298 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. . 



ANAPHRA.GMA MIRABILE Ulrich and Bassler. 



Text fig. 183. 



Anaphragma mirabile Ulkich and Bassler, Smiths. Misc. Coll., vol. 47, 1904, p. 

 49, pi. 13, figs. 9-11. 



The discovery of this unusual type in the Russian deposits is a most 

 interesting example of the wide geographic range of the Bryozoa, and 

 of their consequent value in detailed correlation. After a most critical 



Fig. 183.— Anaphragma mirabile. a, vie-w of an irregularly growing branch, natural size; 



6, tangential section, X20; C, SE'VTERAL ZOCECIA of another part of this section, X20, SHOWING 

 NUMEROUS ACANTHOPORES; d, A vertical section, X9, THROUGH THE ENTIRE WIDTH OF THE BRANCH; 

 e, PORTION OF THE SAME SECTION, X20, SHOWING THE STRUCTURE IN MORE DETAIL. LTCKHOLM LIME- 

 STONE (Fl), HOHENHOLM, ISLAND OF DaGO. 



comparison of numerous thin sections of both American and E-ussian 

 specimens of the species, I am unable to point out any differences 

 between them. The figured vertical sections of the type showed no 

 diaphragms in the zooecial tubes, but a restudy of the species in con- 

 nection with the present work brought out the fact that an occasional 

 diaphragm may occur, its place usually being at the bend from the 

 immature to the mature region. The most marked example of such 

 an occurrence is shown in the vertical sections, figures 183 cZ and e. 



