NIAGARA GROUP. 117 
departures from these characters, due perhaps to accidental causes, which present almost specific 
differences. 
Fig. 1 a. A single cell with a lateral bud on one side. The weathered portion near the top of 
the specimen shows very distinctly the transverse dissepiments. 
Fig. 1A. A specimen cut-obliquely, showing the transverse dissepiments in the inner circle of 
the cell. 
Fig. 1 c. A group formed by budding from a single stock below. One of the buds is broken off 
near the base. The exterior surface is well preserved in this specimen, showing the 
fine transverse strite. The outer circle is distinctly cellular from above, while the 
centre is solid. The base of this specimen is covered by an incrusting coral. 
Fig. 1 d. A small group, showing one mode of budding. The continuation of the righthand 
portion of the figure has been broken off. 
Fig. 1 e. A cylindrical specimen, contracted at intervals from intermitted growth, and showing 
a tendency to budding at these points. On the lefthand side, at a, a, are two buds 
broken off; and on the righthand side, at b, b, b, are the germs of three other buds 
which have not expanded. 
Fig. 1 /. A portion of fig. 1 a enlarged, showing the transverse dissepiments uniting the lamellas. 
Fig. 1 g, h. The cell natural size and enlarged, showing the denticulated appearance of the la¬ 
mellae, arising from the dissepiments being partially preserved at the junction with 
the lamellae. The inner and outer portions of the cell are distinctly shown. 
Fig. 1 i. A vertical section of the cell. 
Fig. 1 A;. A fragment showing the ends of several stems standing out above the weathered surface, 
having the exterior portion still cellular, while in many of them the centre is solid. 
Fig. 1 A. A polished section of a less crystalline specimen, showing the ends of several stems. 
Fig. 1 m. A part of a larger group, showing the manner of budding and increase. 
Fig. 1 n. A single stem with two buds in the lower part, which are broken off near the stock; 
while near the upper part the buds are numerous, and thrown out on all sides. The 
surface of the specimen is somewhat worn, showing the lamellar structure of the 
outer circle, while the transverse septa are obliterated. 
Fig. 1 o. A longitudinal section of several stems, showing the transverse dissepiments, which, 
near the ba^e of one stem are bent downwards in the middle, and are otherwise 
irregular in other parts of the stem. 
Fig. 1 p, r. Longitudinal sections from two different groups, showing irregularity in the trans¬ 
verse septa of the centre of the cell. 
Position and locality. This coral is quite abundant in weathered specimens of the lower 
part of the limestone of the Niagara group at Lockport, but is rare in other places in New- 
York. ( State Collection.) 
