A New Bryozoan, Homotrypa Basslert. 103, 
ARTICLE IV.—DESCRIPTION OF A NEW BRYO- 
ZOAN, “HOMOTRYPA BASSLERI” n. sp., FROM 
THE WARREN BEDS OF THE LORRAINE GROUP. 
By JOHN M. NICKLES. 
HOMOTRYPA BASSLERI 0. sp. 
Zoarium dwarfish in habit of growth, consisting of flattened, 
branching fronds, which have gradually expanded from 
almost cylindrical stems without increasing any in thickness. 
No specimens showing basal portion or mode of attachment 
have been observed. Branches usually given off in the 
same plane as the frond, oftenest by bifurcation, though they 
are sometimes given off from the side. Examples used in 
preparing this description, none of them complete, vary from 
15 to 32 mm. in height, from 5 to 9 mm. in width, and are 
about 3 mm. in thickness. Surface studded with low, 
rounded monticules, a little over one mm. in diameter, and 
from one to two mm.apart; rarely the monticules are almost 
obsolete. Apertures rather small, 9 or 10 in 2 mm., sub- 
circular or subangular, often a little oblique to the surface; 
on the monticules the apertures, as is commonly the case, are 
a trifle larger than the others. In the axial region the 
zocecia have very thin walls, rather less flexuous and crinkled 
than is the rule in this genus; the zocecia bend rather 
abruptly to the peripheral region, where they have their walls 
much thickened; after making the turn they proceed at right 
angles to the surface in some specimens, in others a little 
obliquely. No diaphragms developed in the axial region and 
but very few in the mature region. Cystiphragms line the 
upper side of the zocecia in a single row in the peripheral 
region, their walls attenuating toward the back, indicating 
that in the living state calcification was more or less incom- 
plete. The arrangement of the layers forming the walls is 
well shown in the enlarged view of a tangential section of a 
single cell, Figure 5, which shows also the appearance of the 
cystiphragms when cut across, and the structure of the 
Jour. Crn. Soc. Nat. HIST., VOL. XX, No. 2. I PRINTED JANUARY 10, 1902. 
