No. 1797. 



NEW TUBULIPOROID BRYOZOA—BASSLER. 



507 



Stomatopora tenuissima Ulrich, Journ. Cincinnati Soc. Nat. Hist., vol. 12, 1890, 

 p. 175, fig. 2; Geol. and Nat. Hist. Surv. Minnesota, Final Rep., vol. 3, pt. 1, 

 1893, p. 116, pi. 1, figs. 16, 17. 



Stomatopora delicatula-tenuissima Nickles and Bassler, Bull. U. S. Geol. Surv., 

 no. 173, 1900, p. 419. 



Fig. 5.— Cortnotrypa delicatula. a, view of an authentic specimem of the typical form 

 X12, incrusting a ramose bryozoan. Ordovician, Economy beds of Eden formation, Cin- 

 cinnati, Ohio; 6, part of a zoarium, X12, growing upon the epitheca of an explanate 

 BRYOZOAN. Ordovician, Ottosee shale, Knoxville, Tennessee. 



Original descrijition. — ■ 

 "Polyzoary creeping, ad- 

 nate, branching dicho- 

 tomoiisly, and sometimes 

 anastomosing. Branches 

 linear, about one-tenth of 

 a line in diameter. Cells 

 uniserial, each growing by 

 a pointed base from the 

 cell below, and expanding 

 gradually to the mouth; 

 two or three cells in the 

 space of a line. Apertures 

 terminal, elevated, and 

 nearly or quite the diame- 

 ter of the cells and placed 

 on their front face." 



To James's original de- 

 scription the following re- 

 marks may be added. 

 Strictly speaking, the 

 zooecia do not gradually 

 expand from a pointed 

 base, but, as indicated in the several sets of figures illustrating 

 this species, the slender part of the zooecium, here styled the 



Fig. 6.— Corynotrypa delicatula, a and &, the type- 

 specimen OF Stomatopora tenuissima, X9 and X25. 

 Ordovician, Economy beds of Eden formation, Cin- 

 cinnati, Ohio. (After Ulrich.) 



