ee 
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272 Cincinnati Society of Natural History. 
occupying the maculee, and intertubular spaces are decidedly smaller. 
Fourth, the true zoccia have a diameter of ,1,th of an inch, while those 
of CO florida, and C. limitaris, measure respectively =+,th and 545th of an 
inch. Fifth, the number of stars on the surface of both C. florida, and 
C. limitaris, in the space of one half inch square, never exceeds thirty- 
six, being, furthermore, usually about twenty-five, and in the var. 
prominens, as few as sixteen. On the other hand, those of C. fischerd, 
I have observed to reach the number of one hundred and thirty in the 
game space. This large number is sometimes reduced to fifty or sixty, 
but usually to about eighty. Lastly, C. fisheri agrees with C. florida, 
and differs from C. limitaris, in the absence of diaphragms in the 
axial region of the zoarium, while it differs from the former, and agrees 
with the latter, in having these structures more numerous in the 
peripheral portion of the true zocecia, _ 
The specific name is given in honor of Prof. Moritz Fischer, to whose 
generosity I am indebted for the opportunity of describing this inter- 
esting form. | 
Formation and locality: Cincinnati group. The specimens upon 
which the species is founded, were collected near Mt. Sterling, Ky. 
Judging from the associated fossils, I regard the strata as equivalent 
to those exposed at Cincinnati, O., at an elevation of from 300 to 400 
feet above low water mark in the Ohio river. 
The family relations of the following three genera are uncertain. 
Each presents one or more characters in which it differs more or less 
decidedly from all of the established families of the bryozoa, while at 
the same time they differ quite as strongly from each other. Believing 
it unwise to propose at this time new families for their reception, 
which, it is not improbable the discovery of congeneric forms might 
prove to have been unnecessary, I think it will be best, under the cir- 
cumstances, to refer them, provisionally, to the families to which they 
appear to offer the greatest affinity. Thus, Zdiotrypa may be placed 
with the Monticuliporide, Anisotrypa with the Rhabdomesontide 
(Vine), and Heliotrypa with the Stictoporide. 
IpIoTRYPA, n. gen. 
Zoaria parasitically adhering to foreign objects. Cells of two kinds, the 
true zowcia being sub-circular, with a slightly elevated, thin peristome, 
and more or less completely separated from each other bya series of large, 
angular interstitial cells, The two sets of cells are not distinguishable 
= 
