EARLY TERTIAEY CHEILOSTOME BRYOZOA. 23 



Family SCRUPOCELLARIIDAE Levinsen, 1909. 



The zooecia have large opesia. A gymnocyst and a cryptocyst more 

 or less developed. The mural rim bears distally one or two pairs of 

 spines and laterally a membraneous scutum. The distal wall, consist- 

 ing of a horizontal basal and an obliquely ascending frontal part, 

 has usually numerous, small, scattered, uniporous septulae basally, 

 while the distal half of each lateral wall has one multiporous septula. 

 Besides dependent avicularia, found in most species, vibracula may 

 also occur on the basal surface of the zoarium, and these are connected 

 with the zoarium by an independent wall. The ovicells are generally 

 hyperstomial. As a rule, radicular fibers occur, sometimes springing 

 from a septula (or a dietella), sometimes from a separate chamber 

 connected with a vibraculum. The zoaria are always free, much 

 branched, most frequently with uni- or few seried zooecia, generally 

 consisting of a single laj'er and in most cases jointed by means of 

 chitinous transverse belts. (After Levinsen, 1909.) 



American Tertiary specimens are rare, small, and very fragile, and 

 as a result we have been unable to make any detailed studies of the 

 family. The principal genera of this family are : 



Cdberea Lamouroux, 1816. Vicksburgian-Recent. 



Caheriella Levinsen, 1909. Recent. 



Canda Lamouroux, 1816. Recent. 



Scrujyocellarla Van Beneden, 1844. Lutecian-Recent. 



Bugulopsis Verril, 1879. Recent. 



Hoplitella Levinsen, 1909. Recent. 



RJiahdozoum Hincks, 1882. Recent. 



Menipea Lamouroux, 1816. Recent. 

 The two genera Cohered and Scnipocellar'ia alone are represented 

 in the American collections studied. Canda and Scrupocellaria are 

 very similar. Levinsen distinguishes these genera by their ovicells 

 and Waters by their articulation. Ks the method of articulation and 

 ovicells are not preserved in the fossil forms studied, we can employ 

 but the single genus, Scrupocellaria of which S. elliptica Reuss, 1869, 

 S. gracilis Reuss, 1869, and nine new species have been recognized in 

 American strata. 



Family FARCIMINARIIDAE Busk, 1852. 



The zocecia are furnished with an obliquely ascending distal wall 

 and separated by common, lateral walls which are furnished with 

 a small number (two to four) of uniporous septulae; no true spines. 

 The avicularia dependent, sometimes depressed, sometimes strongly 

 projecting. The ovicells are endozooecial. The zoaria are dichoto- 

 mously branched tufts, with slender, prismatic, sometimes jointed 



