made the island famous, the larger number of quarries are sit- 

 uated. Early observers apparently did not make a clear dis- 

 tinction between the Black River rock and the dark strata here 

 found; and possibly a confusion arose as to the exact naming 

 of the early term, Isle La Motte limestone. We, in all proba- 

 bility, may consider the term as the equivalent of B Chazy. 



Certain portions of its two hundred feet of rock abound in 

 well preserved shells of Maclurea magna. In connection with 

 the upper beds carrying this fossil and inclosed within them, 

 are found large variable masses of stone, wavy in structure, 

 light in color, from two to six feet in section. These have been 

 recognized though not approved by the quarrymen. Examples, 

 hand fragments, have been distributed to the museums of the 

 State and known as banded limestone. The stone sawn and 

 polished shows wavy laminae and forms a beautiful marble. 

 The very size seems to have prevented a recognition of its true 

 character. It is really a massive Stromatocerhim. Occasion- 

 ally a block raised from the quarry will be made up largely or 

 even wholly of this fossil. In the upright wall of the quarry, a 

 wrinkled, banded, lighter stone, it appears as a conspicuous 

 object. Sent to the mills blocks containing the fossil have 

 been sawn with other blocks, and wherever in the floors of cor- 

 ridors and public buildings in the eastern cities, the tiling of 

 Isle La Motte marble with its sections of coiled Maclurea ap- 

 pears, there will often appear side by side, sections of this 

 wavy fossil. 



This form stands out by itself so conspicuously that it can- 

 not well be placed with either of the species of Stromatocerium 

 already named, and so should have a specific position of its 

 own. These large examples so far as observed have been found 

 only on this island and may appropriately bear its name. 



Stromatocerium lamottense. n. sp. 



PI. LXIX, PL LXXII, PI. LXXIV, fig-. 1. 



A massive Stromatocerium two to six or more feet in section; 

 variable in form; upper surface usually crenulate; laminae. 



