840 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
POLYASCOSOECIA IMBRICATA, new species. 
Plate 141, tigs. 28-33. 
Description . — The zoarium is free, bifurcated, or arborescent, with triangular 
section. The fascicles are little salient, formed of three or four tubes and arranged 
alternately on each side of the median crest to which they are almost adjacent. 
The tubes are invisible and hidden by two or three vacuoles. The peristome is 
quadrangular and more salient in its proximal portion. On the dorsal the longi- 
tudinal sulci are little deep. The vacuoles are funnel-shaped and close together. 
Distance between the fascicles 0.25 mm. 
Width of the fascicles 0.25 mm. 
Diameter of the tubes 0.20 nun. 
Maximum width of the zoarium 1.6 nun. 
M easurernen ts - 
Affinities. — This species is characterized by the special arrangement of the 
fascicles which appear imbricated one above the other, on account of the saliency 
of the proximal portion of the peristome. 
It differs from Polyascosoecia jacksonica in its wider tubes (0.20 and not 0.12 
mm.) and in its large vacuoles. 
Occurrence. — Lower Jacksonian (Moodys marl) : Jackson, Mississippi (rare). 
Cotypes . — Cat. No. 65342, U.S.N.M. 
Genus PARASCOSOECIA Canu, 1919. 
1919. Parascosoecia Canu, Etudes sur les Ovicelles des Bryozoaires Cyelostoiues (2), 
Bulletin Societe Geologique de France, ser. 4, vol. 17, p. 347. 
The tubes are club-shaped. The mesopores have no vesicular walls. 
Genotype. — Parascosoecia ( Coivea ) costata D’Orbigny, 1851. 
Range. — Cenomanian-Miclwayan. 
The form Petalopora is characterized by the very great regularity in the 
arrangement of the mesopores. The latter are of equal length in Sparsicavea. 
Finally, the hollow forms have been termed Cavaria. But all those forms are again 
found equally in the other families with mesopores. 
PARASCOSOECIA CONSIMILIS Ulrich, 1882. 
Plate 110, figs. 6-15. 
1882. Heteropora consimilis Ulrich, American Paleozoic Bryozoa, Journal Cincinnati 
Society Natural History, vol. 5. p. 144, pi. 6, fig. 11. 
1909. Petalopora consimilis Gregory, Catalogue Fossil Bryozoa in Department Geology 
British Museum Cretaceous, vol. 2, p. 320. 
Description. — The zoarium is hollow (Cavaria), cylindrical, dichotomous, 
arborescent. The tubes are short, club-shaped at first, cylindrical and convex at 
right angles at their extremities (in section) ; the peristomes are orbicular, very 
