NORTH AMERICAN EARLY TERTIARY BRYOZOA. 741 



Entalophora rugosa Waters, 1879. Recent. 



Idmonea radicata Kirkpatrick, 1888. Recent. 



Tubulipora pulcherrima Kirkpatrick, 1890. Recent. 



Tubulipora cassiforlnis 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 palmetto. Busk, 1852. Miocene-Plioc'ene. 



Diastopora ftabcUum Reuss, 1847. Helvetian-Tortonia. 



Berenicea papillosa Reuss, 1 847. Cretaceous. 



Berenicea congesta Reuss, 1846. Cretaceous. 



Entalophora echinata Romer, 1840. Cretaceous. 



Berenicea polystoma Romer, 1839. Cretaceous. 



Discosparsa varians 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 rarians 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 wlren 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 [Daman]) Vincentown, 

 New Jersey (Ulrich). 



Plesiotypes.Csit. No. 65456, U.S.N.M. 



DIAPEROECIA LONGICAUDA. new species. 



Plate 115, figs. 7, 8. 



Description. The zoarium incrusts bryozoa; it spreads out flabelliform at the 

 extremity of uniserial, long branches. The tubes are visible, convex, cylindrical, 



