EAELY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 



63 



that the latter species has much larger zooecia, expandmg more ab- 

 ruptly at the anterior end instead of increasing gradually in size. 

 C. inflata has shorter zooecia and a greater angle of divergence, while 

 G. ahrupta has a still greater rate of expansion. The other Russian 

 species referred to the genus, C. dissimilis and C. schucTierti, are much 

 coarser in every way. 



Occurrence. — The original types were found in the Lower Cincin- 

 natian strata at Cincinnati, Ohio, but the species occurs abundantly 

 in nearly all the divisions of the Stones River and higher Ordovician 

 rocks of North America. It is also well represented in the Richmond 

 formation now assigned to the earliest Silurian. In Russia the known 

 occurrences are as follows: (1) A specimen with rather large zooecia, 

 incrusting a bifoliate bryozoan, in the Wassalem beds (D3) at Uxnorm, 



Fig. 9.— GOEYNOTKYPA BARBERI. 0, PORTION OF THE TYPE-SPECIMEN, X9, INCRUSTING A BIFOLIATE 



bryozoan; 6, several zocecia, x20. Middle Ordovicla.n, Ottosee formation, Knoxville, Ten- 

 nessee; C, PART of a small COLONY, X9, GROWING UPON A SPECIES OF HELIOLITES. EARLY SiLURLAJ^, 

 LYCKHOLM FORMATION, HOHENHOLM, ISLAND OF DAGO, ESTHONLA.. 



near Reval (Cat. No. 57114, U.S.N.M.); (2) a typical example grow- 

 ing upon a fragment of RJiomiopora esthonise, from the Jewe lime- 

 stone (Dl), Baron Toll's estate, near Jewe (Cat. No. 57505, U.S.N.M.); 

 and (3) the impression of an example on the figured specimen of 

 AnoloticTiia sacculus from the Kuckers shale (C2) at the same locality 

 (Cat. No. 57506, U.S.N.M.). 



The collections of the British Museum contain numerous specimens 

 of the species from American localities. 



CORYNOTRYPA BARBERI Bassler. 

 Text fig. 9. 



Corynotrypa barberi Bassler, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 509, text 

 fig. 8. 

 At first sight this species seems to be only an exceptionally large 

 form of Corynotrypa delicatula, but upon closer inspection other dif- 

 ferences may be noted. These are, especially, the rapid swelling of 



