66 
ANNALS NEW YORK ACADEMY OF SCIENCES 
Silicified specimens of Enterolasma strictum are very abundant in the 
New Scotland limestone, but they are not sufficiently well preserved to use 
in grinding, or in cutting sections. Numerous specimens of various sizes 
and ages have been carefully studied. The general manner of development 
is found to agree with that observed in the Ordovicic and Siluric corals. 
The septa unite at the center more distinctly than in any of the preceding 
species. The pseudocolumella thus formed is not exactly solid, but it is 
much more substantial than that found in Enterolasma caliculum. In many 
specimens when looked at from 
the top it appears to be hollow 
or approaching in appearance 
the w T ell-developed inner wall of 
such a species as Hapsiphyllum 
varsoviense. . Another feature 
in which this species differs from 
those discussed in the previous 
chapter is in the manner of 
development of the small tertiary 
septa. In all the geologically 
earlier species the tertiary septa 
(secondary lamellae of Hall) 
arise as low, free ridges between adjacent primary and secondary septa. 
They remain free and unattached to any of the primary or secondary septa 
throughout their development. In Enterolasma strictum a different condi¬ 
tion is found. This condition is mentioned by Hall when he states that the 
alternate septa frequently coalesce with the primary septa, and is clearly 
shown in the sectional Hews of figures 1 and 2. Of these two views figure 
2 is taken just below the base of the cup, while figure 1 is taken farther 
down in the corallite. 
This species was taken by Simpson as the type of his genus Enterolasma. 1 
In the large number of specimens from the New Scotland limestone beds 
examined in the present study only one presented the appearance in the 
figure by Simpson accompanying his generic description of Enterolasma 
and this was a large individual considerably above the average size. The 
specimens examined ranged from 5 mm. to 25 mm. in length, and all, with 
the single exception above noted, agreed with Hall’s description and the 
accompanying figures. All of these specimens, however, were silicified and 
not adapted to be used for either serial or longitudinal sections. Therefore 
instead of taking serial sections from one individual to get the changes in 
1 Bull. 39, N. Y. State Museum, pp. 203-205, 1900. 
