NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
751 
Measurements- 
Diameter of the peristome 0.20-0.24 mm. 
Diameter of the apertura 0.12 mm. 
Distance between the peristomes 1.20 mm. 
Width of the -segments of the base 0.26 mm. 
This species is not as rare as the preceding one, for we possess a score of 
fragments which has permitted us to make longitudinal sections. The tubes are 
arranged as in Filisparsa. We have supposed that these are the branches of the 
base of a Crisulipora , but the discovery of other segments is necessary. - 
D’Orbigny named this special arrangement of the biserial zoaria, Unicrisia. 
0 ccurrence. — Vicksburgian (Marianna limestone) : Murder Creek east of C-as- 
tlebury, Conecuh County, Alabama (rare) ; west bank Conecuh River, Escambia 
County, Alabama (common). 
Cotypes. — Cat. No. 65460, U.S.N.M. 
DESMED1APEROECIA, new genus. 
The ovicell surrounds the fascicles. The surface of the tubes is ornamented 
with large pores closed by a calcareous lamella. 
B *7 
Fig. 243. — Desmediaperoecia,, new genus. 
A, B. Zoarium natural size and a portion, X 7, of Desmediaperoecia ( Tubulipora ) bidupli- 
cata Waters, 1887. C. Portion of zoarium, X 7, of Desmediaperoecia ( Tubulipora ) campi- 
clieana Waters, 1887 (not D’Orbigny). 
Genotype. — Desmediaperoecia ( Tubulipora ) camjncheana Waters, 1887. Mio- 
cene. Another species referred to this genus is Desmediaperoecia {Tubulipora) 
biduplicata Waters, 1887. 
We have not observed the species mentioned by Waters, 1887, in the Tertiary 
of New Zealand. He figured the ovicell well, but did not speak of the oeciostome. 
It may be. therefore, that this genus would be more correctly classified in the 
Tubuliporidae. 
