NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
741 
Entalophora rugosa Waters, 1879. Recent. 
1 dmonea radicata Kirkpatrick, 1888. Recent. 
T ubulipora pulcherrima Kirkpatrick, 1890. Recent. 
Tubulipora cassiformis Harmer, 1915. Recent. 
Proboscina expansa Hincks, 1880. Recent. 
Diastopora cristata MacGillivray, 1886. Recent. 
Proboscina johnstoni Hincks, 1880. Recent. 
Alecto dilatans , Busk, 1850. Pliocene-Recent. 
Entalophora palmata Busk, 1852. Mioeene-Pliocene. 
Diastopora fiabellum Reuss, 1847. Helvetian-Tortonia. 
Berenicea papillosa Reuss, 1847. Cretaceous. 
Berenicea congesta Reuss, 1846. Cretaceous. 
Entalophora echinata Romer, 1840. Cretaceous. 
Berenicea polystoma Romer, 1839. Cretaceous. 
Discosparsa various Ulrich, 1901. Upper Cretaceous-Eocene. 
All our American species form a perfectly homogeneous group; their oecio- 
stome is always transversely elliptical, adjacent to a tube and directed down- 
ward. This function of the escapement of the larva appears most important and 
sufficient to justify the formation of different genera. 
DIAPEROECIA VARIANS Ulrich, 1901. 
Plate 104, figs. 1-4. 
1901. Discosparsa varians Ulrich, Maryland Geological Survey, Eocene, p. 205, pi. 59, fig. 3. 
Description.-— The zoarium is discoidal or tubular; it incrusts algae or sur- 
rounds their small fronds. The tubes are indistinct, arranged in quincunx; the 
peristomes are salient, orbicular, very close to one another. The ovicell is smooth, 
nonglobular, traversed by the tubes; the oeciostome is transverse, elliptical, placed 
in the vicinity of a tube. 
Affinities. — This species appears to have some relations with the group of 
Cellulipora D’Orbigny, 1852. Unfortunately, that genus is still insufficiently 
studied. On the other hand, on account of the form and arrangement of its 
oeciostome, this species will serve later as genotype for a new genus when analo- 
gous species have been discovered. 
Occurrence. — -Lowest Eocene (Bryozoan bed at base of the Aquia formation) : 
Upper Marlboro, Maryland (rare). 
Geological distribution. — Cretaceous (Vincentown [Danian] ) Vincentown, 
New Jersey (Ulrich). 
Plesiotypes. — Cat. No. 65456, U.S.N.M. 
DIAPEROECIA LONGICAUDA, new species. 
Plate 115, figs. 7, S. 
Description.- — The zoarium incrusts bryozoa; it spreads out flabelliform at the 
extremity of uniserial, long branches. The tubes are visible, convex, cylindrical, 
