460 



DESCRIPTIONS OF NEW SPECIES OF FOSSILS, ETC. 



Cells tubulai-, nearly at right angles to the axis ; rapidly increasing- in size to the 

 aperture ; apertures arranged in regular longitudinal i-o\vs, which are sometimes sepa- 

 rated by a slight ridge ; from five to nine rows on a branch ; 

 from eight to ten apertures in the space of 5 mm. longitu- 

 dinally; diameter of an aperture from .33 to .40 mm. Lips 

 rii t i i m t ,tn^K r. ^ PS Tr IS39. promineut, in well-preserved specimens, projecting over tlie 

 aperture, and giving to the cell-tubes the appearance of opening very obliquely. 



This species somewhat resembles C. mulUpora, but the branches are smaller and 

 straighter, and the cell apertures are much more regularly arranged in parallel, longi- 

 tudinal rows ; in its size and manner of growth it is very similar to 6'. niacrojjhora, 

 but the surface of that species has not been observed, so no comparisons are possible. 

 Formation and localities. Lower Helderberg group, one and a-half miles south 

 of Rock Hill furnace, Orbisonia, Huntingdon county ; also north of Tyrone Cit}-, 

 Blair county, Pennsylvania. 



HOMALONOTUS TRENTONENSIS, Simpson, n. sp., Fig. 31. 



r ' 





"*\ /•. 



:^mi::i i 



APS. Tt. !2°9. 



'Homa'ofoNs ^ren^onen3(3 



SirTipson. 



The figures represent a few of many si)ecimens in the State Collection, found l)v 

 Mr. C. E. Hall in strata of the Trenton group, cropping out just aljove the milldam 

 at Reedsville, in MiiUin county, Pennsylvania. 



