EAELY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 



97 



ANOLOTICHIA IMPOLITA (Ulrich). 

 Plate 7, fig. 11; text figs. 32, 33. 



Crepipora impolita Ulrich, Fourteenth Ann. Rep. Geol. Nat. Hist. Surv. Minne- 

 sota, 1886, p. 77. 



Anolotichia impolita Ulrich, Geol. and Nat. Hist. Snrv. Minnesota, vol. 3, pt. 1, 

 1893, p. 327, pi. 28, figs. 15-20; Zittel's Textbook of Paleontology (Eng. ed.), 

 1896, p. 268, fig. 437 A-C— Sardeson, Journ. Geol., vol. 9, 1901, p. 13, pi. A, 

 fig. 12. 



In the collections made by Prof. Schuchert from the Kuckers 

 shale, on Baron Toll's estate, are five small, ramose brjozoans which 

 have all of the characters of young specimens of the abundant 

 American form Anolotichia impolita. The only differences I can 

 point out in the Russian specimens are, first, a sHght decrease in the 

 size of the zooecia; second, a slightly obliquely directed lunarium; and, 



Fig. 32.— Anolotichlv impolita. a and b, surface of a well-pseserved example, x9, and X18; c, 



SMALL PORTION OF A TANGENTIAL SECTION, X 18, SHOWING LUNAELA AND TUB ULI; d, VERTICAL SECTION, X9. 

 STICTOPORELLA BED OF BLACK RiVER (DeCORAH) SHALES, ST. PAUL, MINNESOTA. (AFTER ULRICH.) 



third, a less polygonally outlined zooecium. However, as all of these 

 specimens have a very narrow, mature region, and the zoarium itself 

 is small, there is little doubt that they are only young stages of a 

 species growing into more robust branches. Almost all of the 

 American specimens of AnoloticJiia impolita are of heavy, full-grown 

 zoaria, but a few examples before me show the j^outhful condition. 

 After carefully comparing these and the Russian specimens, I am 

 convinced that more mature fragments of the latter could not be 

 distinguished even as a variety from the American species. Both the 

 American and Russian examples are illustrated here, and comparisons 

 of figures 32 and 33 will show their identity of structure, 

 Ulrich's description of the species is as follows: 



Zoarium large, bushy, consisting of abundantly and irregularly divided solid 

 branches, the latter varying from 5 to over 20 mm. in diameter. At the base the 

 branches may coalesce, and here they are always stronger than at their terminations. 

 Rarely the zoarium is not branched, but occurs as an irregular mass with lobe-like 



