216 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



Order PHYLACTOL^^MATA. 



Family FREDKKICELLID.E. 



Lophophorc nearly circular; .stato blasts without peripheral float. 



FREDERICELLA Gervais. 



Stock branched in form of antlers; more rarely massed witli recum- 

 bent and elevated tubes; mostl}^ brown or incrusted with algte and 

 grains of sand; rarelj^ hyaline. Tubes cylindrical, the older ones 

 mostly keeled. Without complete dissepiments. Apertures terminal 

 at the broadened or bifid ends of tubes. Polypide very long and 

 slender; tentacles arranged in a nearly circular corona. Few tentacles, 

 not exceeding 24. Statoblasts dark brown, bean-shaped oi* elliptical, 

 without float, and with smooth upper surface. 



FREDERICELLA SULTANA Blumenbach (1777). 



Fredericella walcottu Hyatt (1868) . 

 Fredericelki jjulcherrima Hyatt (1868). 

 Fredericella reginti Leidy. ■ 



This species has the characters of the genus, (Plate V, fig. 4). 



Ilahitat. — On wood, stones, and w^ater plants in standing and slowl}'^ 

 flowing waters. 



Distribtition. — Europe; Australia; Pennisewassee Pond, Norwaj^, 

 Maine; Youngs Brook, Gorham, Maine (Hyatt, 1868); Lake Sebago, 

 Maine (Hj^att); Fresh Pond, Cambridge, Massachusetts (Hyatt); 

 Georgetown, Massachusetts (Hj^att);* Lily Pond, Newport (Leidy); 

 Schujdkill River and Delaware River near Philadelphia (Leidy); 

 Gwinns Falls, Baltimore, Maryland (Hyatt); * Middle Ground, 

 Traverse Bay, Lake Michigan, 23 to 36 meters (Ward, 1896); * Hatch- 

 ery Harbor, Put-in Bay, 1899; *East Harbor, Sandusky, Ohio, 1899; 

 *Erie, Penns} Ivania, Boat Landing; * Illinois River at Havana, Illi- 

 nois, Station G (Thompsons Lake) 1891; *Lake Geneva, Wisconsin, 

 off Long Point, JuW, 1891 (Forbes); *Lake Geneva, dredging from 

 Forest Glen to Belvidere, May, 1892 (Forbes); * Flathead Lake, 

 Yellowstone National Park, August, 1891 (Forbes). 



PLUMATELLA Laniarck (Kraepelin). 



Colonies consist of cylindrical tubes, which are either branched or 

 form massive clumps or run over the substratum as hyaline, lobed 

 tubes. Partitions rudimentary or absent, cuticula brown to hyaline, 

 often incrusted. Tentacular corona markedly horseshoe shaped, with 

 40 to 60 tentacles. Intertentacular membrane present. Statoblasts 



