for much other friendly help. I am indebted to Dr. George 
M. Austin, of Wilmington, Ohio, an enthusiastic and most skillful collector 
of Richmond fossils and a philosophic student of the conditions of deposition, 
occurrence, etc., of the Richmond and overlying formations. In the midst 
of a busy professional career the Doctor finds time to investigate also the 
archaeological treasures in which Clinton county abounds. 
t Proc. U. S.Nat. Mus., xxvl, 1903. pp. 565-591, pis. xx-xxv. 
