EARLY PALEOZOIC BBYOZOA OP THE BALTIC PEOVINCES, 



65 



stome, is direct, circular, about 0.09 mm. in diameter, and situated 

 near the anterior end. 



Occurrence. — ^The original types came from the Trenton rocks of 

 New York, where the zoarium is of more delicate growth than in the 

 higher formations; but specimens of C. injiata are generally abundant 

 in all of the Middle and Upper Ordovician and earliest Silurian (Rich- 

 mond) formations of North America. Typical examples have been 



/ 



Fig. 10. — CORYNOTRYPA INFLATA. a AND 6, ZOAEIUM, NATURAL SIZE, AND A PORTION, X9; C, THREE ZOCECIA 

 OF SAME, X 18, SHOWING THE POROUS WALL; d, A VERTICAL SECTION OF A ZOCECIUM, X 18. LOWER PORTION 



OP THE Trenton formation at Cannon Falls, Minnesota, e and/, small portion of a colony, 



INCRUSTING RAFINESQUINA ALTERNATA, X9 AND X18; g, OUTLINE OF ZOCECIA, X18, SHOWING THREE 

 "GEMS" SPRINGING FROM ONE PARENT CELL. UPPER ORDOVICIAN (MaYSVILLE), CINCINNATI, OhIO. 



(After Ulrich.) 



found in the Middle Ordovician (Wesenberg) limestone (E), at Wesen- 

 berg, Esthonia, Russia (Cat. No. 57115, U.S.N.M.). 



Numerous specimens from American localities are in the collections 

 of the British Museum. 



CORYNOTRYPA ABRUPTA Bassler. 



Text figs. 11, 12. 



Corynotrypa abrupta Bassler, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 517, text 

 figs. 16, 17. 



Zoarium adnate, consisting of frequently branching, elongated, rather 

 large, clavate zooecia, much swollen at the anterior end. The tubular 



