GRAB All: MONILOPORIDAE. 
417 
assumed a triangular form, with a ridge or carination along the 
center, — features eminently characteristic of the next species. 
Regularly developed individuals approach in appearance that of 
small specimens of C.jacksoni (PI. 3, fig. 5), the branches becoming 
smooth and circular in cross-section. 
While the branching is usually irregular, it occasionally becomes 
verticillate (PI. 3, fig. 4), a number of branches being given off at 
the same level. Occasionally, however, the growth is so irregular 
as to produce a conglomerate mass resembling the usual manner of 
growth of Monilopora (PI. 3, fig. 7). 
Internally the corallites remain connected by a pore, usually until 
well advanced in age, when the pore may become closed. This, 
however, may also occur in young individuals, but it is not very 
common. The closing begins by the increase in size and number of 
the trabeculae which fringe the pore, the further effectual separa¬ 
tion being accomplished by the deposition of lamellae of scleren- 
chyma. 
Ontogeny . The young corallite is irregularly conical much 
resembling the initial tube of Aulopora. This resemblance is 
strengthened by the attached character of the young corallite (PI. 
3, figs. 12, 13, the latter separated from the object to which it was 
attached). No trabeculae or cysts have been observed in the young 
individuals below the first bud, but these appear higher up in the 
initial corallite. From the initial tube lateral buds arise, in the 
same manner as in Aulopora, the new corallite retaining, for a time 
at least, its connection with the old one through the mural pore. 
The cysts and trabeculae are well developed in the second corallite. 
Abnormal deformations. Deformations occur in the early stages 
of growth as well as in the later ones. Plate 3, fig. 2, shows a 
'specimen in which the first bud took a downward direction of growth, 
probably through the separation of the initial corallite from its 
object of support. This corallite continued to grow in this abnor¬ 
mal direction, finally growing past and over the initial point of the 
first corallite and coalescing with it. 
Formation and locality. This species occurs in calcareous beds 
of the Hamilton group at Canandaigua Lake, N. Y. Collected by 
Prof. C. E. Beecher. Types in the collection of Yale university 
museum. A number of specimens of this species from the Falls of 
the Ohio, probably from limestones of the Hamilton group, are in 
the collection of the Massachusetts institute of technology. 
