No. 1797. 



NEW TUBULIPOROID BR.Y0Z0A—BAS8LEB. 



525 



apply to both. The characters in common are (1) rather hxrge 

 zocecia with a sHght angle of divergence and transversely lined or 

 wrinkled walls, and (2) zooecial 



a 



'^t^^ 



apertures exsert as in Stomato- 

 pora and much larger than in 

 typical Corynotrypa. Compar- 

 ing the two closely, the average 

 zooecium of C. tennesseensis has 

 a length of 0.75 mm. and a 

 width of 0.30 mm. at its great- 

 est diameter, and is therefore 

 of less size than that obtaining 

 in C. dissimilis. 



The proximal constriction is 

 also more pronounced in the 

 older species, so that altogether 

 it may be considered as repre- 

 senting an intermediate stage 

 between the typical sections of 

 Corynotrypa and the divergent group typified by C. dissimilis. 



Occurrence. — Pierce limestone division of the Stones River group, 

 1^ miles south of Murfreesboro, Tennessee. 



Coty pes. —Cat. no. 54177, U.S.N.M. 



CORYNOTRYPA SCHUCHERTI, new species. 



Zoarium frequently branching, uniserial, incrusting, in the case of 

 the type-specimen, an example of Streptelasma. Zooecium compara- 



FlG. 25.— COEYNOTRYPA TENNESSEENSIS. a, THE 

 TYPE-SPECIMEN, X9, WITH A LONGITUDINAL 

 SECTION OF SEVERAL ZOCEIA; 6, SEVERAL ZOCECIA, 

 X20, INCRUSTING A FRAGMENT OF A StROPHO- 

 MENA. OrDOVICIAN, StONES RIVER GROUP, 



Pierce limestone, one-half mile south of 

 Murfreesboro, Tennessee. 



Fig. 26.— Corynotrypa schucherti. a and b, portions of the type-specimen, incrusting a 

 Streptelasma, X9; c, several zocecia of the same, X20. Middle Ordovician, Wesenberq 

 formation, Wesenberg, Esthonia, Russia. 



