﻿ulrich-bassler] revision OF PALEOZOIC BRYOZOA J/ 



Occurrence. — Upper part of the Fairmount beds ol the I -orraine al 

 Cincinnati, Ohio. Common but vertical range limited to less than 

 a foot. 



Cat. No. 43,204, U. S. X. M. 



Family CONSTELLARIID^E Ulrich 



( renus Constellaria Dana 



CONSTELLARIA TERES new species 



(Not figured ) 



This new species is readily distinguished from all described forms 

 of the genus by its uniform method of growth. The zoarium con- 

 sists of rigid subcylindrical to cylindrical solid stems, 5 to 10 mm. 

 in diameter, dividing by bifurcation at intervals of rarely less than 

 50 mm. The maculae are usually but slightly elevated and are a 

 trifle smaller than in such forms as C. Horida, and on account of the 

 regular method of growth often show an arrangement in ascending 

 diagonally intersecting lines. However, when the surface is nearly 

 smooth the maculae often consist of star-shaped centers from the rays 

 of which long rows of mesopores radiate. 



The size and shape of the zocecia are essentially as in C. Horida, 

 but vertical sections show differences in the tabulation of the zocecia. 

 Diaphragms are almost entirely absent in the axial region of C. 

 Horida, but in C. teres they occur at intervals varying from two to 

 three times the tube-diameter. This difference in tabulation applies 

 also to the peripheral region, the diaphragm in C. teres being here 

 again more abundant. 



Figures of a group of specimens belonging to this and the follow- 

 ing species are given on the plate of characteristic fossils of the 

 G ilumbia folio recently issued by the U. S. Geological Survey. 



Occurrence. — The types are from the shales at the top of the P.ighy 

 limestone of the Trenton at Columbia, Tennessee, where the species 

 is very abundant. It also occurs, but in less abundance, in the 

 Catheys limestone. Numerous localities in Tennessee and Ken- 

 tucky, exposing especially the lower of these two horizons, furnish 

 specimens. 



Cat. Nos. 43,205-43,207, U. S. N. M. 



CONSTELLARIA FLORIDA var. EMACIATA new variety 

 (Not figured I 

 This subordinate name is proposed for a very abundant fossil of 

 the Big-by limestone of Tennessee. The form agrees in all essential 



