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forms are members of the family Ceramoporidae. The twelve trepostoma- 
tous genera are represented by twenty-four species. The Batostoma, Hallo- 
pora and Nicholsonella are most abundant and appear in every locality from 
which collections have been made. Seven genera and twelve species belong 
to the order Cryptostomata. Graptodictya, Rhinidictya and Escharopora 
are the most abundant in number of specimens. 
Ridley fauna. Bryozoa in the Ridley limestone are not usually conspicu- 
ous. Orbignyella occurs in many of the outcrops of the formation, but 
good collecting localities for the other forms are rare. 
Lebanon fauna. In many localities bryozoans are abundant. The Cryp- 
tostomata are most abundant in genera and species, but the large Treposto- 
matous forms are most conspicuous. 
Arthoclema striatum Ulrich. Numerous species that are identical with 
the Black River forms are found in the Lebanon formation. 
Chasmatopora sublara (Ulrich). This species is a long ranged simple 
cryptostomatous bryozoan. It is very abundant in the Pierce beds and is 
common in all other divisions of the Stones River. 
Escharopora briareus (Ulrich), FE. libana (Safford), EB. ramosa (Ulrich), 
are common and characteristic of the Lebanon formation. The forms in 
the Pierce have been referred to H. angularis Ulrich, and H. confluens, which 
are common in the Black River of Minnesota. 
Helopora spiniformis (Ulrich) is common in the Pierce, Ridley, and 
Lebanon limestones. m 
Numerous examples of Pachydictya resembling in all important features 
the P. foliata of the Black River of Minnesota, are compared with that 
species. It is abundant and grows slightly larger than the Minnesota forms. 
Corynotrypa delicatulata (James) is reprsented by numerous and well 
preseryed specimens in the Pierce and Lebanon limestone. Corytrypa ten- 
nesseensis Bassler is not so abundant as C. deliculata but many small frag- 
ments of zoaria occur in the Pierce outcrop at Ward’s Mill, Rutherford 
County. 
Mitoclema cinctosum Ulrich occurs in many places in the Ridley lime- 
stone and is abundant at Almaville, Tennessee. 
Batostoma libana (Safford) was described by Safford in 1869 and is re- 
described in this paper as a common and characteristic fossil of the Lebanon 
limestone. Batostoma suberasum, new species, has not been described from 
the Chazy of New York but specimens in the collections made by Dr, E. R. 
Cumings are similar to the Tennessee species. 
Dianulites cf. petropolitanus is very abundant in the Ridley limestone and 
is usually poorly preserved. It is closely related to D. pcetropolitanus Dy- 
bowoski. 
Hemiphragma irrasum (Ulrich) is abundant in the Pierce and Ridley 
limestone. It shows slight variations from the Black River species of Min- 
nesota but it is not thought advisable to suggest a new name at this 
time. 
Nicholsonella pulchra Ulrich and N. frondifera new species, are the very 
abundant and most conspicuous trepostomatous bryozoa of the Stones River 
