18 BRYOZOAN FAUNA OF THE ROCHESTER SHALE. 
of the species is of slender ramulets, showing only two or three rows of zooecia. Second, 
specimens of the variety very commonly exhibit a distinct pore in front of each zooecial 
aperture, while in the species itself this pore is rarely seen. 
Vine probably had this variety in mind when he identified his Spiropora regularis « as 
occurring at Lockport, N. Y. However, D. sparsum and variety argutum differ decidedly 
from Spiropora regularis in that the latter has considerably larger zooecia. 
Occurrence. — Not uncommon at Lockport, N. Y. 
Catalogue number, 35557, U. S. National Museum. 
Genus MITOCLEMA Ulrich. 
Mitoclema Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, 1882, p. 150. 
Compare Clonopora Hall, Nat. Hist. New York, Pal. VI, 1886, p. 2. r >, and Entalophora Lamouroux 
Exp. meth. des genres de pol., 1821, p. 81. 
Ramose Cyclostomata composed of long tubular zooec ia diverging from an imaginary 
axis in all directions to the surface, where they bend outward, and often become free and 
much produced. Apertures circular, usually arranged in regular transverse or subspiral 
series. 
As to the advisability of referring the following new species to the Ordovician genus 
Mitoclema or to the very similar Clonopora, founded upon Devonian forms, the writer is still 
in doubt. Both of these genera may eventually prove to be synonyms of the recent genus 
Entalophora. Undoubted specie's of Stomatopora and Berenicea are found in most of the 
formations from Ordovician to recent times, and it is not at all unlikely that Entalophora 
will also prove to be one of these long-enduring simple cyclostomatoua generic types. 
Mitoclema sarlei n. sp. 
Ii. V, figs. 10 -12. 
Zoarium of very small, slender, ramose, cylindrical branches 0.35 to 0.45 mm. in diam- 
eter. Zooecia long, tubular, with circular apertures about 0.1 mm. in diameter projecting 
upward and outward from the body of the stem. Measuring longitudinally, there are 
about three zocecia in 2 mm. The space between the zooecial apertures is generally 
smooth, but sometimes exhibits faint transverse wrinkles. 
All of t he specimens of this species so far observed are attached to slabs, but these indicate 
that each branchlet bears four longitudinal rows of zooecia whose apertures are so placed 
that a somewhat regular ascending spiral series is the result. In the number of zooecia, 
M . sarlei is different from all of the described species of the genus, no other form having so 
few rows of apertures. 
This neat species is named in honor of Mr. Clifton J. Sarle, of Rochester, N. Y., who 
kindly collected a considerable number of bryozoa at that place for the writer. 
Occurrence. — Common on the thin slabs of limestone in the Rochester shale at Rochester, 
N. Y. 
Catalogue number, 35460, U. S. National Museum. 
IParrxily CERAMOPORIDJE TJlricli. 
Genus CERAMOPORA Hall. 
In 1890 Ulrich *> restricted the genus Ceramopora to the type species, C. imbricata, making 
the peculiar, spongy, basal tissue in connection with the indefinite wall structure, large 
openings in the walls, and absence of diaphragms, the characteristic features. Since that 
time other undoubted species of Ceramopora have been discovered which show that the 
more important characters of the genus are the indefinite wall structure of both zooeciii and 
mesopores and the large openings in the walls allowing neighboring tubes to communicate 
a Quart. Jour. Geol. Soc. London, XXVIII, 1882, p. 56, figs. 4-6. 
b Geol. Survey Illinois, VIII, 1890, p. 493. 
