NORTH AMERICAN EAULY TERTIARY BRYOZOA. 



141 



The following species are classed in this genus: 

 Aldii'iini (Mernbranipora) inilidHs Ilincks, 1860. Recent. 

 Alderina (Membranipora) imf/trf/iris Smitt, 1872. Recent. 

 A/<lcrt/>ii (Membranipora) solidula. Hinclcs, 1860. Recent. 

 ovalis D'Orbigny, 1S52. Sononian. 



.i D'Orbin 1852. Senonian. 



t. Teuclla F. Stamenocella G. Megapora H. Ammatophora I. Marssonopora 



FIG. 35. Genera of Membraniporae with ovicells never closed by the opevcular valve. 



A. Alderina imbellis Hincks, 1880, X 25. Recent. 



B. Callopora lineala Linnaeus, 1758. X 50. Recent. 



C. Amphiblestrum flemingi Busk. 1875, X 50. Recent. 



D. Ramphonotus minax Busk, I860. X 25. Recent. 



E. Tegella unicornis Fleming, 1828, X 20. Recent. 



F. Stnmciwcella pyriformis, new species. X 20. Lower Jacksonian, Jackson, Mississippi. 



G. Alegapora ringens Hincks, 1880, X 50. Recent. 

 H. Ammatophora nodulosa, Hincks, 1880. Recent. 



I. Marssonopora dispersa Hagenow. 18I57. Cretaceous (Senonian) Isle of Riigen. 



Alderina (Membranipora) abortiva Canu, 1911. Rocanean. 



Alderina (Membranipora) cummingsi Canu, 1911. Rocanean. 



Alderina (Membranipora} pcrisparsa Novak, 1877. Cenomanian. 



The recent species Alderina irregularis Smitt. 1872, is very important in the 

 American forms, and as it has been confused with other species we believed it useful 

 to make known its synonymy and history. 



