NORTH AMERICAN LATER TERTIARY AND QUATERNARY pRYOZOA. 191 



by very small areolar pores. There are often one or two avicularia in the vicinity 

 of the apertura. On the inner side the zooecia are hexagonal or fusiform, termi- 

 nated by a small orbicular pore or covered with large pores. 



Genotype. — Fedora edwardsi Jullien, 1882. 



Range. — Lutetian to Recent. 



The known species of this genus are as follows: 



Fedora edwardsi Jullien, 1882. Recent (Atlantic). 



Fedora (Stichoporina) simplex Kirkpatrick, 1890 (not Koschinsky, 1885). 

 Recent (Indian Ocean) . 



Fedora ( Mamillopora) smithi Calvet, 1907 (possibly F. persimplex Neviani, 

 1895). Recent (Atlantic). 



Fedora (Discojlustrellaria) dactyhis D'Orbigny, 1852. Lutetian. 



Fedora (Stichoporina) simplex Koschinsky, 1885 ( = Stichoporina reussi Canu, 

 1907). Lutetian. 



Fedora [Stichoporina) protecta Koschinsky, 1885. Lutetian, Jacksonian. 



Fedora (Kionidella) excelsa Koschinsky, 1885. Lutetian, Priabonian. 



Fedora (Stichoporina) crassilairis Koschinsky, 1885. Lutetian. 



Fedora (Cupularia) bidentata Reuss, 1869. (See Waters, 1919.) Priabonian. 



Fedora (Kionidella) ohliqueseriata Koschinsky, 1885. Lutetian. 



Fedora (Stichoporina) persimplex Neviani, 1895. Plaisancian. 



Fedora (Lepralia) minutissima Sequenza, 1880. Helvetian. 



Genus MAMILLOPORA Smitt, 1873. 



1872. Mamillopora Smitt, Floridan Bryozoa, pt. 1, Kongl. Svenska Vetenskaps Akademiena Hand- 

 lingar, vol. 10, no. 11, p. 33. 



Oral aperture large (0.12 mm.), contracted at each side. Primary zooecium 

 erect, surrounded by six similar zooecia. Only unilaminate, showing the position 

 of the zooecia on the under surface. (Waters.) The zoarium is cupuliform. The 

 apertura is elliptical with two submedian cardelles. Avicularia are present. The 

 ovicelled zooecia are much larger; their apertura is not transverse. The zooecia 

 and their inner side are covered with tuberosities. 



Genotype. — Mamillopora cupula Smitt, 1872. 



The genotype of the genus is incompletely known. 



We have had the good fortune to secure some recent specimens of Mamillopora 

 dredged in the Gulf of Mexico. The species appears to be new, but it shows some 

 interesting facts on the structure of the genus. It differs from Mamillopora cupula 

 Smitt, 1872, in having a much smaller and nonbilobed ovicell, in the presence of a 

 peristomial avicularium instead of an interzooecial one, and in having analogous 

 apertures on the ovicelled zooecia. Our specimens were unfortunately insufficient 

 for a complete study, but nevertheless we have observed the following points: 



1. The ovicell is closed by the operculum. The operculum of the ovicelled 

 zooecia is identical with the operculum of the other zooecia but often somewhat 

 higher. 



2. On the inner, noncellular (superior) side each tuberosity is a pyriform avi- 

 cularium in which the opesium, which is elliptical and without pivot, bears a small 

 semielliptical mandible. The mandibles are quite variable in dimensions, as some 

 are small and others are large. 



