BRYOZOAN FAUNA OF THE ROCHESTER SHALE. 
Partial list of characteristic Rochester and Osgood bryozoa. 
Aca nthoclema a spe rum . 
Batostomella granulifera. 
* Bythopora spinulosa. 
Callopora clausa. 
Ceramopora imbricata. 
Ceramopora niagarensis. 
Chilotrypa ostiolata. 
* Diamesopora dichotoma. 
* Diploclema sparsum. 
Eridotrypa spinosa. 
* Eridotrypa solida. 
Eridotrypa striata. 
* Fenestella elegans. 
* Fistulipora crustula. 
Idiotrypa punctata. 
* Lichenalia concentrica. 
Lioclema asperum. 
Lioclema explanatum. 
Lioclema multiporum. 
Lioclema pecullare. 
Lioclema ramulosum. 
Lioclemella maccombi. 
Loculipora ambigua var. precursor. 
* Loculipora ulrichi. 
* Meekopora foliacea. 
Mesotrypa nummiformis. 
* Mitoclema sarlei. 
Monotrypa benjamini. 
Monotrypa osgoodensis. 
Monotrypa pediculata. 
Nicholsonella florida. 
i'hylloporina asperato-striata. 
* Polypora incepta. 
Rhombotrypa spinulifera. 
* Stictotrypa punctipora. 
* Tb.imniscus dichotomus. 
Trematopora tuberculosa. 
Of the above list of 37 species, those marked with an asterisk appear to be limited to the 
Rochester shale. The remaining 24 species, or about 65 per cent, are common to the 
Rochester shale and the Osgood beds. After weeding out the wide-ranged (European and 
American) species from those shown in the main list to be common to the Rochester and the 
Waldron shales, only 7 species remain to be set against the 24 in the Osgood beds, and of this 
residue 3 species, viz, Callopora elegantula, Pachydictya crassa, and Trematopora spiculata, 
occur in all three beds. The evidence in favor of the equivalence of the Osgood and Roches- 
ter is further strengthened by the fact that while practically all of the known Osgood bryozoa 
occur also in the Rochester, the Waldron, on the contrary, contains many that are unknown 
in that formation. 
The Wenlock shales of England contain a comparatively large bryozoan fauna which has 
received but little study. Of this series the Buildwas beds seem to hold a fauna most similar 
to that of the Rochester shale, and a careful comparison of the two will probably bring out 
the fact that they are closely related. 
BIBLIOGRAPHY. 
The following review contains references to the literature bearing on the bryozoa found in 
these shales and a brief outline of the work done in each case: 
Grabau, A. W. Guide to the geology and paleontology of Niagara Falls and vicinity. 
Bull. N. Y. State Museum No. 45, 1901, pp. 161-176. Gives figures and the distinguish- 
ing characters of some of the bryozoa described by Hall from the Rochester shale at 
Lockport, and states occurrence at Niagara Falls. 
Grabau, A. W. Bull. Buffalo Soc. Nat. Sci., VII, No. 1, 1901. Reprint of the above paper. 
Hall, James. Natural History of New York, Geology, IV, 1843, p. 116, figs. 2, 3. A good 
figure of the reverse of Pseudohornera diffusa is given as a "coral resembling Isis." 
Hall, James. Natural History of New York, Paleontology, II, 1852. Describes as corals 
the following new genera and species of bryozoa, all from Lockport, N. Y., a few species, 
however, being also recorded from Rochester and other localities in western New 
York: Callopora n. gen., C. elegantula n. sp., C.Jlorida n. sp., C. laminata n. sp , C. aspera 
n.sp., C. nummiformis n. sp., Trematopora n. gen., T. tuberculosa n. sp., T. coalesce/is 
n. sp. T. punctata n. sp., T. ostiolata n. sp., T. solida n. sp., T. striata n. sp., T. granulifera 
n. sp.. T. aspera n. sp., T. spinulosa n. sp., T. sparsa n. sp , Stictopora punctipora n. sp., 
Diamesopora dichotoma n. gen. et sp. (genus not characterized), Clathropora n. gen., 
C. alcicornis n. sp., C. frondosa n. sp., Retepora diffusa n. sp., R. asperato-striata n. sp., 
Ilornera ( ?) dichotoma n. sp., Fenestella elegans n. sp., F. tenuiceps n. sp., F. cribrosa n. sp. 
(from lower part of Niagara limestone), Polypora incepta n. sp., Ceramopora n. gen., C. 
imbricata n. sp., C. incrustans n. sp., C. foliacea n. sp., Rhinopora tuberculosa n. sp 
Lichenalia n. gen., L. concentrica n. sp., Sagenella n. gen., S. membranacea n. sp. 
