16 BRYOZOAN FAUNA OF THE ROCHESTER SHALE. 
wide a distribution as the accompanying Cyclostomata, Stomatopora elongata Vine, and 
Berenicea consimilis (Lonsdale). As indicated in the above synonymy, the American form 
was figured by Hall in 1852 without a specific designation, and later was figured and de- 
scribed by Ringueberg as Stomatopora recta. 
The zoarium of S. dissimilis is parasitic, other bryozoa, brachiopods, and crinoid columns 
or plates being usually selected; uniserial, with lateral series branching usually irregularly 
but sometimes very regularly and at right angles to the main series. Zooecia subcylindrical 
or club shaped, about 0.10 mm. in diameter at the proximal end and increasing to 0.35 ram. 
at the rounded distal portion; an average zooeciura is 1.15 mm. in length with 5 to 6 in 5 mm. 
Apertures large, subterminal, bounded by a raised rim-like border. Zooecia marked trans- 
versely by fine wrinkles or striations. 
The large zooecia with their transverse striations or wrinkles particularly characterize S. 
dissimilis and serve to distinguish it from all other Paleozoic species of the genus. 
Occurrence. — Vine's types are from the Buildwas beds of the Wenlock shales, Shropshire, 
England. The species occurs also in the Silurian beds on the island of (lot land; in the 
Rochester shale at Rochester, Lockport , Middleport, Niagara Falls, and other localities in 
western .New York; in the same shale at Grimsby, Ontario; and in the Osgood beds at 
Osgood, Ind. 
Catalogue numbers, 35172, 35473, 44112, 44113, U. S. National Museum. 
Genus BERENICEA I 
jamouroux. 
The adnate zoarium of thin, discoid, flabellate or irregular crusts with tubular zooecia 
arranged in irregularly alternating lines distinguishes this genus from other members of 
the Diastoporidse. 
Berenicea consimilis (Lonsdale). 
PI. V, figs. 1-5. 
Aulopora consimilis Lonsdale, in Murchison's Sil. System, pt. 2, 1839, p. 075, pi. 15. 
Diastopora (Aulopora) consimilis Vine, British Assoc. Kept., 1881. 
Diastopora consimilis Nine, <^uart. Jour. Geol. Soc. London, XXXVIII, 1882, p. 58. 
Diastoporella consimilis Vino, British Assoc. Rept., Foss. Polyzoa, IV, 1883. 
Diastoporella consimilis Vino, Proc. Yorkshire Geol. and Polytech. Soc, IX, 1887, p. 190, pi. 12, figs. 
18-20. 
— Hall, Nat. Hist. New York, Pal. II, 1852, p. 173, pi. 40E, figs. 8a, b. 
Sagenella elegnus Hall, Twenty-eighth Ann. Rept. New York State Mus. (doc. ed.), 1870, pi. 7, figs. 12, 
13; ibid. (Mus. ed.), 1879, p. 118 pi. 7, figs. 12, 13. 
Sagenella elegans Hall, Eleventh Ann. Rept. Indiana Geol. Nat. Hist., 1882, p. 242, pi. 0, figs. 12, 13. 
Sagenella elegans Simpson, Fourteenth Ann. Kept. State Geol. New York for the year 1894, 1897, pi. 20, 
fig. 4. 
Berenicea elegans Nicklos and Bassler, Bull. U. S. Geol. Survey No. 173, 1900, p. 181. 
Sagenella membranacea Hall, Nat. Hist. New York, Pal. IT, 1852, p. 172, pi. 40E, fig. 6a, b. 
Berenicea membranacea Nickles and Bassler, Bull. U. S. Geol. Survey No. 173. 1900, p. 181. 
A study of many specimens from various Silurian localities in Europe and America has 
shown that the species first described by Lonsdale as Aulopora consimilis is a cosmopolitan 
form ranging throughout several formations but eminently characteristic of the Silurian 
rocks as a whole. Lonsdale's description and figures are complete enough for the deter- 
mination of the form, but the species is more accurately defined in the later work of Vine. 
A comparison of the types of Sagenella elegans and S. membranacea with specimens from 
England and Gotland indicates that all represent the same species. Sagenella membranacea 
is founded upon a worn example from the Rochester shale, while the type of S. elegans from 
the Waldron beds is a normal specimen growing upon a pelecvpod. 
Lonsdale's original description is as follows: 
Aulopora consimilis sp. n., Lons. pi. 15, f. 7, magnified twiee. A. incrusting, tubes round, close together, 
radiated, bifurcated; openings circular, raised; margin thick. This fossil is singularly like Aulopora 
compressa of Goldfuss (Petref., p. 84, Taf. XXXVIII, f. 17), found in the Oolitic scries of Germany. 
