Measurements- 



840 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



POLYASCOSOECIA IMBRICATA, new species. 



Plate 141, figs. 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 mm. 



Maximum width of the zoarium 1.6 mm. 



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 jack/Monica 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, fitudes sur les Ovicelles des Bryozoaires Cyclostomes (2), 

 Bulletin Soci6te G6ologique de France, ser. 4, vol. 17, p. 347. 



The tubes are club-shaped. The mesopores have no vesicular walls. 



Genotype. Pcerascosoeda (Cavea) costata D'Orbigny, 1851. 



Range. Cenomanian-Midwayan. 



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 conximiJis GREGORY, Catalogue Fossil Bryozoa in Department Geology 



British Museum Cretaceous, vol. 2, p. 320. 



Description. The zoarium is hollow (Cava/rio.), 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 



