PLATE 42, 43, 44. 
CORAL AND OTHER MARINE REMAINS, 
CHERT f LIMESTONE, AND SPAR. 
P. 42 — FIG. 1, 2. 
ERISMATOLITHUS Tubiporites (catenatus ) aggre- 
gatus, raniis tubulatls lateralibus borizontalibus dis- 
tantibus tubulos suberectos connectentibus. S. p. 
Fossil coral. The original a Tubipora. Aggregate; the 
tubes or stirps equal, parallel, filiforin, generally approxi- 
mate, and nearly erect : each emitting from its sides distant 
horizontal tubular branches which enter the surrounding 
stirps, uniting the whole into one irregularly formed mass 
or group. 
•Now and then met with in the limestone, near JVinster. 
I have also found it at Buxton. It generally constitutes very' 
large masses. The tubes sometimes five or six inches long. 
There are two varieties of this coral : in one the tubes are 
very slender and distant, which gives the mass an open, 
reticulated appearance : in the other the tubes are thicker 
and approximate, forming a closer or more solid group. 
Fig. 1. Is a specimen of the first variety. Chert. 
2. Exhibits a specimen of the other variety. Also cJiert. 
The matrix of both was limestone. 
