36 BRYOZOAN FAUNA OF THE ROCHESTER SHALE. 
Zoarium inerusting, species of Atrypa being selected most often, but other brachiopods] 
bryozoa, or trilobite tests also observed to have been grown upon by this species. These 
incrustations are generally thin and seldom consist of more than two superposed layers, each 
averaging 0.6 mm. in thickness. Surface smooth, maculae inconspicuous. Zooecia polyg- 
onal, 7 in 2 mm., with thin walls. Mesopores usually few, seldom numerous enough to isolate 
the zooecia. Internally as well as externally the most striking feature is the crowded row 
of small granules or aeanthopores which occupy the zooecial wall. These are particularly 
well shown in tangential section but are also generally to be seen at the surface. Acantho- 
pores of the size and shape usually seen in species of Lioclema seem to be entirely absent. 
Occurrence. — Rochester shale, Lockport and other localities in New York. Rare in the 
Osgood beds at Osgood, Ind. 
Catalogue number, 35770, U. S. National Museum. 
Genus LIOCLEMELLA Foerste. 
Zooecia] structure much as in Lioclema but the zoarium consists of cylindrical, fusiform or 
branched stems pointed at the base for articulation. 
LlOCLEMELLA MACCOMBI II. sp. 
PI. XI. ags. 7 10; PI. XXV. Bgs. 5-7. 
Zoarium of slender, smooth, unbranched, cylindrical stems, 1.5 to 2 mm. in diameter and 
reaching a length of 30 mm., pointed at the proximal end for articulation with a base i 
attached to foreign objects. Short examples are thickest and rounded at the distal extrem- 
ity while long specimens have their greatest diameter about the middle and taper gradually 
toward each end. Zooecia thin walled, angular,!') in 2 nun. Mesopores variable in number, 
generally small and few, hut sometimes so numerous as to isolate the zooecia. Well-pre- 
served mature specimens exhibit small, but well-marked aeanthopores occupying the junc- 
tion angles of the zooecia. Vertical sections show that the zooecial tulx's proceed to the 
surface in a gentle curve and that the diaphragms seem to he restricted to the axial region, 
where they vary from one-halt' to two tube diameters in distance from each other. In the 
mesopores the diaphragms are about their own diameter apart. Tangential sections 
exhibit the small aeanthopores occupying the junction angles. 
Compared with described species of LioclemeUa, L. maccombi resembles, especially in mode 
of growth, L.fusiformis (Whitfield) and /.. subfusiformis (James) from the Richmond forma- j 
tion, and L. ohioensis (Foerste), a Clinton species, but differs from each in having decidedly : 
larger zooecia and few mesopores. When complete, the shape of the zoarium distinguishes 
this species from associated forms, but small fragments sometimes bear a great resemblance 
to similar specimens of Eridotrypa striata ( I [all). The latter species, however, branches fre- jj 
quently and fragments usually show a bifurcation, while the zooecia also are usually quite I 
elongate. Fragments of L. maccombi do not branch, usually taper slightly, and have thin- 
walled polygonal zooecia. 
This tine species is named in honor of Mr. George T. McComb, of Lockport, N. Y., wh< 
by collections has generously aided the writer in making this paper as complete as possihle 
Occurrence. — Not uncommon in the washings and on slabs from the Rochester shale a 
Lockport, Lewiston, and Niagara Falls, N. Y., and Grimsby and Hamilton, Ontario. Ran 
in the Osgood beds at Osgood, Ind. 
Catalogue numbers, 35535, 3.5536, U. S. National Museum. 
